A Problem With My CR250 Engine Build!

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The CR250 engine build started today but I ran into a problem that is going to hold things up for a few days.
-Cameron
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[@CameronNiemela]

Who's excited to see this engine go together?

[@OriginalAuttin]

Cameron Niemela Keep making vids, they are dope and they are really helping me build my engine right now. 😀

[@dragoslavpetrovic3616]

I am

[@johnybrug5406]

me

[@brncek3302]

I´m so excited to see how this engine will run on the bike :-D XD

[@zackmcguire3837]

Cameron Niemela I wanna see the whole bike together

[@rmatvmc]

Solid Work! Can't wait to see the end project-Chase

[@ZieglerMonster]

Love you guys

[@randywetzler5976]

Great job Cameron! Good to see someone on KZbin doing a rebuild like a true professional. Notice how clean the engine parts are and how organized and patient he is going through the process. Video/sound quality also excellent!

[@gabewilliams5993]

Working on my 99’ KDX200 engine. At 15, I’m not very experienced, but due to your videos and a manual... I’m on my way to a successful rebuild and an even more successful bike. Hopefully...

[@aussiehonchar3606]

Gabe Williams I rebuilt my 01 kx 85 from the ground up at 13 ish and rebuilt a yfz 450 top and bottom end at 14 and now working on rebuilding my new 88 kx 250

[@AvrageAndy]

Did you ever finish it

[@evanhord3038]

This bike is gonna be killer!

[@demolitiondaz22]

I think it is already DEAD on the table.

[@daviddefortier5970]

Wow! This is the only channel ive seen where everything is done step by step and each step is explained. Ive searched youtube for months trying to find this.

[@melissagross3180]

I really enjoy watching the level of detail you put in rebuilding these bikes. I am looking for a 2000-2003 CR 250 that I can restore for myself

[@supermototrolls7344]

This is some outstanding work Cameron! Can't wait for new videos. Thanks for video taping all of it and explaining step by step. Now I perfectly understand how the transmission works! Keep the good work coming!

[@stuminati7614]

Love your videos! Longtime removed from this sport which I grew up participating in. This reminds me of when my Pops and I would prep my bikes before amateur races. Wasn't uncommon at all to do this type of work after the season. Grew lots, turned to basketball which paid for school, now I'm a web dev. Your channel has inspired me to start looking for a bike and get back to enjoying what I always loved doing most - ridin dirty! Keep up the good work my friend, it's well received.

[@gordonwbell]

Sweet build! I blew up my 10’ husky TE250, so it’s getting rebuilt by a shop, the next time, I’m going to try it myself using your vid as guidance! Great job.

[@johnbee1069]

This is just pure awesomness! I've enjoyed most all of your rebuild video's but this has got to be one of my favorites by far.

[@shawn071]

So awesome man!, I haven't rebuilt an engine in over 22 years it was a 350 small block in my 1971 blazer, I love watching detailed engine assembling like this! Your CR is going to be bad ass!

[@AuMechanic]

Good job you checked the shaft end plays. Another tip, take pics during dis-assembly so you have a reference to look at putting it back together. Take gears off the shafts and lay them in a line as they come apart, like the parts diagram exploded view, and take a pic of them. If you loose a part during cleaning it'll be apparent when you look back at the images.

[@AuMechanic]

I know, that suggestion wasn't for Cameron.

[@Lando94]

I didn’t know what day it was but I’m excited now too two years later!

[@Salah.Alleroy]

Brooo! This probably the best KZbin channel, i really love what you do, I've been through all of your videos and they are amazing, alot of things to learn from you.. I appreciate what you do buddy, n i can't wait until the CR engine is complete.. All the support and best of luck 👍👍💪

[@hatemsgarage]

About to tear down my 2005 CR250 for an engine build this fall. First time doing a lower end, so I know this video will be a HUGE help!! thanks man

[@faizashrafabdulrahim8609]

Im always enjoy studying about engine parts and to see someone whom very passionate of having his work done like you is so inspiring. Keep the good work bro! And get well soon! From Malaysia with love 👍

[@stororadio8713]

These videos are addicting. Its amazing how clean you get everything!

[@don7406]

Thanks for showing the resplitting of the cases. Mistakes happen and you handled it perfectly. Real world stuff here.

[@4nydrrsdanny846]

Man what you do has no name, you do it like no other, amazing!

[@augusto5266]

Estou ansioso pra ver essa cr funcionando ✊

[@DethStrike121]

One of the first best video on a 2 stroke engine rebuild!!!

