That front sprocket needs replaced too lol. Looking a little bent out of shape 😅. Good informative video as always. Dudes way underrated for the knowledge he has
@@troyhubbard50 thanks! Yes part 2 will come either by the end of this week or very early next week. Just depends on how soon the new cylinder arrives. He's hoping this week, wants to ride this weekend lol
@@UpAllNight91 Oh okay. I didn't know the cylinder was bad. But if he sucked dirt it's probably a good idea to replace it. I'm on the same bike and had mine honed when I did my top end. But I didn't suck dirt. The skirts on my piston were nowhere near as bad as his!
So I watched this .. orders a new top end ( big bore ) slapped it together tried to start would roll then stop couldn’t get timing at first didn’t know about the loose side and tight side couldn’t get the cap to set right took a breath and boom she running
@@UpAllNight91 ya I didn’t have the cap or baring on right and h couldn’t get the dang thing lined up right it was bad a scored my left lob a tiny bit is that ok ?
Bro you’re videos are the best. I’m debating on getting a used bike and your KTM 4 Stroke and this Honda one makes me feel confident I can rebuild more than 2 strokes! Great work!
This makes me appreciate 2 strokes even more lol. Every time i think i want a 250f i watch stuff like this and it makes me think otherwise lol. Not that i wouldnt be able to do the services, but more so how complex everything is compared to doing a top end/full engine rebuild on my smokers.
Modern Four strokes really aren't that bad. Keep your air filter clean and oiled and change your oil and filter and you can push a 450 200 hours no problem. 15-20 years ago they were way more involved and had much shorter service intervals.
Thank you for these valuable films! I trail ride a 2020 WR250F and it has 160 hrs on it. Intake valves are still in spec at 0.14 (0.12-0.19) and the exhaust side is good as well. Just had 3 questions: 1. Would it be wise to replace the piston at around the 250 hr mark? My only hesitation is if the bike runs flawlessly, why tamper? 2. Whenever the valves do go out-of-spec, just replace them? Don't bother to adjust? Since coating has probably worn off. 3. When the time comes, should I buy the genuine Yamaha complete top-end rebuild kit or piston assembly kit? THANK YOU AGAIN!
Hello. This bike is basically a YZ250f motor. I would suggest doing a piston soon. 160 hours is a lot on a 250f motor. I know its probably riden easy but at 160 hours the piston has had a lot of heat cycles which can fatigue the piston after a while. For the valves yamaha suggest if the valves been adjusted once and then need another adjustment to just replace them. I think the theory is if the valves breaks in to be a little out of spec, adjust back into spec. But if it wears and falls badly out of spec it needs to be reoplaced. Genuine yamaha parts are the best for this bike for sure.
Yes checking on the bench works. I just make sure the rocker arm or cam bucket are on the base circle of the cam load when sliding the feelers gauge in.
Hi Chris ! I would like your opinion on these titanium intake valves : Can we replace them by steel valves to save money or il's not a good idea ? Thanks Bro ! Love your content !
Hello. The titanium valves are very light weight so the valve springs used for them are of lower tension. This frees up power and reduces wear on the timing chain, camshaft and other valve related stuff. This is why almost all high performance high revving 4 stroke motorcycle engine theses days use titanium valves. The aftermarket stainless steal valves are surely heavier and require stronger higher tension valve springs. If using steal valves without also adding higher tension valves springs the valves will float (not close fast enough) and the valves can make contact with the piston and bend. So the higher tension springs are a must. I personally suggest OEM titanium valves because of the better performance and reduced engine wear related to the lower spring tension. The titanium springs will last for a very long time as long as good air filter maintenance is kept up. Its all about keeping the dirt and sand out.
I have the exact same model bike 2018 crf 450r and bought it used with 25 hours on. It now has 130 hours on it and I have yet to check valve clearance. Would you recommend going with OEM intake valves or do you think kibblewhite intake valves are good ?
Hello. I totally suggest OEM valves. The OEM valves are titanium and light weight. The kibblewhite are stainless and require stiffer valves springs. I would stick with the lighter weight OEM ones.
It surely can be normal. Especially with finger followers. The best thing to do is find someone with a bike like yours and give it a listen. Kinda get a idea whats normal for these bikes and what is not.
