Left For Dead, Vintage Penton Motorcycle in Sad Shape

A subscriber contacted me on this old race bike that his family rescued from a barn and wanted to know if I would be interested in it, lets see what we have and if it can be saved?

[@hpenton]

Hi Mustie: I can steer you toward parts and expertise. John Penton is my uncle. He is still alive. 96 years old! He lives across the street from my mother. Good friend of mine works for KTM and fixes Pentons on the side. He and I built and sold ignition kits for vintage bikes. Sincerely, Holger Penton

[@dd7890]

Listen to this guy mustie and stop cutting on the frame and beating on it with hammer . Penton is a legend and you can find some of his bikes in the AMA motorcycle museum in Ohio. I'm not sure you know what you have there. If you do not restore that bike get it to someone who can. That's just my humble advice.

[@ronhuffman7973]

Hi Holger Happy to hear that your uncle John is still going! Say hello to him for me, and to Jack and Tom as well!

[@hpenton]

@@ronhuffman7973 Will do!! I see Jeff almost daily

[@andrew2366]

Wow a legend still lives, hi from England .

[@andrew2366]

@@dd7890 Sometimes people just don't realise what they have!!!

[@bryansmith5980]

I live near the Penton Family here in Ohio. They were quality bikes. That is a bike worth the time to restore. museum piece

[@CajunGreenMan]

Absolutely!

[@deconteesawyer5758]

Here's your chance.

[@tomadkins2866]

Me too. John was a local celebrity in certain circles around the area. I met him a couple of times, but didn't "know" him to speak of. It's kind of cool seeing one of his bikes show up here. I haven't seen one in many years.

[@bryansmith5980]

@@tomadkins2866 I did not really know John I knew Jeff.

[@romandark1775]

I used "Diesel fuel" and soaked it into my salt crusted 2 stroke 70HP Yahama, soaked it through the water jackets of my outboard motor and it worked a treat, cleared all the salt out eventually . After which, I always flushed my outboard with Diesel, insteat of using "Saltaway" after every outing - a much cheaper option and it worked a treat. Best of luck from Sydney, Australia

[@joemeatball1080]

John Penton is still kicking, he is 96 years old.. amazing back story to someone who hasn’t received the recognition he deserved.

[@heavenlyblue]

I took a motorcycle repair class at a local college back in the mid 1970's - someone with the last name of "Penton" showed up I assume courtesy of the instructor, and we were told he or is family were the owners of the Penton motorcycles. These were good motorcycles back then. He was probably in his 30's in age, and was a very nice person.

[@beakittelscherz5419]

What are the odds

[@rverro8478]

Small world, isn't it ?

[@lloydgreen4091]

Yes--Very Desirable Dirt Bikes in the mid '70s-- If You get that running decent & looking good, should draw a "Pretty Penny" from the Vintage bike crowd.

[@bevanson]

Jack Penton, an enduro legend!

[@dennisbrown2571]

Penton cycles were made in Amherst, Ohio, I believe.

[@2thehook773]

Totally worth fixing. Rare bike and very valuable. I restore Bultaco's and they are very similar.

[@-EC002-]

Now there's a blast from the past, I used to own an ride a 325cc trials Bultaco, great machine, sorry I let it go.

[@keeperofthegood]

With metal rot, the best you will get would be "Museum Grade"; made clean and representative of what it was, but not functional. He is right at the end, the save for this one for a Functioning restore would be a motor that wasn't rotted (or the other side as the rest of the bike wasn't in too bad a state it could go to completing another persons restore).

[@MrJohnnaz]

To bad, he kind of screwed up the barrel, one of the most valuable parts

[@terry374w2]

I always enjoy your Sunday morning videos. This one was really special, I have a running version of that bike sitting in my garage as well as a 1972 125cc Penton. I ride them every couple years as memories of that past. Please try to keep this one alive, there aren’t many left. Hopefully a viewer has an engine they can offer up!!

[@mikeshobbiesandrandomstuff]

I bet you can still fix it I would like to see the inside of that mess for sure. Thanks for having me over bud.

[@bobuilt10]

Was anyone else shouting "take the wrist pin out" to get the jug off in the frame? Love these archialogical digs.

[@tomadkins2866]

I was thinking that at first, but it was obviously seized hard. There's a press made for that, but I doubt Mustie has one.

