Bought a Busted Yamaha Enduro 360.Will It Run/Ride?

I picked up this 1974 yamaha enduro 360 made in 1974 in unknown condition, well it ended up being a pile. now it is time to try and fix it's blown up engine.

[@bryantfamilyrules]

After 5 years of watching this channel I finally saw a piece of equipment on the side of the road. I stopped, asked if I could take it, and then brought it home. As I was loading the 8.5hp Troy bilt pressure washer up I was informed by the previous owner that it probably needed a new starter. It had a pull start so I just smiled and nodded. When I got it home an applied all of the diagnostic knowledge I amassed watching mustie. Hit the spark plug with a wire wheel and put gas in it. It started on the second pull. I hooked up water and no leaks. I then pressure washed my patio. It’s a 400$ machine I got for free. Thanks Mustie.

[@barrymcbride]

Did you do the mustie1 laugh 😂😂 Just love the mustie1 channel

[@tmscheum]

My Mustie moment was a Troybilt wood chipper that wouldn’t run. Paid $50 and cleaned out the carburetor like Mustie has shown us. Runs like a champ!

[@bryantfamilyrules]

@@tmscheum that’s freaking awesome! A wood chipper would be really handy.

[@bryantfamilyrules]

@@barrymcbride I don’t think I would do it justice

[@vhfgamer]

My mustie moment was a pair of honda trail 90s. Got em for a song, did all the usual mustie1 stuff, and got a couple good running bikes.

[@phoenixsmith6026]

why do we love the Musti1, theres no hype, its just you and your best friend working in the shed like it use to be, rather then all this OMG running about and fakeness of other channels, we are not all 12 years old that need hype and show man ship, wish more was like this

[@familyengineering5591]

I like how theres no women here. This is clearly a mens space channel.

[@captnmike597]

As long as Mustie keeps wrenching I don't care what they do on those other channels. Take care of your neck Darren!

[@phoenixsmith6026]

@@familyengineering5591 i checked my underware, defo at least one woman here that be me

[@zippo1009]

AMEN! 👍

[@TheSaturnV]

Agreed. I see videos from these guys with 1m subs and it’s 2 minutes working on the project and the rest is just “content.”

[@eugenioarpayoglou]

Guy recovering from a neck injury says he's taking it easy by test riding dirt bike in sand pit. See kids, this is what life was like before cellphones & the internet.

[@johnhargis4566]

Yes it's ridiculous when people are sitting a table texting each other instead of just talking 😮

[@kjdude8765]

Yeah, back when Men were Men and died at 50 to quote Mustie himself.

[@hogfader7424]

I had a 1975 Yamaha 175 Enduro with the blue gas tank. I had hills and bayous to ride. It was Heaven. This was in Alief Texas mid 70's. Your video brought back great memories, thx!!

[@billmoran3812]

That’s like the first motorcycle I ever rode. A friend I worked with bought one brand new and let me ride it. Started my love of motorcycling.

[@zanforsh]

For once I can give you some advice. Get a block of wood with a slot in it to take the conrod. You can then sit the piston on this to hold it steady whilst doing the fiddly bits with the piston rings and starting the jug back over the piston/rings. Rebuilt lots of small 2 strokes, it is a pain!

[@David-yo5ws]

Just about to go to bed when, hey, Mustie1 video and on an ol' Yamaha. My first bike was a Yamaha. Great fix for few parts. Never doubted you for a minute. Almost 2am in New Zealand, so good night from me!

[@fxr1991hd]

Down fall of this engine series was that little oil pump failing... Had one and it failed on me three or four times , seized the engine up twice...Yamaha dealer even pulled a new engine from another bike and it failed also.... They bought the bike back from me.... When it ran..Hold on!!! it had some reall BALLS!!😉😁😄

[@AnthonyRBlacker]

Wow.. great to see this one get at least riding again, she really is in good shape other than possibly the crank.. Hope you heal well after the neck thing, jeez.. careful Darren, seriously!! We are only getting older haha, still young at heart maybe, but man.. the injuries come SO much easier as we age don't they?!

