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- Опубликовано: 26 июл 2023
- Top end job on a 2018 CRF450R (Part 2). Pretty much the same steps for the 2017 to 2023. New piston, intake valves, and timing chain.
Link to part 1 of this job - • 1:11 CRF450R Top End R...
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Thanks for watching!
upallnight91@hotmail.com 
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Rebuilt my CRF 450rx snowbike using your video! Athena big bore kit and hotcams stage 2 cam. Did the heat cycles and took it easy for the first hour of riding but didn't notice a difference in power for about another half hour and then it must have broken in because it screams now! Thanks for the vid's couldn't have done it so easy without your help! Thank You!
Ahh, thats nice to hear! Glad to hear it was oh help!
fantastic videos, thank you very much and I changed my gearbox on my 17 crf 450 thanks to your videos, I don't speak English and I used an extension to translate you into Spanish, thank you
Ahh thats awesome! Glad to hear it helped you out!
Im about to do this on my 2019. Thanks so much!
Your welcome 🤙
Awesome vid!
Thanks!
Rebuilding my 230. This video has helped tremendously
Thats awesome!
Fantastic, have learnt alot watching... thank u good sir
Ahh thanks man! And thanks for watching!
I'm back, great video since my son has a 22 CRF450RX. basically the same thing. Thanks my friend
Yes sir! Thanks for watching!
This is perfect
Thank You sir for the movie. You are a wise man indeed. A lot of knowledge, great content. I am the owner of RX 450 2018 but looking at Yamaha more often. By the repairs of the motorcycles, which bike is the most well engineered in Your opinion?
Thanks! Hmm, well the most reliable in the recent years seems to be the Yamaha's. Kawasaki's have come a long way and are pretty dang reliable as well. Honda's are built well and are great bikes but they do have issues with the electric starting from time to time. KTM's seem to have wire issues from time to time but otherwise are built well. But overall it seems Yamaha is surely the most reliable across the whole bike
No way... first!!! I'll comment after video
Great video. Thanks for the effort of putting it together. Did you go to school to be a motorcycle mechanic or are you self taught? Just wondering if my knowledge could ever catch up without schooling.
Hello. I never went to school for any mechanical work. All self taught. I was already digging into this stuff before I had access to the internet, but the internet surely supercharged the ability to learn on our own. I use to have to walk into the shop of my local motorcycle shop and hang out with the guys to peal info from them but the net has made it easy. I had a good friend of was a auto mechanic and he would always say "experience is what really matters, you will be paid based on your experience and not on your schooling". If you want to learn its all about getting your hands dirty and doing as much research as you can. If you enjoy it, it will come easy.
My previous question has just been answered 26:55 thank you
My new question, hopefully not a dumb question.. but what size valve shim do you put in for brand new valves on a 2005 Crf250r? Is it a factor of seat depth and valve stem protrusion height? I am doing a full top end and I’m just a little confused. Thanks for the education
Hello. I don't know what shim height that comes with when new, and even then no two bikes of same make and model will be the same but will be very close. Its always best to start with the shims that already in it, check it and adjust from there. I have a video where I do it on a YZ250f that will give you a good idea. Slide the video to the 40 minute mark to get right to the valve adjustment part. Here is the link to the video ruclips.net/video/iOV2hVJhI0E/видео.htmlsi=T8I2sdskiOK3yfE2
BOSS you should recheck those TDC lines on your cam gear it looked off sorry
Hello. It was dead on, the camera did kinda make it look off. But I even double check with the camera off. Its good and bikes had a day on the track.
I just got a 2019 crf450r which I’m going to build for supermoto , I done a oil change and the oil filter and there was a lot of particles in the oil , it seemed it didint get changed often by the previous owner , there was some magnetic particles and rest was not magnetic I’m thinking it’s from clutch and the oil filter was almost perfect clean just one small price of metal I found no dust , should I be worried and would u recommend running a bit more oil than the recommended 1L maybe running 1.2l as it seems extremely low for such a large cc and powerful machine, this is my first 4 stroke and I’ve been watching for a few months and this is my fav motorcycle maintenance channel love watching all the videos, thanks
Hello. Congrats on the new CRF450r. They dont use much oil, this is correct. These are race motors and they expect the oil to be changed very often. Depending on how fast the rider is, about every 1.5 to 3 hours per oil change. I would run the correct amount of oil and just change it often. The metal in the oil is most likely transmission trash and that can be totally normal. The important thing to watch out for is brass or copper color shavings in the oil filter, if you see that then its a crankshafts lower rod bearing coming apart. I would run a magnetic oil drain plug to catch the transmission trash and keep track. A little dust type shavings is normal but if you start finding bigger than dust size then you may want to open her up and poke around a little.
@@UpAllNight91 thanks, I got a magnetic drain plug for it and the debris of metal in the oil were 1mm wide dark magnetic peices of metal maybe 7-8 peices and other non magnetic junk , I think I’m gonna do a quick ride and drain it again to see if there’s more junk in the oil and just leave the project until I open her up and slowly replace what looks worn better be safe than sorry,
Lastly about the copper and brass after taking another closer look at the oil there is tiny dust sized specs of brass floating about but not many so I think I bought a lemon so a rebuild is necessary, also there was piece of metal with heat discolouration looks like bearing material, so any other advice would be welcome thank you again
@@justcrapclips4214 Hello. Yeah with that much floating around its probably best to open her up and peek around. I would at least pull the cylinder and check the cranks lower rod bearing and put a new piston in there while your in there. The metal could be transmission trash or a starter clutch coming apart. But the copper color stuff is almost always a lower rod bearing starting to come apart, unfortunately.