[@cliffordmarkell40]

John Penton built fish motorcycle in Ohio he was a National Enduro Champion for years and years and years he still holds the cross-country before freeways I used to race against him all the time amazing man

[@silasmarner7586]

Can you use some punctuation? What's a fish motorcycle?

[@jwesty85]

@@silasmarner7586 One that you ride under water 😂.

[@phillipzx3754]

@@silasmarner7586 It's obvious he meant "first" motorcycle. Don't be obtuse.

[@catsbyondrepair]

The old fart is still alive at 96

[@MrTruckerf]

Haha!@@catsbyondrepair

[@hosocat1410]

I raced a 1968 125cc Penton in motocross and Enduro back in 70-72. Great old bikes.

[@simonsmith4722]

Oh Mustie, what a bummer. When the engine case let go, I felt your pain.

[@Averna222]

Haven't finished watching yet but this bike is a perfect example of ridden hard and put away wet.

[@grantmorden2405]

I was thinking the same thing. Lol

[@stevewhyte8476]

Around here we call it JUNK !

[@deconteesawyer5758]

I doubt it was ridden much.

[@charliem989]

Whenever the camera is out of focus, I hear "focus you fock" in my head. Too bad we didn't get to see this one chooch.

[@kevinrice4909]

I can smell the blenbzhal and hear the Wing dinging.. Good little 250

[@grahammcnally4799]

My heart sank right there with yours when the case broke. Love your channel.

[@1pcfred]

It looked rotted all through when it broke. So I don't think there was much there to begin with.

[@topline620]

Magnesium cases are a nightmare on a newer bike never mind one almost 50 years old!!!

[@kevinjustkevin7627]

Yes, The salt must flow. Love it.

[@bobsbarnworkshop]

The Penton 250 was one of the best motocross bikes ever made! It’s legendary!!!!

[@armyretired28]

Dang, That Penton restored is worth $$ of money! I loved Penton's when I raced back in the day!

[@nh5er237]

So how about a link to your KZbin channel. I’m sure you do amazing work.

[@janeames1513]

@Bill not content on your channel and only 1 subscriber? must be a family member but you think you deserve the right to call people a clown? you are obviously new here ...i've been working on cars for over 35 years and already knew the motor was junk b/c it had been flooded by salt water...get some knowledge before you start name calling ...or just keep sitting and being a keyboard mechanic with no basic common sense and get yourself banned from all channels

[@doubled2727]

Why do you need a KZbin channel to make a comment? I guess it's because you didn't like the substance of Bill's comment.

[@billbeyer657]

@@doubled2727 why do you need to keep defending Darren’s detractors? His comment had no substance it was just a wet fart coming from his mouth 🤡

[@elobiretv]

@@janeames1513 lol you don't need a youtube channel to realise using a drift to split cases is stupid.

[@millcrafters]

Mustie, love your channel. Had a high end body shop for twenty years and did state inspections. We had a running joke in the shop that we would charge... for the sake of numbers, $30 per hour if we fix it, $40 per hour if you worked on it before us, and $50 per hour if you watch. :-)

[@sebrandomstuff]

I was living it until you cutted the Frame tab. Then things got worst when you crushed the case. I love your channel but I think this time you screwed it up. Whith patience, time and some chemical dipping it will be loose. You have to be carefull with old fragile irreplaceable stuff. Good experience for the next one.

[@gben7084]

and $75.00 if you helped!!!

[@johnbrizendine7716]

@@sebrandomstuff The magnesium the case was made from was so badly oxidized that it would have either burst into flames if he were to have managed to get all cleaned up and started, or it would have just blown apart in a spectacular shower of shrapnel; either way, better that it broke and kept it from going any further. Magnesium is some crazy stuff, especially once it has started to oxidize. Very lucky it didn't ignite. I would guess it's actually a magnesium/aluminum alloy, or it would have already ignited. Newer laptop frames are made of magnesium and that stuff is fun to play with. Cut shavings of the magnesium off and set fire to them, burns super bright white.

[@blackcatpgh13]

@@johnbrizendine7716 yeah, a magnesium fire isn't a fun time, unless it is on purpose!

[@thomasmorrison3329]

@@johnbrizendine7716 yup; had a bottle cap full of the stuff I "borrowed' from 9th grade science class...I set it on fire in my mother's kitchen; fortunately I didn't burn the house down, but did scorch the Formica countertop, which was hard to explain...

