Seller Said " This Dirt Bike Just Needs a New Piston Ring"

[@arthurbolton8477]

Hi Joe love your videos just a word of advice from a old biker mechanic with 2 replacement knees get yourself a roller starter or make one, then you can just spin them over and save your knees.

[@joelatkinson2080]

You should contact Weisco and tell them what happened. They might want to examine the defective part to determine how it failed and give you a replacement crank for your troubles. I think it's worth a try. Another great video!!!

[@Shadow0fd3ath24]

its a 2 stroke motocross bike thats high rung and easy to abuse...i doubt theyd even respond, especially after 30+ hrs and the wrecked cases

[@guschristensen5671]

it's 950.00 you got what you paid for change cases new crank zoom zoom

[@lionblue3449]

Painful watching him Kick-start it

[@dc6233]

More than likely the crank was damaged when installed, maybe when they trued up the 2 crank halves which is done by beating on it with a lead hammer. Maybe they used a sledge hammer...

[@marcalan1198]

​@@lionblue3449I've never seen such cornball maintenance. Kicking 50 time's obviously something else wrong. And when he said new plug could be faulty??? 😂😂 This dude. But the walk around was. Pretty Sweet dorky Dirk

[@AnthonyRBlacker]

I'm just in the beginning, but for what you paid for that absolute blast from my own personal past, even if it need an entire top end rebuilt, piston, ring - maybe not to have to split the case, but even still - totally worth the price of entry on that one Joe. I don't know how you keep finding these sweet bikes man, all these old 90s bikes were what my friends and I all had back then.. man what memories!!

[@JohnTownsend-mm1jj]

Hardest working man on KZbin love every single video that you do mate keep it up ❤

[@corvo1324]

This is a hidden gem of a channel! Definitely one of my favorites.

[@greathornedowl3644]

Agreed, 1) the focus is not on him but on the project 2) plain-spoken, talks you through steps/thought process, 3) laughing as I listen while glancing away only to look up and see dancing orange hands (gloves) across the screen.

[@wayneg.7605]

Thanks Joe for the great content! You have encouraged me to resurrect my old fleet of trail bikes from the 80's. Good therapy for an old guy.

[@wags9777]

I was waiting for the Kickstart lever to break off

[@nunocatarino2536]

Your videos are great. Learn a lot from just watching. It’s impressive to see the shenanigans that people do in motorcycles just for it to run instead of doing things right… Cheers from the other side of the world!

[@grudzien9784]

I love his videos too, he really loves this stuff, takes his time going through everything, no better videos out there!

[@michaelmcguirk7979]

Tbh I didn't learn a thing, his skill level is so far above mine I just sat back and enjoyed his work 😂

[@allenmoaley385]

I would had checked the plug first thing

[@robgreggs4933]

Made popcorn when u were kicking good snack

[@robsim4692]

I'd definitely message dude one last time and tell him thank you that you cleaned the carb, changed the gas and pissed on the front fender and it runs great!

[@darrinwoodward14]

Never have I had a wiseco crank or rod fail.the problem came from the installation,they probably used a vertical press and probably very poorly at that.i have literally installed hundreds of wiseco products over the years.

[@monixx9081]

Vinnie thought it was the piston rings too, also the stuff in bowl looked like it turned back into corn

[@snowyowl7042]

🐕He thought the engine ran ruff ruff

[@marsvenusplanet]

@@snowyowl7042 vinnie knows something is quite not ok with this..lol

[@allan9603]

​@@snowyowl7042snap

[@luiscotto6659]

After 4 kicks is good to say something ain’t right 🤣

[@TheDennys21]

He kicked it 47 times, i counted. 😂

[@wayneguy6043]

Lol

[@dougaranda6187]

Now THAT is crazy! No wonder Vinnie couldn’t figure it out.

[@2vintage]

Yeah he was stumped on this one

[@sean.g4516]

​@@2vintageso that's the 3rd yz250 that you've bought that same model 96-01? I've seen 2 different ones in your other videos, are you keeping them all?

