I Should NEVER Have Done This- YZ250 Top End Rebuild (Part 1)

It was about time that my Yamaha YZ250 got some work done to it but this is NOT what I was hoping to find while changing the top end!
📷 SOCIAL
Instagram- / chaos_causes_
📽 REDUCED CHAOS (My second channel)
/ @additional_chaos
⚙ MY KIT
Main camera- amzn.to/2TU3On2
GoPro- amzn.to/2V0jtSh
Insta360 One X2- amzn.to/3h3hevL
Insta360 One R- amzn.to/34HcdCw
Gimbal- amzn.to/3eHVkeo
Main Mic- amzn.to/3ujNEpq
Lapel Mic- amzn.to/2NVtRc5
Audio Recorder- amzn.to/2E647pp
🎵 MUSIC
Epidemic Sounds- www.epidemicsound.com/referra...
📧 BUSINESS INQUIRIES- [e-mail]

[@Trac480]

Haha, I was debating doing a "how-to" video on some of my bike mods/changes, then I realized it would just be a "how-to" video of someone watching a "how-to" video... someday maybe.

[@morley3810]

I loved your video, I appreciate your attitude and humility. Having owned a 2016 YZ250 since new, I would suggest that your bike had much more than 91 hours on it. I just did my most recent top end at 212 hours and my cylinder still looks amazing and there is no power valve shaft wear to speak of. I did put my hour meter on before I ever rode my bike, I suspect the previous owner of your bike did not do that. The hour meter of the bike has 91 hours, the bike has significantly more. Anyway, its a great way to learn. They are relatively simple machines and parts are easy to get.

[@hercovandeerve7296]

Glad to see that bench is getting dirty. Was just thinking about it earlier today. Good on you for doing it yourself. Learning is an adventure too. And the so called professionals mmmhh. Don't have much faith in the either 👍🇿🇦👍

[@cuannell2143]

I might be getting a 250 in December! Lets just hope I get good enough grades🙏👍✊

[@tagecarlsson4942]

Good luck man🙌

[@cuannell2143]

@@tagecarlsson4942 Thank You! 🙌🏼

[@scoota7509]

My fun was a Suzuki RM 250. Love the power of the 2 stroke. Good smell as well. Tip. On an older bike order parts you think you may need. If you don't use them this time you will next time, especially if they are a known part to fail.

[@dizneyboy1756]

That's why you gotta shop my man, so you can take your time, learn and feel safe in your space! Would've broken half of my new stuff if I found what you found in the top end 🤣

[@AmgK.]

NGL this is kinda satisfying .. specially the out of focus part🤭😜

[@andreasdamen8182]

Awesome video man. I learned to work on motorcycles by fixing up my dirtbikes. And also started to work on my car after I gained some experience with wrenching. I recently bought an ER-6F from 2009, because I have my motorcycle exam next Tuesday. Now I'm fixing that up to finally be able to ride on the streets😁.

[@nishikaperera2988]

Finally content worth watching. Worth the wait

[@javierr1blue]

Dude keep learning keep going. The motorcycle world is amazing trust me. You will learn much more when you get things done by yourself. Keep a service manual nearby. Congratulation for the new shop. Keep going bro I will continuing watching from Texas. God bless you.

[@slyvagoes1497]

Its kinda good when you have two bikes, i have one and its the only way for me to get around the town and the gearbox is shot and it became a project and i became a walker :Ddd

[@Knautschfriese]

Very interesting. Ill wait for the parts, and your next Video. Have Fun with the Duke 😃

[@christopherhall2107]

Looking forward to the next video 👍 just got myself a YZ250 as well, never ever owned a 2stroke before, learning as I go along as well. Keep up the good work 🇿🇦

[@noquierounusuario]

Always liked the YZ250 , thats where it all got started for me.....

[@bradg2309]

Happens a lot waits any dirt bikes. Like you said before it was a smart decision to sell the crf250r because it would probably be even more expensive to rebuild. I have an 06 ktm sxf and it to was worse as I bought it with a blown cylinder head and destroyed valves. Best of luck to you my friend and can’t wait to see the next video.❤️

[@unenthusiast]

Not my kind of bike but still interesting to watch.