[@ryanross3322]

Well I've found my new favorite KZbinr! I've been watching his past videos all day yesterday and today love it !

[@methods-SE]

Best video I've ever seen. Thank you Brother.

[@brianjacobsen5762]

That's motor cross history you got right there. Love the big radial head.

[@MrBlaser51]

Your perseverance is beyond what most anyone else would attempt. Amazing !!!!

[@EbonyPope]

Amazing? Instead of using a puller to split the case he used a hammer and destroyed the case! That was absolutely moronic. I like his channel but this was an absolutely awful job of his.

[@markellsworth2814]

@@EbonyPope It was already worthless, think you could have saved it and made it run again?

[@jackass72]

I don't think he knows how valuable this bike is. If he did, I'm sure he would've been much gentler and cautious with the teardown.

[@jackass72]

I wouldn't necessarily say it's worthless. Those cases may still be salvageable. That's a collectible bike.

[@marcuscicero9587]

oh absolutely. the patience of Job the man has

[@dpenton]

I am a penton. Unrelated to John. I really love the idea of these old bikes. Looks like you have a mess of one here. Thanks for sharing Mustie1!

[@lmfarms4611]

I like how you never give, you keep coming up with solutions.

[@davidwolff8878]

just finished your video, and looked on EBAY and found many PENTON cases and blocks. just a thought

[@tstuart7333]

I truly admire your approach and efforts. Personally I thought there was just too much corrosion on the engine. Hey! we have all learned a lesson here. Thank you.

[@frank-t6857]

Finally someone who see the damage done to the magnesium crank case and that it's beyond repair. I don't understand the ones here in the comment section that are saying Mustie must restore the engine. Look for a replacement 2 stroke around 250cc and enjoy it for what it is. Maybe someone has an original KTM engine and want to buy the frame from Mustie.

[@jackass72]

That's a collectible bike. Definitely worth saving.

[@Eddie.D346]

@@frank-t6857 ANYTHING can be repaired;it's just a matter of time and money

[@swallowinn4410]

Hello Mustie your so close to having the case apart. The separation in the center is starting to show. On camera the disappointment showed as the case broke away. The broken out area appears to be in a low stress area of the case and I think could be welded to be serviceable. ( My career was in aviation maintenance and we routinely repaired magnesium , aluminum & white metal gearbox cases.) The exfoliation corrosion also frequently looks far worse before clean up than after. If the bike rare enough it might be worth your time to consider further effort to confirm it can not be salvaged. It looks to already be beyond economical repair or B.E.R As a salvage project maybe you could take a second look, this viewer would appreciate a follow up. Keep the great Sunday entertainment coming.

[@docholliday3150]

Looks like intergranular corrosion in there as well. No fixing that period.

[@GoSlash27]

I like that you A&P guys use the same term (BER) that us avionics folks use.

[@truckguy6666]

throw us a bone. BER?

[@stevematda976]

@@truckguy6666 Beyond Economical Repair.

[@jimmyrivano3477]

@@truckguy6666 It looks to already be beyond economical repair or B.E.R

[@thomasc6412]

What we need is another genuine find for you to restore like the Honda bikes. Great videos.

[@SkrixFox]

My dad and grandfather used to race Penton dirt bikes. They both raced in enduro's. When my dad broke his collar bone in a racing accident, his dad (my grandfather) raced in his place and did well enough for him to scouted for professional racing, but decided to go to college instead.

[@larrymills8527]

I rember him from the jack pine enduro we race in back in the day

[@FrozenToast396]

YAS!!! I was so bored until this popped up in my feed... I actually forgot its Sunday!

[@scootergem]

You tried... And tried... And tried some more. You put up the good fight. Bravo. Thanks for letting us join in...

[@chrissmith513]

Those Penton bikes way ahead of there time way back then ! 👍👍👍

[@KaplanCycles]

Awesomeness!!! Something i would like to work on!!

[@MrJob91]

bro its a nightmare. Like holding a terminal person before they die that suddenly came into your life.

[@seastacker8582]

The first 30 seconds of this video I thought of you. “Kaplan would love this thing!” Lol.

[@darinblomquist422]

Save it!