[@hotified2]

As always awseome vid's, the only question i have, which is driving me crazy, in you last couple of videos you have a super anoying beeping sound in your workshop :D

[@thebigguy8306]

A project most of us would have RUN from. Your patience and knowledge will be tested. Keep up the hard work, sub up, view up. 2Vinny is suspicious of how much this will cost us in Alpo money. Either that or the seller had a dog

[@RandomDudeOnYoutube]

I bought a running 04 yz 450 but it looks worse than this one 💀 Maaaaan i got shafted 😂

[@thebigguy8306]

@@RandomDudeOnKZbin 🤷🏽‍♂Don't know what is worse, buying something running and it fails, or something not running you know needs a rebuild - guess not running = cheaper

[@RandomDudeOnYoutube]

@@thebigguy8306 i mean, its okay, it didnt fail so far, but Overall its just had better days... But yeah i guess buying non running for under a grand is definitely the way to go, especially if it's in this condition and you can do all yourself

[@bobovv6060]

Wow. Like you said, the gunk in the carb was probably because he tried running straight ethanol. That might have screwed up the crank bearing (got no or little oil in the mix), and thats what snapped the new crank. Anyway a fantastic channel love watching you work on these bikes 👍👍👍

[@greathornedowl3644]

I was thinking the same thing - gasoline. For an engine not meant to run on 10-20% ethanol (standard gas in Minnesota), it can be crappy for an engine. My rule of thumb for most older or small engines (snowmobile, snowblower, lawnmower) is non-oxygenated non-ethanol gas.

[@dublindave5795]

@@greathornedowl3644 If only you could get that in California.

[@AlAmantea]

My guess would be that those bearings were damaged during the rebuild and the crank nose was cracked during the bearing installation. This lead to the crank failure after the rebuild. The bike probably didn't run after the crank failure, saving the rod bearing, but the seller probably was feeling done with it after the rebuild and didn't want to mess with it. Since he didn't replace the piston/ring, he figured that was the issue since he replaced everything else.

[@darbywing2]

You are correct.The bike would have stopped running the instant the crank sheared; as there would be no timing for the spark.

[@bleakyfinder2692]

Excellent content Joe as always. Maybe just maybe you might cleanup the engine/outer casings dirty bits?

[@TheScottiem303]

I have asked about this many times. Makes no sense to not clean the bike a little before tearing into them

[@bradley7723]

Your comment will fall on deaf ears. This same comment has been suggested 100s of times to no avail.

[@2vintage]

We will see haha

[@taryn1220]

​@@2vintage🤣

[@gradeywarey4448]

I have a 2003 Harley Davidson V -rod that I broke the shift shaft laying it down to miss the rear end of a Camry … and I’ve let it sit for 2 years almost . Just because of rumors of how tedious of a repair it “Could “ be . You’ve inspired me to take a crack at it . I haven’t found a channel I like so much in quite a while . I like your style and simple approach. I appreciate that man . I subbed and hit your bell . Thank you 🙏

[@MrATOMBOMB420]

That is a very very common thing with Wiseco cranks they have been known to fail like that and I recommend to all my customers to absolutely not use them a lot of people say hot rods are bad cranks but I've never had a failure of a hot rods crank but have seen multiple Wiseco cranks fail in a very similar way

[@alicerhodes7437]

what cranks do you recommend? 😢

[@johncoldwell340]

When you was kicking it over with no plug even through the phone you can hear the crankshaft bearing I was surprised you didn't hear it straight away, but great video love to watch these Exploratory strip downs👍

[@geraldrichardson7252]

Vinnie sniffin out the VIN numbers!

[@Jackp53]

What’s up with all the dog comments

[@edwardestes8038]

Seller really means....This bike just needs a new engine....frame ,wheels and everything else...!!

[@George71964]

Sorry it turned out bad, but it was a very interesting episode. I have never seen a complete teardown. Now, I'm looking forward to the rebuild.