[@mickelillum7609]

Can’t wait for the part 2 video 🙃

[@strandschep5749]

Rebuilding a engine is one of the best parts of owning a bike. When your rebuilding it you might think its not fun at all but when i know what to do it will be much easyer and when u done you can say u did it al by yourself!!. U know how it works because u build it!!. And when u start it and it revs up... well if you build an engine u know the feeling of the first start (it never gets old)

[@harro9447]

I just went through the same thing as I attempted to rebuild my yz for the first time part it ended up taking 3 months waiting for parts and a few of my stuff ups definitely worth it in the end

[@B18CXr]

Excellent dertdevice video, keep them coming. Braaaap!!!

[@azrilrapaiee]

wow...you.came from long way journey...now this chanell provide more and more knowledge

[@2strokerides]

Did my first top end rebuild 3 weeks ago. I know exactly what you're going through🤣

[@kavin-he8ep]

i love your videos!!!!

[@supernaturalgamer6577]

Love From India 🇮🇳

[@RovingAfrica]

Good stuff man love the videos. Gonna go ride my bike in CPT in a couple of weeks would really love to know where this cool single track is so i can ride that :D thanks! Keep it up!

[@jameslockyer9796]

Just a heads up you will have difficulty getting the piston back in the calender because of the piston rings (you can buy a tool to make the job easier but it is designed to be used when the engine in not in the bike frame but may still work)

[@nicklabelle9573]

You order a new shifter not the shaft correct? That aluminum shifter is more likely to strip than the shaft. You could make that one work by making the gap bigger with a grinder to allow more tightening, but new shifter is definitely a good idea. Put lock tite on your new bolt in you’re new shifter and tighten it on good it shouldn’t loosen for a while.

[@nzwakele]

Consistent w/ the content

[@mrmr3621]

first time viewer , nice editing and over all video

[@akumaneo7217]

I love your videos

[@dr.hugog.hackenbush9443]

You'll be able to do this in your sleep after you do it a time or 2. Hot tip-for longer engine life, get your cylinder sleeved. It is faster to bore and hone a cylinder then waiting to get it replated.

[@matthewjansen5118]

Liked before watching because I can

[@GarageAddiction]

Soon you'll be doing full rebuilds like a pro, learning is half the fun of wrenching!

[@stevehartwell1861]

Book says 20 hours under race conditions and 50 under normal riding. Ignore at your peril. Buy the factory service manua and use it.

[@logannowak4010]

I doubt it’s the shift shaft spines are bad it’s probablt the soft aluminum shift lever spines.. just replace the lever first to see if that fixes it.. put an extra long bolt in with a nut on the other end to make sure it stays tight

[@DBolt-xb7sg]

Can you port the cylinder head where the chip is? This just involves chamfering the area?

[@erikoltmanns4568]

Looking to get a yz250, how long does the stock tank of gas last?

[@philthy63612345]

Nice video, I'm glad you tried it yourself and not just send it in to be fixed. Gear lever is aluminium so it will also wear first to protect the shaft, happens alot.

[@nrxgamingukii5427]

My dude camra getting bored of its owner looooool

[@StraightLineCycles]

I had my cylinder resleeved by Hill country performance in texas.

[@vankuikendavid8453]

? shift shaft looks OK the shifter is designed to fail first from not keeping it tight, also the bolt has to be completely out before you can pull shifter off

[@3rKoPlaysMinecraft]

Something must have happened to a the previous piston, right? Or is a chip in a cylinder common?

[@jamestestarossa7870]

Just weld the gear lever on ;)

[@dmartinr41]

shit I have to wait. invent a time machine

[@joaorodrigues8706]

This comment it's probably be late, but you can grind the shift lever in the middle to tighten a little bit more, sorry for my bad English, I like your vids. 🇵🇹👍

[@billbkr32ify]

That was probably a casting flaw and not a chip. If chipped off, it would have scratched the cylinder.

[@pascalw.paradis8954]

These bikes come with hour meters ? Yummy make great bikes ✌️☮️

[@lucaseaston]

This probably isn't the first time its been apart, from the look of the head nuts its been apart before.