[@burtmcgurt3584]

Haha go for it, I would call it, but I am down to watch you try :)

[@FUNKBOOGIE1]

KAPLAN AMERICA ? You watch Mustie1 videos too lol

[@MrLucas1012]

You’ve got a serious collectors item there. John Penton built bikes in the 60’s and 70’s using KTM motors. He was a enduro racer and built his own bikes, then penton was available for sale to public. Long before KTM motorcycles. Penton was bought by KTM in the late 70’s. John Penton is a legend in off road dirt biking as well as his bikes. There’s a 250 engine on eBay for like $167.00 plus shipping.

[@april7_]

This is the right way, not some lawnmower engine to this historic frame!

[@AiMR]

Mustie's problem is NOT a lack of engines 🤣

[@MrLucas1012]

@@davecooke4009 I’ve riden dirt bikes for about 50 yrs…. Have you? Restored about twenty vintage bikes… have you?

[@marcryvon]

@@MrLucas1012 Woah ! What's with your agressivity here ? 😳 The guy only gave you thumbs up ! Cool down Mikey ! 😊

[@phillipzx3754]

" John Penton built bikes in the 60’s and 70’s using KTM motors. " And Sachs. The Penton 100's and 125's used them. The KTM engines came with the 175 and 250.

[@alainleblanc4031]

Nothing but RESPECT for tackling this one Mustie, I would not have even tried given the condition the engine was in. You did your best and still taught me how to figure things out. Thank you!

[@davfrui]

Exactly I bet parts are hard to find Or tons were awesome bikes in the 70’s They had to keep ‘em quiet because they were racing bikes only. If ya got pulled over you might not get EM back I was told back in the dY

[@gogglespaesano2931]

This is an American classic and John Penton is an enduro legend. Please treat this machine with the respect it is due. Not suggesting that you would do otherwise. Thanks. Future generations will thank you also.

[@Oldjohn52]

Once, the ISDT was held here in Western Massachusetts. It was 1973. I met John Penton. He was pretty cool but he was intense about what he thought was wrong with Trials motorcycle. Trials are fun to watch. Saw some big German guys thumping up stream beds astride 750 BMW's

[@donstevens337]

Ff"$$$

[@dheadhunter413]

I’m from Western Mass

[@thatsmrharley2u2]

@@dheadhunter413 Me too. Jim Hollerich would get this thing straightened out.

[@kylerealtorguy]

ISDT means International Six Day Trials.

[@dennishernden2264]

Just lookin' at this thing it has got a good geometry and a lot of desirable competition features. She's a ripper and worthy of concerted effort to bring back around.

[@markryland7725]

Love your work and your attitude!!. Mark ryland England.

[@JR-bj3uf]

I used to work for a Penton dealer. Be very careful when splitting the cases. That transmission is like a Swiss watch. I fear that it too is full of the white corrosion. It's sad to see one in such bad shape.

[@michaelv.1107]

Hi Mustie, this one was already screwed beyond repair. The magesium alloy was corroded with no chance for any cure. Even if you didn't poke a whole in it, I doubt it would have been strong enough to hold the dynamic pressure and vibration while running under load. I also assume it got rather sumped and then stowed away than in a flood due to no other flood marks are visible elsewhere on the frame or wheels. For today you should call it a draw with a better chance for victory in the second act. Keep going, I love your channel. All the best from Germany.

[@alan6832]

I would have used an air hammer, dialed back to moderate impact, rather than a puller, to send many hundreds or even thousands of moderate shock waves through the engine, perhaps after soaking it in an acid like vinegar.

[@alan6832]

Think he could JB Weld that piece back in? After a vinegar soak and finishing disassembly? That was the most absent minded mistake I have ever seen him make, quite a shame, as I was more hopeful than he was. I still say 12 hours in vinegar and an hour with a dialed down air hammer.

[@kuhrd]

@@alan6832 In this case, the magnesium case was already oxidized very badly and looks to have expanded much like corrosion in steel or aluminum to a point where it has lost most of it's structural integrity. Even if he was able to clean up and remove most of the oxide the thin walls will still be very weak. With enough time he might be able to get it to a point where it would run but I would not expect the thin parts of the case to hold up well under the vibration and preasures of operation and it woudl likely blow a hole in the case at some point any way. He could attampt to repair it using TIG but Magnesium alloys can be pretty challenging to weld without warpage, cracking and the risk of fire in extreme cases. It would also need to be perfectly clean and free of oils and other contaminates in order to weld with any quality.