What's your thoughts on using a small amount of anti seize on the dowels?
I have never tried it but it wouldnt hurt to try.
Have you noticed oem yz shock springs are 260mm in length but aftermarket springs are 270mm would this matter 🤙🏻
I have noticed some springs are longer and shorter. Heck I have two 4.9 OEM springs from the YZ250 and one is slightly shorter than the other. It shouldnt make much of a difference though since we have the ability to adjust the shock spring on the shock.
Are Honda 450s engines just naturally noisy? I have a 2017 and mine sounds like this one but I’m always worried that something sounds like it’s knocking lol
They can be, most modern 4 stroke MX bikes are kinda noisy. Its important to know what your bike sounds like when its healthy and in good shape that way you know when something doesnt sounds right. Because they can be naturally clunky sounding motors. If this is a used bike and you havent been in the motor yet I suggest doing a top end. This will allow you to inspect the crank and everything and you will know if shes good to go or if shes about due for more work. I dont even ride a used bike untill I do a top end just to be sure.
do you not check valve clearance when you put a new piston in and cylinder in?
Yes. In part 1 of this job. Here is a link to the part 1 video. ruclips.net/video/FWt7Ws40Fl4/видео.htmlsi=yn4d8uTU5QxBPhpi
So I’m gonna give it ago, doing my 2002 crf450 top end rebuild, my question is, the way you done your shims, can it be done on the 2002 model?
Its pretty much the same except the 02 crf450 uses only one cam and for the exhuast valves there will be a rocker arm instead of buckets.
Thanks mate wish me luck lol,first time doing something like this, gonna give it ago if it fails then will take it to someone, just trying to learn how to do it myself to save money 🤦🏼♂️
@@nathankemp1263 For sure, and thats how you learn. I have faith in ya!
Have you ever used any WOSSNER parts?
I have never used one myself but I have installed them for other people. They look like a quality piston. Very similar to wiseco
what top end rebuild you prefer yama450 vs honda450?
Hmm. I would say the yamaha is easier because I don't need to fool with the sub frame to pull the intake off the head but otherwise they are about the same.
"It's going to smoke for a while. Its a fresh rebuild with lots of lube. It will go away after a short while." Problem solved.
Yes they will. Sometimes for way too long and if your doing this for a customer they might not understand. However I can honestly say putting them in bone dry doesn't hurt a thing. I have pistons taken out of my 450 that where put in bone dry and they look better than most. Dry or lubed, its really doesn't matter. I see videos where guys are lubing the piston with assembly lube and its all drenched, clumped up and dripping off and its like dang dude lol. Makes it hard to hold the piston and make sure the rings are positioned correctly. And again it doesn't help anything so why even do it. A dry piston makes for a cleaner job with no smoke.
guess theres no wrist pin bearing???
Yup. No bearing on a 4 stroke like this. Just wrist pin and rod.
*promo sm* 🏃
Thanks!
Hey boss you do good work but where did you get your information on assembly lube. I've been rebuilding my own bikes and others for 35 years. I have NEVER heard that assembly lube will contaminate your oil. Assembly lube is an oil just a little thicker. There is nothing in it that contaminates oil whatsoever or people shouldn't use it. And your surclip theory is yours but you put it in wrong. Never heard of a piston splitting in half theory either. I've worked on Hundreds several hundred bikes of all types and never heard of that.
Thanks. Dont know what to tell ya. I can only say what I have witnessed as well.
@@UpAllNight91 I get what your saying but if assembly lube was contaminating what so ever they would never use it. If someone uses an exuber amount I could agree with you but the amount someone that knows what they are doing will never contaminate the motor oil. I've known hundreds of mechanics over the years and never heard it contaminates oil. If you use a whole 12 ounce bottle I can agree but if you use it like it's recommended it will never happen. It's a an assembly lube. But if you seen contaminated oil from assembly lube they whoever used it is a complete idiot. And I would challenge anyone who uses it properly as recommended to show me contaminated oil. If you use too much of anything you will contaminate anything. But use it properly and or as recommended on bottle it won't happen. One bottle of assembly lube should last a about 20 motors. You don't have to drown parts with it just a light coat is all you need. Some parts need a drop some parts need need two. I'm not saying your wrong but if you seen contaminated engine oil from assembly lube I can see why that person would bring their bike to you to get it fixed a second time. Not knowing what their doing. Backyard mechanics are the worse either they can't read the directions or just don't want to follow the directions thinking they know everything. I have seen some stupid shit people have done to their bikes I have enough stories it would take days to tell you. Tell you one but not the story it's too long dad buys son a bike new off showroom floor. They didn't get premix oil for their gas so what does dad do I asked him how it happened his excuse oil is oil it's all the same. He put high temp corn oil in the gas. Not a joke. So I told him how much it would be to fix he looked at me like I was trying to rob him. I told him 8 bucks for a bottle of premix would of saved him 2,700 for all the parts needed to fix it. Not including 1,700 for my time and labor. He wasn't happy at all.
@@cheto2952 I dont have anything against using it. But since in most cases I will be starting the motor after the job using motor is good. If I was to use assembly lube I would want to do a oil change after break in to remove any of it mixed in. But assembly lube does cling on well and is surely good if the motor will be stored for a while. LoL, yeah I told a guy one time if you forget premix even one time the motor will burn up. He responded with "even just one time!" lol