The intake valves are the ones that take the hit when dirt gets past the filter. The exhaust valves dont get eroded away at the seat from dirt like the intake valves do. That being said if the bike has 200 hours or more and I'm rebuilding it I then suggest replacing all valves, both intake and exhaust. Mainly for safety reasons as I have seen exhaust valves drop the head off out of no where when they are used for way to long, usually only happens after 200 hours.
They are not as reliable as the hondas of 10 years ago but they are built well. I believe they traded some general reliability for higher performance potential
yup a little costly. Especially when it could have been avoided. But some people don't know till they walk down that road. I dont even wanna talk about the not so good stuff I did in my early years lol. But its surely one of the reason I can work on them today. I broke them doing it wrong and had to fix it and learn to do it right.
![BOWKYLION - วิงวอน (ex-change) [Official MV]](http://i.ytimg.com/vi/cLdnZWDaO-w/mqdefault.jpg)
Great video👏🤟
Thanks!
Thanks very much for all the dirt bike fixing tutorials!~!!~!~~!~!~!~! :) :)
Thank you so much for your premium videos, please don't stop posting videos
Thank you! And thanks for watching! Appreciate ya
I’ve never had good luck with aftermarket gaskets as well
For sure. Just not worth it.
Being a 450 Honda owner can’t wait to watch this one
Part arrived so part 2 will be uploaded tomorrow
That front sprocket needs replaced too lol. Looking a little bent out of shape 😅. Good informative video as always. Dudes way underrated for the knowledge he has
Thanks man! The bike does need a few things. Chain slider and guide, you name it lol
The owner of this bike is lucky to have you! Air filter maintenance is key on four strokes. The rest of the bike looks to be in good shape.
Yeah shes not too bad. He honestly just didnt know. But he knows now lol
@@UpAllNight91 You have been killing it with your videos. Will there be a part 2 for this?
@@troyhubbard50 thanks! Yes part 2 will come either by the end of this week or very early next week. Just depends on how soon the new cylinder arrives. He's hoping this week, wants to ride this weekend lol
@@UpAllNight91 Oh okay. I didn't know the cylinder was bad. But if he sucked dirt it's probably a good idea to replace it. I'm on the same bike and had mine honed when I did my top end. But I didn't suck dirt. The skirts on my piston were nowhere near as bad as his!
@@troyhubbard50 yeah that piston skirt was way worn. The cylinder was actually worn past the nickle plating on the top part.
Thank you so much for posting this video. You are the man !
Thank you for sharing the knowledge! I have to do basically the same process on my crf 450 rx
Your welcome!
So I watched this .. orders a new top end ( big bore ) slapped it together tried to start would roll then stop couldn’t get timing at first didn’t know about the loose side and tight side couldn’t get the cap to set right took a breath and boom she running
Awesome! Good job digging back in a figuring it out
@@UpAllNight91 ya I didn’t have the cap or baring on right and h couldn’t get the dang thing lined up right it was bad a scored my left lob a tiny bit is that ok ?
Sorry. I didn't understand?
Bro you’re videos are the best. I’m debating on getting a used bike and your KTM 4 Stroke and this Honda one makes me feel confident I can rebuild more than 2 strokes! Great work!
Thanks man! Yeah its not too bad, just a few more parts are procedures.
This makes me appreciate 2 strokes even more lol. Every time i think i want a 250f i watch stuff like this and it makes me think otherwise lol. Not that i wouldnt be able to do the services, but more so how complex everything is compared to doing a top end/full engine rebuild on my smokers.
I agree. Surely more complex.
Modern Four strokes really aren't that bad. Keep your air filter clean and oiled and change your oil and filter and you can push a 450 200 hours no problem. 15-20 years ago they were way more involved and had much shorter service intervals.
@@troyhubbard50 thats true. It's really all about the maintenance. Its very important
Unbelievable he didn't oil his filter. Bet he will for now on!!! Lesson learned
Yup. Its strange but I do see this happen from time to time. People pull a dry new filter out of the bag and toss it on
Thank you for these valuable films! I trail ride a 2020 WR250F and it has 160 hrs on it. Intake valves are still in spec at 0.14 (0.12-0.19) and the exhaust side is good as well. Just had 3 questions:
1. Would it be wise to replace the piston at around the 250 hr mark? My only hesitation is if the bike runs flawlessly, why tamper?
2. Whenever the valves do go out-of-spec, just replace them? Don't bother to adjust? Since coating has probably worn off.