[@jzslug5534]

Yes Nikitakkk

[@jzslug5534]

Iiiii

[@chriskayakq-ster7264]

We love seeing you take on these type of projects. The fact this bike "Penton" is a collector's dream would of definitely been worth the try! I kind of think I wouldn't give up on it even though the case blew out. It is a true test in all that is mechanical in our world. If it could be saved in any shape or fashion I'm sure your the "Man" for the job. If you choose to pursue this mission good luck and God's speed !!!!lol

[@tubaman66]

Your unending patience never fails to amaze me. A great watch as always.

[@JD-zm4eh]

It was a gonner before you touched it. Good effort and thanks for the great entertainment.

[@mattus1gig]

You know when you’re 95% through a Musty video and the engine hasn’t coughed into life, it’s not going to end well ☹️

[@edwardanenberg349]

You’ve got a gem there worth quite a bit restored, arguably the best enduro bike you could buy in 74 the bike is all there. Well worth the sweat 😀

[@bradjakubowski8987]

Love these kind of videos. Not always an easy job. Kudos for not giving up.

[@phillipdickinson8557]

Mustie that was fantastic enjoyed iteven if don't work it was good if any one can do it it's you just to far gone never miss a video and can't wait for next one thank you for sharing and your time.

[@falksweden]

With that documentation and the overall state it sure would need a restoration and a working engine. Quite valuable.

[@petenikolic5244]

Something as rare as that has got to be savable

[@OutBoardTink62]

Wow it never ceases to amaze me what are toys that we drive ,ride and push our boats with go thru in their lifetime. I have torn apart many outboards thru the years that are submerged from saltwater and many are restorable even in this condition. I use special rod tools,techniques and a hydraulic press to remove the most stubborn of pistons when all else fails. This bike has seen saltwater for sure probably near a flooded shoreline.I was hoping you didnt give up on it but you gave it your best....

[@michaelwilbur7959]

You are the most patient person I have seen in a long time. Mike Quebec Canada.

[@Mr.M1STER]

I'm always optimistic whenever you get your hands on an old engine that it will run again. No matter how trashed it looks I feel like you will get it going again as we have all seen you do many times before. This one was unfortunate but hey you gave it one hell of a shot.

[@YouTubeSupportTeams]

oh dear Darren. I know the engine is shot but you weren't thinking when you tried to beat that case apart. No motorcycle case comes apart like this, especially in this condition and you already know this my good man. That brass rod went through the side of that case later than i even expected, i seen it coming and i was cringing. The engine was scrap though and as always i enjoyed every second of the video. To even get the jug off without putting a hole through the piston or cracking it was a serious accomplishment in itself.. This video is incredible education for anyone attempting engine restoration.

[@purpleether5405]

i thought this guy knew what he was doing. why would you smash a case like that? especially an old corroded one.

[@giggiddy]

@@purpleether5405 Sadly, he treats everything like a worthless piece of free junk that someone gave him. Force it, beat on it like its a worthlesd VW carcass. It pisses me off sometimes as not everything should be beat and forced into compliance.

[@tomadkins2866]

@@giggiddy Then why do you watch? It was obvious very early on that it was pooched from the get go. He made an honest mistake and admitted it. Point me toward your You Tube channel.

[@purpleether5405]

@@tomadkins2866 You can watch someones content but acknowledge their faults. You don;t have to stop watching just because a person acts dumb sometimes. Why are you such a sycophant who feels the need to praise everything someone does just because you watch their content?

[@doubled2727]

@@tomadkins2866 Mr. Smith is entitled to comment about his opinion. You made a comment and you don't have a channel.

[@carlosanzola2938]

That was the top of the line motocrosser when I was a kid in the seventies. I always wanted one!

[@bartbrown3616]

Great advice. This bike needs to be saved. I have a 400 and a175.

[@nikkodauria]

Happens to us all man. Looks like she was about done for anyway. Enjoyed the video as always.

[@t.s.racing]

Sir, 50/50 acetone and a.t.f. has been my go to for years for a rusted piston/cylinder. I learned that from a senior gentleman who raced Ford Flatheads at Bonneville. T.S. RACING

[@tallboy2234]

That is such a Cool Bike! I’m with you. Keep it around and something may just PopUp that is right for it. 👍😀

[@twofeathers6540]

all ways love your show thanks

[@april7_]

Oh my! 250 KTM from 70's? What a dream engine! Remember that sound and what a machine at least in it's time! Just can't wait to see you Drive this! I got to warn you it surely got some beans and it pulls hard! Oh crap, now you have to put some B&S in it 🤣

[@MrJohnnaz]

I think he should part this bike out and give some other owners a chance to get their bikes running. The frame looks really good.