[@RandomDudeOnYoutube]

Keep up the vids! You already helped me a bit with your videos on my old 450 i bought... thanks man 😅

[@andrewmapes8205]

love the vids bro, Long time watcher here. But the crescent wrench to take off the plug is KILLING me 😂

[@jacobweidinger6822]

Using your videos during cardio just pure relaxing man love it

[@jakeslouw3416]

Whomever rebuilt that crank used a hydraulic press with very little mechanical sympathy or common sense. And it was a budget rebuild: they didn't even bother to replace the seals for the shifter shaft, countershaft sprocket shaft, or kick starter. Real backyard stuff.

[@cbh148]

Rebuilt the crank? Is it not just a cheapy Wiseco crank?

[@MrSillypoptart]

Yeah and Cranks for these are only $125-$150 on ebay. very very cheap

[@mikeschlup5279]

I cannot imagine what happened to snap that crank at the thickest spot???

[@bfox87]

Cheap aftermarket crankshaft most likely, would of been better off putting a cheap rod kit in a factory crank

[@jerrywilcox9890]

You have know clue what your talking about 😂😂.

[@UrbanoModa]

nice honest videos,, i have a duke 390 but its good to see a lot of these videos recently and see the workings of head problems.

[@luuk-out-below9804]

Ran fine the last time we rode it....... Good teardown looking forward to the rebuild!

[@Darkgrabba]

I was thinking crank seal. Did not expect the Bluetooth stator. Wiseco cranks are hot garbage.

[@iamthefatstig]

I'm wondering if the gear tooth failed first, got momentarily jammed in something, and that was enough to cause shockload through the crank? Great video. I applaud you keeping a sense of humor during the strip down. mine would have been R rated!

[@sandmanbub]

The broken tooth came from a gear that is not in the crank case. The crank case has no openings leading to the clutch/transmission and nothing from the clutch or transmission can find it's way into a bearing inside the crank case. The kickstarter mechanism is also outside of the crank case (gear tooth)

[@thediddly]

Plugs are really a one use only, the seal beds in like a copper washer. You can get an airleak from the sparkplug too. Also you have been doing this long enough to get a ring spanner or correct socket for the sparkplug, a shifter is bad practice

[@robsim4692]

Usually all they need is a carburetor clean and good to go! Then you get them home and they're good to go alright!

[@JamesCammer-h5r]

The 1976 RM125 sheared off the flywheel end of the crank after a couple months. All my friends raced those bikes and within 2 weeks they had all done it ! Suzuki warranted the cranks but not the labor to install them. Not a good deal and waited months for the new cranks.

[@jeffroberts532]

Well, Vinny was all over that engine. And when asked about it he barked. Normally, if the bike is generally okay he will look at it and quickly lose interest. But this one he kept sniffing around the engine & was cranky. He knew! He’s obviously a mechanic savant! Joe, you need to start taking Vinny with you when you buy, so that he’s in on the price negotiation. He could save you a lot of money & heartache.

[@SVCRescue]

Broken crank is crazy! Would have never suspected that, good troubleshooting. Keep them coming, I enjoy your content.

[@templartoto4416]

Love your videos , waiting for a part 2 on this bike .

[@daveco1270]

That would be awesome, if you could train Vinnie to alert you to the problem.. like those dogs that can smell tumors or sense a seizure coming on. I think he could do it. One bark for dirty carbs, two barks for stuck piston rings, growl for broken crank, etc.

[@2vintage]

He already does this lol

[@ladyjedi3D]

Vinny!!!! 🎉😊

[@GNX157]

Considering what broke, the associated carnage is really not that bad. It could of been so much worse if you think about it. Just the fact your flywheel and mag electronics are okay is a blessing. I think I’d be looking for another set of bare cases though too.

[@Sam-ob4of]

*could HAVE

[@GNX157]

@@Sam-ob4of I know the right way but I don’t like how the contraction word looks on paper (could’ve), so I write could of, but I say it like the contraction. Consider it Jersey slang.

[@junesondrab3833]

​@GNX157 I agree on all levels... Could of been much worse.