[@cynturner906]

Mustie you’re gonna get me in trouble looking for a dirt bike now haha. That bike has some potential. Great video. Hope all is well and great to see you back. As always very good content. Thanks for all your hard work.

[@deathklock333]

From what I recall those are called needle bearings love those old bikes

[@roberthanks4626]

My best friend had one the week before we were to leave on a weekend trip to north Carolina his engine got noisy. The dealer mechanic told him it needed a wrist pin they didnt have it had to be ordered. He said im leaving friday to north Carolina. The mechanic said i cant fix it. After going round a few more times. The dealer owner said the best i can do is if it lets you down call me we'll come get you. We made the trip with me riding a Suzuki. Only thing that happened to his bike was it got more noisy by the time we got back and he got it fixed under warranty. I sold my Suzuki and bought a yamaha.

[@MRrwmac]

Mustie1’s, no fair you get to have all the fun! I’m takin my stealy and goin home

[@benschlack5814]

I have never ever needed a ring compressor on a 2 stroke 😂

[@joshuaharrison9331]

I think old 2Ts might be the only place where I know a tad more than Mustie :O! No way I would have run that on the old big end. Plus needed to measure squish & ring gap else it could grenade on the first run. That poor pipe too.

[@joefin5900]

In the '70's, we used to ride our dirt bikes on the beach in the Winter from Salisbury up to Seabrooke. Then somebody complained and that era passed. I had a Montesa and my brother had a Hodaka.

[@sdyeg73]

Mustie came though the light Jesus!

[@muskokamike127]

1:11:11 too bad about that crank bearing, it's not going to last hammering like that......

[@mikespikeey4625]

all DT`s sound like that rattally top end i had dt 50 dt100 dt125 dt175 dt250 and my mate had a dt400 all in the uk back in the 80`s , and my mate just rebuilt a dt 100 for the road and sold for over 2k and i payed £$50 to £$100 back in the 80`s

[@JohnGotts]

You are the best teacher of mechanical systems on KZbin. I enjoy every Sunday's lesson.

[@Laz_Arus]

Welcome back. 👍 Missed you last week.

[@sandmanbub]

Never bore a cylinder before you possess the new piston. Always measure the new piston, then bore the cylinder for the specified clearance. That's the way I've always done it. I have 2 old boring bars and only use one of them. I have the unused one in storage. If I'm ever heading your way, I'll contact you so we can meet somewhere and I'll give it to you.

[@DavidM-yv9js]

Great seeing you get the 360 running. In 1974 I bought a 1973 Yamaha DT3 250 that's the color as your bike. 50 years later its still in my garage!

[@daleburrell6273]

@@DavidM-yv9js ...does it still run...(?)

[@RZ-eu2rl]

A sigh of relief heard around the world.

[@High_Caliber]

lol agreed.

[@GrantWaller.-hf6jn]

I second that

[@Taydrum]

I hear you, but he can take a week off if he wants

[@GrantWaller.-hf6jn]

Yea I was thinking Mustie went to see his folks in Florida.

[@erniefoster7116]

Thanks to Mustie I bought a 1974 Kawasaki 100cc G4TR agricultural bike for $100.00 at a garage sale the old girl ran but was a bucket of rust and badly maintained parts, I was lucky enough to get three spares bikes and was able to do it up to look almost like new with paint and new decals. Took 2 years on and off but so enjoyable just to go through the process and see the final outcome. In the end I got her licensed for the road and sold her for $1600.00 which was pretty much what I put into it all up. As I said it was the process of doing her up that the most enjoyable part. Cheers Mustie from down under.

[@derick2986]

I think I would've had to keep it 😅

[@EllisDmented]

My first motorcycle was a 1973 kawasaki MC90 Enduro. That was back in 1978. I was 10yrs old. Wow, what I would do to have it now.

[@nicholasviney5975]

Brings back memories of riding bikes around as kids, learning how to ride bikes in fields and tracks

[@franmello5412]

In 1976 I bought a 72' RT1 360, my first registered vehicle, that thing was loaded with torque and took me everywhere! Great memories hearing it fire up!

[@daleburrell6273]

@@franmello5412 ...HOO-RAY...(!)