[@Jeff_Pendleton]

Well, Mustie1 you have heard from the masses. This one needs another shot. I gotta say those fins were really impressive on that engine, and I remembered the Penton name from the olden days (sadly, I was there). Sound like there are several leads on how to fix this one (maybe) or a new engine. Tell you what, if you give it a good shot I won't say anything about the Econoline for six months...rrrring-a-ding-a-ding! Love those 2-cycles!

[@huntergodsey1765]

I love how he always asks for my opinion. I’m not physically there but I’m always giving my input back 😂

[@davidgordon6546]

Thank you Mustie, (and ma and pa Mustie for bringing him to us.) I am saving this video for bedtime viewing, but just wanted to say: I have learned so much from you, but most importantly, to chuckle at adversity, and, if any nut bolt or screw wants to fight with me, we'll, then, bring it on!

[@3rdworldgarage450]

Aaah, Magnesium Oxide corrosion! I have dealt with this on my Quadrajet carburator after feeding it ethanol gas. My researched pointed to using phosphoric acid to remove it, and I did that using a chrome wheel cleaner. It worked well enough to clean out the idle passages and the engine lost it's stumble during transition. I would also be very careful using a torch around magnesium, as it is highly flammable. I remember watching the sad story of the attempted rescue of the B29 Kee Bird in Greenland, where a minor electrical short lit the whole thing on fire and the magnesium in the structure made it impossible to put out.

[@geraldtakala1721]

Small pieces of burning magnesium can be put out with copper sulfate solution,at least I remember that from field medical school with the Marines

[@dj33036]

@@geraldtakala1721 Purple PKP

[@burtmcgurt3584]

Nice, I was soo confused at what the heck that stuff was!

[@drkastenbrot]

Magnesium is a class D fire and can easily be put out with a class D fire extinguisher.

[@SPAZTICCYTOPLASM]

There was a case in rally cross where the wheels of a celica caught fire after the tire popped and the fir department had no hope of putting it out.

[@georgegrierson]

Aw jeez... I was impressed with two things Mustie as I viewed this vid. #1 how incredibly patient you are cuz I would have been tossing that thing in the trash way before you concluded. #2 your bull headed determination to try and get that engine apart and potentially running again. Anyways... I am a loyal fan!

[@jme36053]

The outcome was as expected. Getting there was the treasure! Thanks.

[@Philc231]

I love the hidden messages on the cabinet Darren . The salt must flow , I like that guy too .

[@grandicornis]

Looks like there is a serious notch in the connecting rod from corrosion too. One thought for removing stuck pistons such as this is putting a zirc fitting in the spark plug hole and pumping the cylinder full of grease. On a two stroke you could make a round wooden plug that fits tightly in the cylinder for when the piston gets past the ports.

[@blockheadfxstc0428]

Thank you Mr. Mustie1 as a mechanic myself I enjoy seeing things come apart and finding out what makes them work, I agree that the cases were just too far gone, even if you were able to get it apart "unscathed"😉 no holes, the cases would have NEVER held up to just the mechanical and inertial forces involved in the internal combustion engine if you were to be able to rebuild the engine, there would have definitely been a Spectacular failure of that engine lol, as much as I love to watch an engines self destruction when it happens, someone probably would have been injured by that engines failure, due to the wreck after the failure. Looking forward to next week my man!

[@Eddie.D346]

You can't say that for sure,without seeing it; alot of 2 strokes have VERY thin cranckase's in certain spots....that place that broke out looked like a sealing spot, there's not much stress in a place like that...

[@rupertnungaray9368]

Thanks for all your attempts, I enjoy watching your channel a fail is also a learning experience! Thanks so much.

[@harls9287]

That’s an amazing old machine. The early beginnings of another manufacturer/countries in starting the long road back to competing with the Japanese at a competitive level. Was a long road. Per the other comments please keep this one as a survivor. Thanks as always Mustie

[@keithqueen3554]

The owner needs to go to vintage motorcycle days in ohio this July he can pick up the parts or a different engine there it's where all old dirtbikes stuff is bought sold and swapped. Old guy heaven.🤣👍

[@buchonite]

It says Magnesium on the case , that stuff corrodes if you breathe on it the wrong way it also burns in a spectacular fashion

[@ericeverson5956]

Penton, pretty rare bike. I lusted after these & now Mustie 1 owns one. Good show. Loved it.