[@kencannuck]

​@@Sam-ob4ofGeez! Grammar patrol gets everywhere!!

[@Blitterbug]

@@kencannuck We do! But I restrained myself here.

[@TroyRosenbaugh]

You and yours, Have a great Thanksgiving. See you in part 2... good luck, great. Vid!!

[@MastahDriver]

man i move these videos. he brings us with him every step of the way. learning a lot

[@YouriCarma]

The mystery of the fail always makes me come back to your channel which also learns us a lot of course.

[@2stroketyson79]

Who else knew what it was as soon as he spun the crank freely?

[@andrewlisenby9693]

I've learned from the way you approach each bike, visually, then a system by system check until you find the problem. Having experience in working on a certain type or model is a big plus, but it's not the main thing.

[@jeffreyness9741]

Love the video. All those kicks make my stomach twist around , I've never seen anybody kick a bike that many times. Don't the racers use electric wheel spinners.

[@trevor2830]

This video just made me appreciate rebuilds and the people who do a good job with them sooo much more. Love the vid, Subbed and All the Best!!

[@JAYMXC]

We had a year old Suzuki RM125 that broke the stock crank at the same location

[@EarthSurferUSA]

10:42 That is a perfect plug color for a carb. But it does look close to the edge. It looks like perfect jetting set by a pro tuner for that day of racing at that track. He probably dropped the needle one groove.

[@Thundarr995]

I had an 85 YZ 125 back in the day. I used to ride it a lot, nearly every day. One day,I rode it inside the garage and parked it.The next day,it refused to start. I couldn't figure it out, so I brought the engine down to my old high-school,small gas engines & metal shop class. My shop teacher found the problem in about 15 minutes. The flywheel cracked around the rivets. So my mom lent me some money to get a new one and a new piston, rings base & head gasket. It was running good as new after that. I still have an old bike, 1990 KLR 250,still runs good. Btw I've heard of those aftermarket crankshafts are sometimes out of balance straight out of the box. And I've heard of them breaking also. If it was mine, I'd probably try to find a good used Yamaha crank,and have it rebuilt. Idk if you can get a brand new factory crankshaft for that bike anymore, because of its age? Maybe some shop has one squirreled away? Good luck.

[@isaiahstanley1148]

49:18 we said wow at the same time 😂 man this goes to show you never know what you are buying from someone lol

[@jayjudd6518]

😮😮 I’m sure glad you got this one now we have something to talk about to our friends. 😊😊When you opened it up you were in disbelief how could this happen without more damage. Can’t wait to see the conclusion. 😮😊😊😊😊

[@slotty15]

The same thing used to happen to the crank of the 1725 cc Holbay engine of the British Sunbeam Alpine in the 1960s until they rounded out the sharp cut between the crank and the flywheel hub. It started the science of crack starting fatigue.

[@DRZrider07]

My friend who has had 2 strokes his whole life told me that if the crank isn't balanced or trued, it'll vibrate until it snaps.

[@christopherterry5831]

Crank not assembled and checked for runout correctly. This causes misalignment and vibration which probably caused the failure. Always clock and measure crank runout before assembly. Damaged bearing seats also causes misalignments too.

[@peter7624]

Well at least the piston ring was ok! I've never seen a crank broken like that before thankfully! It makes you wonder what kind of abuse it was subject to. Great video, thanks! .

[@nehemiahcoble]

Basically the same bike I’m rebuilding right now mines a 2000 biggest thing is that it needed a top end rebuild, clutch plates, and crank seals. Love the yz bikes their great to work on

[@thebraapdawg]

Just now found you and as a mechanic I'll be watching more of your stuff!

[@mike.4277]

Great video. I've only ever seen a snowmobile engine crank before, but never a bike engine. Very weird

[@petepeabody8905]

Vin figured it out right away on first sniff, but loves to see you struggle.