[@garybyrne2605]

You make this look incredibly easy.Great video certainly something to look at for anybody assembling a motorcycle.

[@frankcrawford416]

What a nice down to earth video. Reminds me when I rebuilt my 78 Yamaha dt400 transmission.

[@ATVRIDER676]

Love the videos Cameron, I’m currently rebuilding my 04 CRF250R from the ground up and all of your videos are super helpful!

[@jeandebeer5470]

Thank you very much for this great video. Im about to rip into a crf 250. Some of the gears are slipping. You just boosted my confidence. I love your great quality videos. You are an inspiration to everyone who is ready to accept it.

[@r6chrisk]

Very professional and honest, I’d let you rebuild my engine Cameron. Thanks for sharing

[@brainstain22]

Cam I literally had the exact same problem building a cr80. Same washer. Its together now thankfully. Thanks for sending the drive chain so quickly. I Couldn't be happier with your store. 🤘

[@CameronNiemela]

That’s great to hear! Thanks for your business Brian.

[@SM-vq2vs]

i watched this video before tearing my kawasaki's down end for changing main bearings and seals. i was kinda afraid for that job... But that was the easyest job that i have done. it took me 4 hours to rebuild the whole engine.

[@Enjoyeveryminute2023]

Thank you for the video, I just bought a 2004 crf250r and i found out yesterday it needs to have a new crank. I’ll definitely be using your videos for my rebuild once I can afford parts

[@rbljackson]

Great detailed video!! Thanks so much. Ive got to get my RMX250 back together...its in pieces. A buddy is helping me do the work because I have never split cases before. I had a bearing go out, and she starting smoking REAL bad...hopefully sometime this summer we can get to work on my own rebuild.

[@riderrm2505]

That is a great video! I love how you always show and explain each step very clearly.My son is going to be rebuilding his 2004 yz250 bottom end this summer.👍

[@superdon1chw]

THANKS FOR SHOWING YOUR SCREW UP AND TOTAL HONESTY,really

[@chrisarmstrong7678]

Get her done right. So exited to see how this bike will turn out!

[@gerocolde]

Amazing work cameron. Really clean and professional. Thanks for all the useful information

[@nomdeguerre13]

An inspection like you mentioned would have showed that... Even the best make mistakes Cameron. You could have pretended it never happened... I appreciate this video big time as it has taken the intimidation out of a bottom end rebuild that I will be doing to exchange faulty 17 cases for updated 18s on my 17 250sx. Thanks man and enjoy your Rocky Mountain weekend. I would go, but stuck working.

[@AuMechanic]

I'm relieved to see you're using the oven for the casings. And yes you need to drop the bearing in the second you get it out of the oven or what happened there with the bearing sticking out will happen. By the time you pick up the can of cooling spray and use it that cases will have cooled too much, it should be fine without the spray so long as you don't hesitate putting the bearings in.

[@mt1885]

What kinds of coolings sprays can you put the names here?

[@inoahmann7542]

@@mt1885 Computer duster works well if you flip the can upside down. You could also use liquid butane or propane.

[@mt1885]

@@inoahmann7542 THANKS on the replies - I will try that out!

[@sandmanbub]

@@mt1885 Try a CO2 fire extinguisher.

[@demolitiondaz22]

Are you really that stupid using highly flammable gases ? why not use Arctic spray . More commonly known as liquid Nitrogen in an aerosol.

[@freakonaleash235]

Love the videos! I wish that this had been out when I put my yz back together. You have some really good pointers. Keep up the good work!

[@braapp6818]

Damn the engine is lookin fresh!!

[@Micscience]

Really good job. Most engines don't get put together with this type of quality.

[@CW-up7xv]

Dude watching those bearings go in was amazing. I've never done anything but fight them.

[@moderatefkr6666]

You do good work dude. Very meticulous. Great attention to detail. This engine will be way better than when it left the factory for sure. One thing I do is locate the gasket with the case bolts. Often it's not necessary, but on those few occasions when the gasket isn't a perfect fit, this helps avoid the bolts catching as you fit them blind later. I've known a gasket to get pulled out of position and then break at that point.

[@Thundercat68]

Amazing attention to details. Excellent video!!

[@theshedgardeners7722]

Awesome video as always, can't wait to see the finished bike

[@ftball90]

Another amazing video! It’s finally coming together! Excellent tip on the grease and the gasket. A dab of oil works well also. I use this method for all gaskets in the motor. I hate scraping baked on gaskets.