[@SMKreitzer1968]

Thanks Mustie1! Much farther along than I thought you would get on it.

[@ProlificInvention]

In the future to break free a stuck engine you can fill the cylinder with oil, make a spark plug hole to grease gun adapter, and pump in grease. The oil displaces the cylinder volume and the grease pushes with 10,000psi which either frees the engine or pushes by the head gasket. Obviously it doesn't always work, but it's worth a shot.

[@Watchyn_Yarwood]

And he could have used the head gasket as a template to make a press plate, drill a hole in the middle, weld a nut onto it and press down in the center of the cylinder instead of gouging up the side. Easy and cheap.

[@manolisgledsodakis873]

Darren, you can loosen all the oxide as follows: fill the crankcase with water and add half a cup of baking soda. Connect a heavy duty battery charger to the crankcase. Connect the other battery charger lead to a large piece of steel suspended in the water. (Wrap the steel in plastic mesh so it can't contact metal.) Turn the charger on. You should see bubbles rise from the casing. If the steel plate bubbles instead, reverse the connections. The gas evolved from the magnesium pushes the oxide coating off with great force. It should be clean in half an hour to an hour and won't damage the metal. Flush out and repeat if necessary.

[@stevenbaker8184]

Actually the electrolysis method might work.

[@johnbrizendine7716]

@@stevenbaker8184 It is possible, the issue is that even then, there will be micro-fissures where it oxidized and un-oxidized, same thing with the reason the positive battery plates on a lead acid battery always dissolve to mush if a battery gets cycled too many times. It will lose all of its structural integrity.

[@stevenbaker8184]

@@johnbrizendine7716 true, that's why I said might work. But magnesium itself has other issues regarding electrolysis. And mustie got lucky he didn't ignite the magnesium.

[@johnbrizendine7716]

@@stevenbaker8184 Yep, either way, it was an awesome vid and enjoyed the heck out of it!

[@senorboardhead]

Highly collectible ! Not sure your ultimate disposition of the project, but worthy of your best efforts. Good luck with it !

[@deaddy57]

I am in awe that you even got the cyl off! Love your inginuity at getting threw issues.

[@rodgermills1496]

Finding a potential replacement motor is your best bet, the corrosion is just too extensive on this one. Sometimes no matter how good you are with the extent of finding replacement parts just doesn't make it worth it. I was surprised you got as far as you did.

[@mriguy3202]

The style of the cooling fins is lovely and the frame is good for its day. As others have mentioned, there is value in a special motorcycle like this, maybe even (shudder) as a non-runner on display somewhere? There are lots of bars and restarants that would love to have it hanging from the ceiling. It's beautiful. When heating up the cylinder, since you want to heat it rapidly before the heat soaks into the piston, why not try using two torches at the same time, one on each side?

[@tarstarkusz]

The problem is you are fighting the design. The surface area of that assembly is just enormous.

[@tomadkins2866]

Sure it would be a shame to see it stuffed and mounted, but is really beats the alternative.

[@kennethbauman3006]

Thank you Mustie1 another exciting video and project sorry it didn't turn out the way you wanted it but I know you wont let it go so easily .You have a good mind set and a good work ethic keep up the good work I love your channel .

[@paulgaudin4526]

Big fan Mustie, I look for a surprise every Wednesday for a vid like a pup looking for a treat.

[@fourhillsfarm]

45:30, you had your finger on the key. Push the wrist pin out, cylinder and piston come off together. On a good note the bike is in amazing condition. No paint worn off the frame, looks like original tires, kickstart and gearshift levers intact. Find replacement parts, no repowers please!

[@fourhillsfarm]

The clutch release mechanism appears to be like new. It is unobtanium and worth its weight in gold.

[@philhitch1924]

Shock mounts are not standard

[@alanparis7256]

Clutch basket and crank nut should have been off before trying to split the cases. If you put another engine in you could just flip the back wheel around so the chain runs opposite side. Great vid thanks for showing.....

[@domosautomotive1929]

Can't flip the rear tire around.....have fun getting the brakes to work

[@alanparis7256]

@@domosautomotive1929 no problem. I have done it before. If the tyre is directional just take tyre off rim and put on other way. Re the brake again no problem, the brake support arm can be on top and pivot accross near rear engine mount / frame. Just needs a little thought.......