[@Stefankr.23]

Early gang

[@motocraziness2024]

Hello my friend,would it be possible to use this in my compilation too?Full credited for sure.Thanks

[@Vaxzuv]

“I’ve been riding it slow and not revving it out a lot” that’s the worst thing to do to a stroke u need to rev them out so the piston and top end and all the bearings/cylinder stay lubricated from the oil in the gas

[@cw3728]

The manual states the piston rings should be replaced every 7.5hrs lol.

[@megapet777]

Well I don't think yz 250 has that little piston, when it has the same cylinder size as R1

[@mathisk5605]

Thema Diameter doesnt really was much about Thema CC ITS also about The stroke

[@megapet777]

@@mathisk5605 I have no idea what you just wrote.

[@gixxer259gp]

@@megapet777 let me take a stab at what he was trying to say... I think he was trying to say the diameter of the piston doesn't matter but you need to consider the stroke length. I don't think he realises that yes it's the same size cylinder and probably a very similar stroke length. He probably forgot that the R1 has 4 pistons to quadruple the engine size. Also the R1 stroke length is probably very short as with most high revving engines so not sure also what he is on about 🤣😂🤣😂🤣 I'm guessing that the stroke length is similar so please don't shoot me...

[@megapet777]

@@gixxer259gp Yeah :D either he was high or he doesn't speak english very well. I'm pretty sure yz 250 and r1 has quite different piston diameters and stroke length, but I'm not sure how those affect performance. I have to say I have been always impressed how reliable and low maintenance big sportbikes are. R1 produces about 50 hp from 1 cylinder and basically doesn't need engine rebuild ever. But 250cc enduro bikes needs so much maintenance (and basically any motocross bike regardless of engine size). I wonder why.

[@Jay-zd9kx]

Big bore kit

[@RVMOTOVLOGS]

Cycopath video 🧟‍♂️

[@keamations1648]

hi

[@zunaidkajee4540]

Hey bud, I have been following you for a while, and needless to say, I love your content. I just can't get used to you using foreign currencies. Come on broer, don't let us down like that. when we watch every other you tube video, we South Africans have to do the conversions. Let the rest of the world also do calculations.....

[@steven-vn9ui]

I don't mind changing my oil and filter every 2500 miles but change the piston that often? Can anyone explain why the dirt bike needs a more rebuilds than the average 2T road bike? I must be missing something silly here

[@ChaosCauses]

An MX bike is a full on race bike. Compare it to something more like a MotoGP bike that isn’t meant to do a whole season on one engine. They aren’t intended to do lots of miles on the road. They are higher performance but as a result require more maintenance. 🤷🏻‍♂️

[@reincarnated5594]

Ok ...but manufacturers in motogp dont just look at the bike after the race and think "oh yah we will change engine now"

[@reincarnated5594]

@@ChaosCauses and they are also limited to 7 engines per season and a season has 19 races ..not fighting just curious because it seems like a waste of money to rebuild the top end every few hours ..motogp manufacturers dont even service the engine since it is sealed ..i really dont understand why people rebuild it every hour

[@chrisvids1820]

@@reincarnated5594 I think only expert MX riders need to change the top end so frequently. One reason is that some racing pistons have only 1 ring. Less friction but once they wear out the power drops. I've got a 1996 KX250 with the original top end. While it's spent most of its life in a shed, I've ridden it quite a bit. It has great power.

[@rawcircoking]

I say it depends on how you ride but it's always good to be on top of things

[@marekedit3920]

this oneal helmet is sooo big

[@jdirt1982]

The best mod I do on a new bike is not get a hour meter then I don't know what the fuck and give it to some ass hammer when it grenades

[@TravisHollandMoto]

91 hours… hell my 300 has 365 hours on it.

[@vinceedwards3978]

I hear what you are saying, but it really isn't that hard. Also, 91 hours before a top end rebuild is a lot for a 250 2 stroke. Iearned exactly like you are now. You can do the work with just an owner's manual.

[@proto7688]

Ive got 250 hours in my yz250 .... This guy is looking for problems

[@hazcat640]

Wonders why gaskets on engine are leaking ... uses pressure washer to clean bike. 🤔

[@RovingAfrica]

Good stuff man love the videos. Gonna go ride my bike in CPT in a couple of weeks would really love to know where this cool single track is so i can ride that :D thanks! Keep it up!