[@markdahl5812]

Great video! Mustie is the best! My first bike was a Yamaha 360 enduro mine was a burnt orange color. My mother forbid me to have a motorcycle. I had to get some parts machined at the local implement dealership and saw it sitting in the back room with a blanket on it. Well I made a deal with the owner and I ended up taking it to my buddies house. Then one day a couple of weeks later my mother saw me riding it around town. When I got home she was very pissed. Told me I was grounded for a month. But my father got her calmed down and the next day I brought it home. I was fourteen at the time and the bike was a little big for me but I had a lot of fun!! Good times and good memories. Thanks mustie!!

[@Evan-st5df]

My mom vetoed the motorcycle, too. "Not while I have anything to say about it."

[@chillywilly3397]

You are by far the best shop instructor on KZbin. Thank you for your tutelage and dry humor. It needs lube. haha

[@captnmike597]

After hearing hundreds of Mustie's "Nut Jokes" and "Lube Jokes" and "Getting a Large Rod into a Smaller Hole Jokes" I would hardly call it "Dry Humor". I laugh like hell though.

[@chillywilly3397]

@@captnmike597 I'm glad that you got a laugh out of it.

[@Greg_Watchorn]

Hi Mustie1- I just wanted to send you something small to put towards tools or a yard sale purchase or whatever. I'm not a mechanic, but grew up on a farm and always enjoyed time spent with my Dad - I nicknamed him MacGyver as he is always tinkering with something or other - usually re - purposing something or other into something else. I really enjoy your videos, particularly the variety of things that you work on. Thank you very much for all you do, I really look forward to your new videos.

[@toxin911]

thats funny, i was given the same nickname name as well as Dr. Mopar lol

[@DonniePresley-db8le]

😊​@@toxin911

[@echobeefpv8530]

I hope that neck problem gets better, not much fun working in pain. Take care, thanks for the video.

[@associatedblacksheepandmisfits]

That zorst sound takes me straight back to '79 in Edinburgh, sliding on cobbled road right infront the local copshop..😂😂nice bike man.

[@deebee3901]

Awesome repair mate! Really loved seeing this old girl come back to life. Thanks for the journey.

[@DarrenVaughan-j6j]

Hi D. Really hope your neck feels better. It’s always great seeing you bring back old bikes and vehicles. Love the video. And as always, thanks for bringing us along!!😊😊😊 Darren.

[@roybruyn4818]

As a power sports tech the 75 on the old piston is 0.75 mm overbore. That is pretty standard for a first overbore. To get your correct size you need a 1.0 mm. This will allow you to hone it to size. As far as color difference on crank that is from them assembling crank at factory.

[@paulcooper9135]

Wanted to say the same thing ... I got caught the same way Mustie did ... 40 years ago I was used to the number refering to Thousandths over bore, but metric bikes like yamaha were mm overbore.

[@turboboy0]

i always disabled oil injection, re-jetted the carb and ran pre-mix in the tank. too expensive when oil injection fails and you don't know it in time.

[@michmvp]

I had a 250 Yamaha and watching you ride the 350 through the woods reminded me of when I rode mine on old logging railroad grades in northern Michigan 50 years ago. The good old days.

[@markeder4208]

Mustie1, I bought one of these in 1977 on base, transported it to San Angelo's, TX and then road it on the freeway to Tulsa, OK! With all my gear on full knobbys. A Beast! Sold it in Florida. Yes, pretty Torquey!

[@jamestaylor7746]

I definitely appreciate the extra explanation. You quickly and concisely explain the “why” of your diagnostic hypothesis/process. Not spending too much time on it for those who know those “common sense” things, but explaining the complete reasoning to those new to the thought. I’m also impressed with the abundance of spare or usable substitute parts you have to replace needed damaged parts no matter what you’re working on. 😮😊. I guess, even more impressive is that you’re organized enough to be able to find them.

[@vandalsgarage]

I lived on a Yamaha enduro 175 when I was in high school many years ago. I loved that bike.

[@benkanobe7500]

I have been a Mustie1 subscriber since just about the time there was a Mustie1. I have only one complaint and that is he does not say where he gets his parts or the brands of the parts. Is that Yamaha Piston, a Wiseco, .......? What was your source? Some of us do what he does and so would really appreciate where he gets his parts. And he gets some amazingly hard to find parts!