[@2vintage]

Yeah he loves to see me struggle lol

[@robsim4692]

4:20 while trying to start motorcycle it sounds like the p92 upside down bolt has went bad and the flux capacitor is flooded

[@bobconaway]

Another KZbinr I watch who is very good at diagnosing engine start problems, with the results you have and before pulling the carb, squirts a bit of fuel/oil mix directly thru the plug hole, reinstalls the plug, turns the engine over. Often the engines will start at that point sort of confirming the carb as the problem. FYI.

[@MarcooMRT]

Awesome video once again dude. I think it could be fun if u found a derbi senda or any 50cc full sized dirt bike for sale over in the us. They are very popular here in most parts of the EU, and would be cool to see you work on one of those :)

[@patrickdevonshire308]

The way you were kicking it surprised it didn't weld back together 😂. Like you said the oil cap is real nice tho.😂

[@joekarl7342]

Wow, sheared off crank that's wack. Even crazier is that it had a spark. Love watching your videos. Sad that so many sellers are not honest.

[@GNX157]

Airbox looks very similar to the 02 CR125/250 so check for an airbox mod kit. Stock ones are terrible and leak dirt around the mount flange from the boot to the airbox. The boot can bunch up (get wavy) and bulge out in places, allowing dirt inside.

[@larrywarner9314]

I'd never put those reeds back in that bike like that , my buisness and my reputation is top notch where I live never send half ass work out the door, or sell that way .

[@jasoncompton3735]

Send a pic of that crank to Wiseco. No reason for a failure like that

[@andrewsock1608]

The reason is rebuilt cranks are not balanced properly like they do at the factories. Rebuilt cranks shake motors apart or themselves in this case. It was a perfectly good part and bad assembly that caused this. Only factories have the accurate equipment needed to ballance a crank properly.

[@bradley7723]

​@@andrewsock1608 I use a crank trueing stand and duel micrometers to fully balance and true a crank within .001 factory specs are .003 to .005. It does take time but once finely trued up it will be closer tolerance than factory. There are many videos out there that show the technique. There is 4 axial points that need to be trued.

[@andrewsock1608]

@@bradley7723 vibrations will tell if your lying or mistaken.

[@bradley7723]

@@andrewsock1608 vibrations known to be from the crank are cuased by the crank not being true. For $650 you can purchase a trueing stand complete with duel micrometers . And by reading the mic and rod pin alignment you can tell if the crank webs are spaced in or out ( angled in or out) and web lineup in relation to rod pin and crank output shafts. Just by dropping a crank from several inches can untrue if it lands on one part of either web. The trueing stand is valuable and easy to learn. There are some great vids on crank trueing. I believe one of them is "2 stroke stuffing"

[@mikedahoe2251]

Cool vid man,,,twists, turns, a puff of smoke, then disaster, holy crap... I thought you were just going to change the plug boot then we'd be ridin lol

[@grudzien9784]

So cool watching this, he’s working on the same bike that I own. Just 25 years older 😌 I love seeing this.

[@oldguysoldbikes]

I think they might have stressed the crank when they replaced the rod.

[@azopene]

Great video. How about a video of the reconstruction and the bike running?

[@drd1924]

Great vid man, I would suspect Ebay cranks would be even worse Surprised a name brand like Wiseco is that bad.

[@ctjanney]

Just subscribed. Your videos are fantastic, and really appreciated.

[@jasonjavelin]

-Seems like a decent deal that thing is super clean!- that case bottom is such a heartbreaker. I got my KDX with “just needs a top end” and it was way more than that lol I have a Wiseco piston and it’s been great but all the stuff about the cranks I’ve seen has been very negative

[@philippelegrand7992]

very nice video. I enjoyed the way you tackle the concerns. On my own ,i have got the same crankshaft broken concern on an Husqvarna chain saw but on the output pinion.

[@snowyowl7042]

Yikes, what a mess. Always a learning moment. 😢No riding today.

[@peterlindsay2869]

I see that happen on snowmobiles quite often.

[@leelafarlett3535]

Nice house you got there vintage. Fixing old cheap motorcycles must make good money.