[@dr.leonardhofstadtersavage6413]

That's the most corrosion I ever seen in a motor, great video Mustie1 👍👍👍

[@donnie2533]

Great video glad you posted keep them coming thanks

[@billstuart8481]

There's an entire lower end with transmission on EBAY right now for 170 bucks. If this were mine I'd make that call and get her running again. Those KTM engines were a step up from the earlier Pentons with the "glass transmission" Sachs engines. A rotary valve CanAm engine is also right hand out put shaft and looks like proportionally like a good fit. Not that there's a a lot of them laying around either.

[@nickjones886]

Don't give up on it Mustie!!, just think of the sound of it ping, ping'in away.. Surely the casing can be fix with some Ali Welding, that would be an interesting video in itself. Depends how much "stuff" you got building up.. I returned an old 60's Styhl motorsaw back to life that looked like that inside, bonus, a tree fell on it breaking it in half... was 16 at the time, over 50 now and it still runs..

[@alt7488]

research the guild in Canada he did some mag welding, on his Bugatti project it was a bitch

[@BlueHaze7024]

As the video clock ticked closer and closer to the end it became evident we were not going to hear Mustie's maniacal laugh while the engine roars to life.

[@davfrui]

DUDE !!!!!!!!! I haven’t heard the name penton motor scooter cycle since 1977. It’s nice bringing up memories. THATS A REAL COOL BIKE WHEN YOUR 14. To 18 or before I remember the two cycle was loud. Like when they went by as a kid they blasted more than say, Yamaha or Suzuki but they always let off a lil bit 😀

[@marlinhomrighausen6875]

One word when working on such things.....PATIENCE!!! I learned a long time ago that trying to get something such as this project apart in the short amount of time that was spent almost always leads to breaking things. I have experienced much success using patience and allowing the rust/corrosion inhibitors time to actually soak into the areas. I also use CONKLIN & STRONG ARM products with much better success than what you are using. Next time please take the time to remove the engine and allow the inhibitors to soak in from the top and the bottom. Sometimes it takes awhile. Overall I enjoy your videos. They present learning opportunities for a lot of people. Keep up the good work. 🙂

[@chuckhaynes6458]

KTM's are really good dirt bikes. Far superior to anything you've had on your channel. It's worth fixing and yes the parts are out there for it. I raced Maico's, CZ's and KTM's years ago. If you fix it you won't be sorry.

[@nightmarecivic]

Out of your 99.99% repair success rate, this is your 00.01 so don't worry about it. We love your videos no matter what.

[@NervusEnergy]

You gave it the ole college try! You did good, as good as anyone could have done. Keep making these awesome videos!!

[@scottyb069]

Magnesium is a highly reactive metal and is sacrificial to steel, so while the cases might be a bit thinner the crank could be quite salvageable. I’m not sure if vinegar would work to dissolve the white magnesium oxide? Or whatever compound it now is but worth a try. Definitely worth trying to save it even if you JB weld the thing back together.

[@peterrimmington7100]

I have visions of this engine submerged in white vinegar, its worth a try.

[@steves2694]

Thank you for the explanation. Thought it was flood water plus laundry detergent 😳

[@craighopple5678]

Vinegar in a heated ultrasonic bath should break it down. 🤞All good things with time!

[@charlesangell_bulmtl]

@@steves2694 Sound like you might have dealt with corroded aluminum washer parts? Neighbor replaced an aluminum drum support casting and associated bearings from their washing machine. I used the shaft and bearings to add an engine stand function to my HF engine hoist.

[@EbonyPope]

He has so many pullers but he tried to split the case by hammering... That was really idiotic.

[@sonovoxx]

A REPAIR manual?? I'm sure you'll read it from cover to cover... 👀😂😂😂

[@joegfjh]

Mustie- *sees repair manual* *sets manual aside* *buries manual in parts* *starts grabbing tools* 😂

[@stevejuststuff2779]

My buddy has one. He completely restored it. It's beautiful... Great video

[@cuttnhorse2013]

I remember back in around 1972,1973, I watched Jack Peyton school everyone in the class! I was in different areas of the track in Red Bowling Springs,Tennessee . The race began on Main Street,then through the woods. Jack seem to come across a creek, up a large embankment and on out of site on the first lap minutes before the next competitor! The dud could ride and the bike was a beast during that area. Just thought I would share. Best of luck, Ronnie, East Tennessee