[@benkanobe7500]

A lot of what you are hearing is just how a Yamaha big bore single sounds. That "ringing" on deceleration is completely normal. (I had that exact bike I purchase brand new. Ran it for 27,000.0 miles before I rand the injection pump out of oil. New piston and rings from Yamaha and a bore job gave it 11,000.0 more miles and then I sold it.). Amazing motorcycle. Almost unstallable with the big bore and reed valve system.

[@1tristan1henderson1]

Welcome back Mustie fans. Hope you have a lovely Sunday. And thanks Darren, we appreciate all you do.

[@dansonthetube]

Looking forward to this one later today! 🥳

[@perrymattes4285]

We understand you have a life But really enjoy wrenching with a coffee on Sunday morning

[@MakerNoKY]

@@perrymattes4285 I have a ton to do today, but the notification popped up while making coffee. Mustie Coffee is my favorite way to start the day.

[@MakerNoKY]

Who the hell is this Darren Guy you speak of? LOL

[@aib0160]

I think it'll be a big mistake not to address the issues of the bottom end now.

[@bobacmc1]

Hey bud, thanks for your weekly vids. Watching your stuff is usually a fun part of my Sunday morning. Especially love when you’re tinkering on the old air cooled dubs.

[@josephsimanski3192]

Love the ear protection, safety third 🤙🤣 Good morning Mustie, thanks again for your awesome content!!

[@tannert6597]

Vintage two stroke dirt bikes are always my favorite rebuilds/videos. Always a great way to spend time learning and reminiscing on a Sunday.

[@davidbiloen5037]

Respect Darren, I must admit when I saw what you were doing I was really sceptical about how it woud run, that piston seems way too small and the single ring way too feeble, but it actually sounds pretty damn nice, and more importantly you seem to be having a blast on it.

[@senorboardhead]

That is the one for you ! Do the bottom end and overbore the jug. Those are awesome bikes to ride and carry a very good resale value. Worth the investment. Maybe it will be delayed, but parts have to be out there - so many are being restored. You gotta do it. Awesome combo bike. Fun on the street. Has some balls. Hey - it’s always fun and informative to watch.

[@maxwilliams426]

I use a leather belt with small vise grips wrapted around around the piston with oil on the piston. Won' scuff piston and easily removed after ring is into the bore. Use smooth side of belt against piston. Has worked well for me for several years.

[@brucepeebles4939]

You mentioned being able to stop by local Yamaha dealer to buy a piston. I was about 12 years old when I took a piston to the local Yamaha dealer.... for $15 I came home with new piston and rings.... was riding that afternoon. (Only had to mow 3 lawns to pay my Dad back)

[@oboewankenobo8675]

Used to work for a bearing company years ago. Those small bearing assemblies were called needle bearings. The retainers that held the needle rollers were called cages.

[@tomperry1048]

Greetings from Sydney NSW: By any chance, was the packing called 'grease' ? No need to thank me mate.

[@damrellbob7914]

I hope you are ok i know you have been having problems and had to go to the dr for migraines i really miss your projects i wait every Sunday for them . Prayers brother

[@MellowYe77ow]

He dealing with another health issue right now. (Kidney stone)

[@sonovoxx]

Yay! Good to see you back!

[@johnh8268]

My dad had this same bike in the same color. Man, does that sound bring back the memories. He's gone now, but seeing and hearing this reminds me of some great times riding with him on my little Yamaha 80. Something in my eye now.

[@U.P_SCUBA]

Is any one else screaming helicoil at their scresn, any thing to avoid metric 😅 love your work.

[@amydave2744]

Yes! Must not have any I guess

[@josephdangelo1503]

Hi musti 1, I remember those old 360s what beats they were. You know I don't know if you're ever even going to fix it right or not but if you're not you probably ought to sell it to somebody that will that's definitely a piece of history that needs to be saved completely. Other than that I thought you did a pretty bang-up job, which is why you're the original KZbinr. No sponsors no merch just plain old KZbin❤

[@DoRC]

The engine will run slightly more lean if you're running premix through it but really it's not that much of a difference. 50 to 1 premix is only 2% oil and Don't forget the oil is also burning so it's part of the mixture as well. Overall you might be seeing a 1% difference in the actual mixture which I don't think would really be noticeable.