[@TheAefril]

Thanks Cam' your video is worth so much to me! I would of wasted endless hours through trial and error to get the parts of my gearbox fitting together. And you give great little tips along the way - to save on maintenance, mistakes or do a quality job. 'A thousand thank you's' Keep the vid's coming!

[@airplanefan-zv5ew]

Awesome video. Your attention to detail and camera work is superb

[@waynesymes1338]

Your videos are awesome, have been considering doing this for a while! Just needed the push thanks man 👌🏻

[@truthberkley2610]

good luck buddy!!

[@waltermorgenroth7872]

That new crank looks incredible...

[@brandywell44]

Good call on cracking open the gearbox again

[@shortty7618]

You’ve helped me, and so many others so much. Thank you 😎

[@A1soldiersaint]

Hopefully with all the effort you put into making this beautiful, that you had the Crank balanced.

[@Beachnative42]

Awesome camera work on this project

[@davidrestivo8598]

That engine looks brand new. Nice job brother.

[@PolarMuNkEy]

Seriously loving these videos man! Thanks for all the tips and information!

[@johnanderson5212]

This video really made me feel more comfortable rebuilding my bottom end on my crf

[@mfmonthefmf]

great vid, crazy how the smallest oversight can be so consequential, first time I actually understood whats going on in my dirt bikes transmission, thank you!!

[@adolfosanchez9264]

Really really good job!! My congrats for you!! I've just discovered your channel and I recognise it's a tremendous job and dedication. Thanks for transmitting all your knowlegde, effort and passion. Salutes from Spain.

[@steve23464]

Production quality is top notch. Great instructional video.

[@zone47]

Awesome and very well explained. I'm hoping this will help with rebuilding my CRF150R. Thanks for all the great info!

[@alexvibornijs5713]

So professional and those good camera angles, love it!

[@MegaRudy07]

Alex Vibornijs m

[@BlackFragFilms]

The feeling of doing a full engine rebuild and installing the engine back on the bike just to realize that something is wrong with the transmission is pretty lovely. Happened to me when I was working on my ktm.

[@abrahamchacon6909]

Soo excited to see this motor run out

[@MrCalifornia1234]

I have a 04 crf450. Awesome work!

[@allenhodges836]

That's crazy how something that small like a little washer can hold the deal up and make something go wrong but it's good to know those things like you said double checking your work awesome can't wait to see the next video

[@thekid8245]

Awesome ! This is about the only thing I like with the internet today is tutorials Nice to see the heat and cold process Still being used today 👍 And seeing the brand Maxima still on the market one of the best products I ever used Gasket cinch is another if not mentioned later in video and still out there too

[@Micscience]

Thanks for referring us to rocky mountain very helpful diagrams.

[@kenbrake2828]

Dude, I've watched a few of your videos now and they are really well done but this bottom end rebuild really does simplify things! Thanks for the great vids man.

[@JP_Connected]

Another great video mate. The in depth explanations are brilliant and make all the difference ,👌

[@tuoppi42]

There are actual freeze sprays available as well. Dry ice is very good though, just remember to keep an window open and the cooler in the trunk while driving home from the supplier, co2 evaporating from the dry ice can make you sleepy in hurry. Good stuff, keep it up!

[@steviemunier8411]

I still love the fact that you did a Honda build!

[@TheAefril]

Goes to show you cannot skimp on installing a simple flat washer if it was shown on the manufacturers' exploded view of the gearbox. Thanks for showing us how the gearbox will bind when the washer is not installed too! You probably saved me from another headache or 'swearing fest' after I had put the box back together!

[@AlphaMotorsports915]

That's a Great Engine Stand. Nice Clean Work makes it Fun.

[@matthewjimenez-dl5wv]

Your so awesome bro I would never afford a machanic you gave me confidence to do this

[@pate7934]

Waited for this so long!!!

[@twosmoked1805]

Such a beautiful build spectacular process

[@gregparker8349]

When rebuilding transmissions it is very important to know that the thrust washers have a barely noticeable chamfered edge on just one side. Same with the spline washers and circlips that go on the shafts. The chamfered edge always faces towards the thrust load side of the gear or bushing. If installed incorreclty it will still seem to shift smooth and mesh correctly, but it could eventually cause premature failure or overheating of the components and anything they come in contact with. Nice build! I really like that engine stand!