[@erikdejong2091]

I also had the same problem with my CRS 125 cc ICC kart engine, but on the other side. The crankshaft had just been replaced with an original one, but it simply broke off for no apparent reason.

[@bradgeagley4019]

You can use another end wrench on the open end with the box end over one side of your open end wrench creating a longer breaker bar setup

[@chrisbilling]

Love your videos man. I have learned a lot. Would you consider doing a video explaining all the major components of a dirt bike engine? That would be a master class video

[@thomass2055]

I think some one put straight gas in that bike which led to the first failure. Rebuilt it and didn't replace the bearings when those bearings get hot due to lack of lubricant they distort and excess wear. Which caused the new crankshaft to fail. Pull the bearing off and look at the face of the crankshaft where it was on the bearing and see if there is any discoloration and if there is that says there was a lot of heat in that crankshaft. I did some more research that they had problems with a supplier of materials 5 years ago and the metals where not within specifications and caused a lot of issues

[@thebeddoctor4273]

I used to have a 1986 KDX 200 and one day it wouldn't start. We lived in NC at the time. No matter how many kicks or bumps it wouldn't start. We were moving to Florida and as I unloaded it in Florida off the ramp I bumped it and it fired right up and ran great up until I sold it. Also that bike had about 15 years of riding on it and had original engine. Why are bikes these days needing rebuilds after like 50 hours?

[@Rooonga]

I’ve owned & fixed my own & a few friend’s dirt bikes for nearly 40 years and have never seen a crank break like that!

[@ShaneSpence-nf4yg]

Can't wait to see the rebuild. Thanks

[@bilinda508]

Can't blame Vinny on this one...lol he knew it wasn't just right tho..

[@husky500cr]

I like ace mechanic Vinny. He knows his stuff.

[@fiero880]

Wow that is insane!!!! Never seen anything like that. Heard stories about snapped cranks but never seen one.

[@emiljohansson8435]

Oh.. and I though our kx was bad 🤣 I hope keep us updated 🇸🇪

[@hermanackey5150]

I love when ur dog be sniffing things out like he really trying to help you 😂😂

[@timjordan3671]

I saw this once before on a Honda 4 wheeler. I argued there couldnt be any thing wrong with the crank. It was...was twisted, not completely snaped yet. I think it may have been after a rebuild too. Fragile little things!

[@greathornedowl3644]

Good-Great Buy - time will tell. Looked in good condition, but as I recall these can be Very Good bikes, lots of Zoom Zoom, 70mph from a 35hp engine. But engines often have to be rebuilt (top end) every 20-30 hours. Good luck, and keep up the hard work Vinny.

[@EC-mc7vg]

Ran into this 45 years ago with a 4 stroke Honda. Rode it hard as hell training with a motor cross racer, then went home, the next day bike was hard to start, started and was very weak and boggy, tore it down and the crank was broke, mine had a more pointed cone shaped deep break so it was still rotating on the magneto side and sparking. I think on your bike the previous owner put in a new crank assembly but didn't replace the crank bearing and the crank banging around was what caused the break.

[@Jeffrose_]

Excited for the next video. I love those old YZ 125's.

[@KyleMotos]

Literally in the middle of an 02 yz125 build. Guy said just needed a top end. Well the whole bike is being rebuilt now 😂😂 crank had mini seized when the bike overheated so I’m going through everything and re doing it all to spec. It’s never what they say it is and now I know why people low ball or walk. Got mine for $950 as well 🤘🏼

[@117moose]

I didnt make it throu yet but you said 33hrs, look at the paint and the rad. Way more hours on that bike.

[@johnhall9645]

How it managed to have spark definitely surprised me

[@Nele_BiH]

i am from bosnia and we had allot of slovenian Tomos mopeds and i tought i have seen everything but crank splitting is something new.The clossest thing i have seen simlar to this is magnet spinning on crank because key was broken.

[@SO-LOUDx1]

I love this bike, bought one off the show room floor. Really fast right out the gate,for a factory bike