[@LostMountainRestoration]

You stoned the cylinder and then put in a smaller piston?

[@Supertech-86]

A happy piston is a slappy piston -cars and cameras lol

[@robertheinkel6225]

I was wondering the same thing.

[@JoseSilva-dl5te]

The 70's was always open.. I miss you. Sunday afternoon a thousand girls wanting to go for a walk. I had a friend, I had the 175, we did races. We had fun. I want to go back in time😎😎

[@joeno215]

Had an IT175 that had the same noise in the engine. It ran tor years with no trouble. Nos parts now carries misc parts for old motorcycles

[@Boris77674]

I bought the same bike when I was 16 and loved it. It was in much better shape but I have enjoyed watching this bike get up and running. Thanks

[@stoptheirlies]

I can't believe you put that engine together with all that piston slap let alone the dodgy big end bearings! I doubt it will last long.

[@bigjay6743]

Yeah he knows that don't think he cares. He made the video and that's all that matters. Like he said it's almost impossible to find the parts for this bike. The crank's got a little bit of play. It might last a week or maybe a couple years who knows.

[@Clearanceman2]

The show must go on. It's video time. I'm sure he'll have the jug bore another time or if it ruins the bore look for another. I hope it doesn't ruin the bore.

[@DaneSaysStuff]

There is more than just that wrong with this video. This is an exercise in all the wrong things.

[@Clearanceman2]

@@DaneSaysStuff I guess. Musty is a great old school mechanic and the thing does run. Just wish he had done it properly since these things get more and more rare every day.

[@DaneSaysStuff]

@@Clearanceman2 Playing fast and loose with the word mechanic. Although that's been a trend on YT for a few years now. I agree it would have been nice to see everything done properly. That's why I came here to begin with. None of it was impossible, just slightly more difficult.

[@richfletcher4286]

At 23:30, in the 6 o’clock position, is that cylinder head cracked?

[@Fatterpilot]

Morning, everybody!

[@jimmyeatshoe]

“I’m taking it easy ‘coz of my neck issues” **pops several wheelies at the end** 😂 Been watching for maybe ten years religiously every week. Best channel on KZbin. Thanks Darren! 🎉🎉🎉

[@stickyfingers2413]

yes.. especially with that ISO-certified cloth helmet

[@briansantefort]

I'm almost sure Vintco makes a top end and Crank kit for those 360's!

[@throttlebottle5906]

head gaskets, round copper ring and indexed gasket both "NO". they mixed years of parts and that's an enduro head, with deeper dish/lower compression. (vs MX bike). both gaskets are an no-no, different years mixed etc. unless pistons/rod wasn't stock length/height! none that I knew or know of. if I recall the the larger multi-stud-hld gasket wa s.020 thick and the solid ring was 0.030? ( I may be wrong, it's been about 30 years) lol

[@andreasbenning]

When installing the cylinder on a two-stroke I usually compress the piston rings with a zip-tie, when it's slid down enough so that the rings are in, just snip it off. Have always worked well for me. Have only dealt with pretty smalls engines though, if that makes any difference... Thanks for uploading, always educational and entertaining! Greetings from Sweden

[@Leon-vp3vb]

Mustie, you are one brave man, running 360 without muffler! Camera does not do justice, to the violence coming out of that exhaust port.

[@billytheearthworm573]

☝️🤠 More Compression, bigger rear sprocket, improved Expansion Chamber, and Meat Eater/Mountain Climber Stickers 😮

[@kevinvt4174]

I owned a Yamaha 360 just like this one, in the extra plug hole I installed a manual compression release it had a small lever on the handlebars . Mine new from the factory had a lower end that made a lot of noise also and as soon as you kicked it over the sound brought back so many memories.

[@azurplex]

It’s a shame the bottom end gave out at the end. Hopefully you can find crank bearings somewhere.