[@steveplumb4328]

You are the best at what you do...very helpful vids

[@baydensmith5781]

Hi mate, you are thorough and you are doing good work. You should use heaps more oil during assembly and not that red rubbish you used! Use something mineral based thats no thinner than 15W. Just make sure it doesn't contain 'friction modifiers because of wet clutch. Get an oil can and squirt some into bearings and spin it in. Even the bearing housings before you tap bearings in, so no chance of damaging housing. Yes it's more messy. Wear nitrile surgical gloves. If it runs out onto gasket surface area use break-cleaner on a rag and wipe clean. You know what your doing, just use more oil. I know when you fill crank it gets in there, but we talking assembly here. Things bind and get air pockets and can repel oil for longer than you think. All threads, shafts, splines should be smeared with oil before you tap them in and before your gear/shafts cover them. Even thin smear of oil on the inside of housing before tapping them in stop binding and chewing of case and even knock down tension on case. The real tip I give you are sealed bearings that dont rotate much compared to wheel bearings. E.g headset, swingarm etc. Get a scribe and carefully pick out seal from the outside circumference only. Do both sides and use compressed air and blow that shit quality factory vaseline grade rubbish out. Buy some molibdimen disulphate grease and virtually fill it 80% full. You can do same to wheel bearings but only 50% max. Cheers from Baydo .

[@johnandersen3221]

Great video! You are the best, CN. Greetings from Norway.

[@Grasshoppa65]

Hi from Australia. Goddamit dude, your videos are awesome! The detail and description of what you are doing is beyond brilliant. You make transmissions look both simple and incredible at the same time.

[@louismaltese8329]

Cameron Niemela is the bee's knees. Awesome video. Keep them rolling.

[@benjaminmeeks3401]

Sweet video love them keep it going

[@PyroShim]

You make it look so simple!

[@medhead99]

That engine stand is an absolute unit.

[@jonathanpatchett7567]

Awesome vid as always. You make it look so easy. 🤙🤙

[@maxmustermann4047]

Hey nice video again. By the way through your videos you helpt me soo much by taking apart and putting back together my supermoto 125 thanks man your awesome. Greetings from Gremany

[@tomnekuda925]

Rebuilding an XR 200 a few years ago I followed the book and was determined to get a click-click out of the engine.....new crank/piston/etc and on break-in I still had the clicking.......ran the gap on the rockers several times and still had the click. The engine had never been apart before and buttoned up nice. To make a long story short...it had come from the factory lacking a thrust washer on the end of the rocker shaft. For 73 cents I got a new one from Honda and the click went away. Crazy things happen!

[@mxhonda2]

You were right about the main bearing seals needing to be slightly deeper than what would be level with the crank case. The manual specifies a certain depth

[@TheTedy1972]

Hi Cameron, great video. Just a few points. I would not be too worried about localised heating of case before fitting crank. Aluminium soaks up heat very quickly & dissipates throughout the case with no obvious warping issues. Also when the engine is started it warms up unevenly anyway without any warping issues. I have found that more often than not, that cranks are a tighter fit in the LH case than in the RH. So I usually pull the crank into the LH case first & assemble everything in the LH case, then the RH case usually just slides on. Some cranks are a tight fit in both bearings, so in that case it does not matter which side you assemble in, but I will heat up the entire opposite case so you have more time to slide it on before it cools. Heating up the inner race only as you have discovered does not work well. Don't worry about the heat damaging the seals as they can handle a bit of heat, as long as you do not direct a gas flame or heat gun directly at the seals.

[@colta51]

I Like your videos you work similar to myself but I could never make a video as clear as this well done

[@thatdesertmoto4923]

Bro I can’t wait it’s gonna be like show room condition!

[@zackmiller1165]

Well at least you caught it before it was completely put back together. Nicely done.

[@allaboutdiy1375]

I know what your going through first hand. My 2002 Xr650r was actually missing a few thrust washers and the dogs were pretty worn causing the bike to “automatically” shift from 2nd to 3rd gear under heavy throttle. Dangerous to say the least. It’s amazing how a few $3.00 washers can hold up a build. Or O-rings for that matter. Good luck bud

[@DirtBikeDaryl]

Great video!! It was very informative... I have confidence to dig into mine now...

[@dilsonscheuermann7089]

Nice and clean work!

[@Roadghost88]

Lol. I had a lot of trouble telling which washer went where when I did a similar rebuild on a CM250c. None of the manuals were clear on which washers went where, and if you swap any of them you will end up with problems. Everything is done to spec on those engines, so when you take them apart use calipers to measure washer thickness and record where it came from. That way if you mix them up or lose them you can easily get it sorted out. Nice rebuild setup you have there. Very clean.

[@martynjames5963]

I could spend hours watching ... wait a min ... I do spend hours watching this kinda stuff ... love it.

[@doneB830]

Excellent video well done