[@albinklein7680]

Those are standard bearings. You can find them by number or dimensions in the normal SKF, Kogyo or FAG catalog. Don't know how hard it is to get those outside of Europe or Japan, though.

[@nunyabidness9895]

Happy Sunday Mustie! Good to be wrenching with you....doing my best to lend a hand and not get in your way!

[@phildunne2632]

I swear I could smell the 2 stroke!

[@dantheman6698]

shame about the bottom end, hopefully you can find a new bearing or whatever for it. i was thinking the same thing you were about it not reving up cleanly, it needs jeting down then it will rip hard :D

[@ruaraidhmcdonald-walker9524]

First thing to do is stop thinking in inches when working on metric bikes…. 75 on the piston is 0.75mm overbore. That’s a lot of thous!!!

[@DWr_UK]

Err have you got something against Helicoils? I've fixed lots of shot threads with them, never failed yet...

[@Yamahaoutboardguy5090]

The colour difference on the rod is some sort of hardening Yamaha does from the factory. All Yamaha rods have that colour difference even if they are brand new

[@paullienhart7231]

DUDE THAT IS THE COOLEST BIKE EVER, I HAD ONE PLEASE DO FULL ENGINE OVER haul👍

[@dankeyes2669]

How bout disconnecting oil pump and mixing gas

[@Cartier_specialist]

I've never used a ring compressor on a 2 stroke top-end rebuild and I've done quite a few. Of course I never did a 360 either.

[@markcropper7182]

i now that the big end bearing has wear but that noise sounds more like piston slap air cooled big bore two strokes can also rattle when the rubbers between the cylinder and the head fins is missing or worn with age

[@preez77]

Correct. That’s a piston skirt slap

[@Ghettochappy]

Yes definitaly piston slap!

[@robwaterfiled6168]

funny moment when i was resurrecting one of these, the magnets in the rotor/stator or whatever its called were broken so tried to get a replacement, couldnt get one but had one from the 250, it was different so swapped the magnets from one to the other and it fired up immediately, clicked it into gear and most unexpectedly it ran backwards, rearranged the magnets and it worked properly from then on lol PS if you grind a bit off the exhaust flange where it hits the frame it'll slip in easily

[@larrymoore2792]

As a motorcycle mechanic of many year, I have come to know that the piston skirt is what should be measured to fit the bore as the ring grooves are just a bit smaller.

[@nerd1000ify]

Yes, because the top of the piston gets hotter than the bottom! You also should measure perpendicular to the pin bore, as most pistons are slightly oval on the skirt and will be larger in that direction.

[@imo7270]

Two strokes quite often have a little 'piston slap' as they wear. But with an already undersize piston this one unfortunately sounds like it has far too much.

[@craighansen7594]

I had a lot of junker dirt bikes when was in my early teens. My first really nice bike was a 1974 Yamaha DT100 very similar to this 360. Never should have sold it.

[@LAP1050]

The Enduro 🏍️ rips again. That’s all that matters and we enjoyed from afar. As always thanks for sharing Darren 👍🇺🇸

[@carlbernard4197]

You have to figure out why it won't Rev properly with the air cleaner in place. The bike sounds great! Seems like is doing its thing properly.

[@charleshemsley4149]

Thanks Mustie1 for bringing back fond memories of me growing up, tinkering on dirt/trail bikes, the smell of 2stroke in the morning, riding with friends all day in the bush/beach/pine forrest.Great days. Cheers, Mate, from Australia.

[@tonyking3125]

Well, she's definitely on her way out with that rod. Sell it to an Democrat, they'll buy anything.

[@robedmunds7163]

Some of that noise is piston slap. Is it possible to get the crank rebuilt, then you would have a great bike.

[@taurota1554]

Welcome back.Awesome as always.Thanks for sharing and taking us along

[@fascistpedant758]

I'm glad you took the time to tighten your safety cap. Safety First! My brother had a 175 back in the mid '70s. It was great for a kid my size.

[@DavidWilliams-rn6uq]

Mustie, just a note if no one else has chimed in - Yamaha uses a copper head gasket that can deform a little, what you were calling a shim really is the head gasket. The thickness of that gasket can be changed to set the clearance between the piston and the “squish” portion of the head. Too large, you lose compression. Too small, the piston might smack the head. The 100cc Yamaha KT100 uses a very similar setup with a single-ring piston. Edit - I see there is a full copper gasket in addition to the shim, missed that the first time. The shim must really be just that - a shim to adjust the squish.

[@chrishartley1210]

I came here to make a similar comment. The ring did not appear to be a shim in the traditional sense, rather a filler to reduce the squish volume. Perhaps it was added to try to compensate for the failing compression. In any case with a new piston with a different profile the original squish calculation would be completely useless. The noise in the closing seconds of the video tells me that the bottom end is totally wrecked.

[@jimtitt3571]

​@@chrishartley1210No, the ring is the head gasket for the MX engine which uses a different piston.

[@chrishartley1210]

​@@jimtitt3571I looked back at the first part, the ring isn't where I thought it was and I assume it is the squish shim for the MX360. I'm guessing that the replacement piston is from a DT360 which had only 30hp compared to the MX's 39 and the majority of the extra power would have come from the squish. I'm concerned that leaving the shim out could have brought the piston closer to the head although the replacement head gasket could also be thicker. If the piston and head are closer then with all the play at the bottom end they could now be making contact at higher revs.

[@jimtitt3571]

@@chrishartley1210 No quite, the MX version pistons didn't have ports in them and different cylinder porting which gave them more top-end power, the trail bikes used the ports in the piston to increase the torque at the expense of outright power. The downside of the ports in a cast piston was they had an unpleasant habit of dropping the bottom of the piston into the crank if you rode them hard. The MX engines also struggled a bit on cheapo pump gas as the compression ratio is considerably higher. You see this with kinda pitting on the exhaust side of the piston crown and excessive wear down the front (exhaust) side of the piston as it all starts to overheat from detonation. Measuring the deck height/ squish band is essential for strokers especially if the piston isn't original. Re-jetting because it runs rich is also a mistake (apart from altitude etc), the stock pipe is double-walled (for sound reasons) with the internal layer being perforated, once this is clogged with carbon nothing works properly. Burning out helps but the only real solution is cut the pipe open and rip the junk out completely.

[@chrishartley1210]

@@jimtitt3571 Interesting, that means that the piston that came out, which had ports, wasn't an MX piston. Need to look at the frame/engine prefix, if it begins with 446 it's a DT, if it begins with 365 it's an MX and someone has messed with it already.

[@LucyZamb]

Go with a pleated filter like on a lawn mower ....I had to do this on an old Enduro 80 one time...or just replace those crank seals...and be done

[@bryanmoskowitz8976]

Checked for parts. eBay 2 parts only engines. ~300 each. Amazon parts you bought. Then I went to Yamaha website. Certain parts available but local dealer stock depending on what it is. Used 1974 date but many models so don’t know. Compatible list maybe somewhere ( someone, somewhere)but I know nothing about anything. Checked because who knows.

[@Supertech-86]

Surprised YT didn't chastise you for being too helpful.

[@bryanmoskowitz8976]

Was just for yucks. Just before watching 2 vintage. Sometimes shit happens.

[@bryanmoskowitz8976]

Checked comments someone else googled D360. Parts came up. Crank and bushings I think. Don’t know model or serial number or whatever you need for parts. But I think they’re out there. X files.

[@fveggerby]

Dude, I thought you were dead. If Mustie1 fail to put up a video, the whole world falls apart. My world, at least. ;)

[@ConcreteMan99]

please re-edit

[@michaelweems679]

Why would you think he was dead? There was a video last week.

[@fveggerby]

@@ConcreteMan99 Why? Is humor, sarcasm, irony not in your vocabulary or library of understanding?

[@jjj7665]

Great video I have the same bike unfortunately the oil pump was putting to much oil out so I have done away with it and just use premix, well done . We do not get many 360 in the UK.👍

[@timothyabraham2228]

Has his hat on backwards mentally went from current age to 16, "c'mon jimmy, eric lets go hit the trails and do some jumps"!! 😂 lol

[@mrspof]

Mentions neck injury, proceed to pull wheelies. Never change and thanks for the vid!