3. When the time comes, should I buy the genuine Yamaha complete top-end rebuild kit or piston assembly kit?
THANK YOU AGAIN!
Hello. This bike is basically a YZ250f motor. I would suggest doing a piston soon. 160 hours is a lot on a 250f motor. I know its probably riden easy but at 160 hours the piston has had a lot of heat cycles which can fatigue the piston after a while. For the valves yamaha suggest if the valves been adjusted once and then need another adjustment to just replace them. I think the theory is if the valves breaks in to be a little out of spec, adjust back into spec. But if it wears and falls badly out of spec it needs to be reoplaced. Genuine yamaha parts are the best for this bike for sure.
So checking valve clearance with the head off of the bike works? Does the cam need to be in any specific position?
Yes checking on the bench works. I just make sure the rocker arm or cam bucket are on the base circle of the cam load when sliding the feelers gauge in.
Hi Chris ! I would like your opinion on these titanium intake valves : Can we replace them by steel valves to save money or il's not a good idea ? Thanks Bro ! Love your content !
Hello. The titanium valves are very light weight so the valve springs used for them are of lower tension. This frees up power and reduces wear on the timing chain, camshaft and other valve related stuff. This is why almost all high performance high revving 4 stroke motorcycle engine theses days use titanium valves. The aftermarket stainless steal valves are surely heavier and require stronger higher tension valve springs. If using steal valves without also adding higher tension valves springs the valves will float (not close fast enough) and the valves can make contact with the piston and bend. So the higher tension springs are a must. I personally suggest OEM titanium valves because of the better performance and reduced engine wear related to the lower spring tension. The titanium springs will last for a very long time as long as good air filter maintenance is kept up. Its all about keeping the dirt and sand out.
@@UpAllNight91 What an answer! 😊 Thank you man, I got it. Very clear explanation.
@@juju-of2by Your welcome!
Keepers or retainers
Thats right! I was brain farting lol
How do you find top dead center on an electric start bike? Especially the 2023 crf450rx which has no right side crankcase access.
If there is no access on the right side, you will find one on the stator (left) side.
I have the exact same model bike 2018 crf 450r and bought it used with 25 hours on. It now has 130 hours on it and I have yet to check valve clearance. Would you recommend going with OEM intake valves or do you think kibblewhite intake valves are good ?
Hello. I totally suggest OEM valves. The OEM valves are titanium and light weight. The kibblewhite are stainless and require stiffer valves springs. I would stick with the lighter weight OEM ones.
Yo my honda crf 450 2017 has a pretty noisy top end ticking… valves are good is it just a normal thing for honda crf?
It surely can be normal. Especially with finger followers. The best thing to do is find someone with a bike like yours and give it a listen. Kinda get a idea whats normal for these bikes and what is not.
Is it me or do the cam journals look fairly scratched up? Perhaps the camera / light?
Hello. This motor has bearings that the cam rides on.
Any reason you didn't just replace the exhaust valves as well since your in that deep and taking it all apart? Other than them still being in spec.
The intake valves are the ones that take the hit when dirt gets past the filter. The exhaust valves dont get eroded away at the seat from dirt like the intake valves do. That being said if the bike has 200 hours or more and I'm rebuilding it I then suggest replacing all valves, both intake and exhaust. Mainly for safety reasons as I have seen exhaust valves drop the head off out of no where when they are used for way to long, usually only happens after 200 hours.
Would it be cheaper to replate the cylinder or get a new one?
Hello. Many times it is cheaper than a OEM new cylinder. But keep in mind it can take a few weeks turn around time on a replating.
Where did you mention about timing mate ?
Thats going to be in part 2 of this video. There is a link to part 2 in the description.
@@UpAllNight91 both good videos mate cheers. You should do a bottom end video same bike 😅
@@pikeman4203 LoL. I will as soon as one comes through that needs a full rebuild.
hello, are these new honda engines are reliable?
They are not as reliable as the hondas of 10 years ago but they are built well. I believe they traded some general reliability for higher performance potential
what is the clearance intake and exhaust?
Hello. Check the 43 minute mark on this video for the valve specs.
I broke the clip of the fuel line. where can i get minute 3:54
Link please
@@Pirañitahonda Unfortunately the only way to get that clip is to but the whole fuel line. What year is your CRf450?
ka ching, lol
yup a little costly. Especially when it could have been avoided. But some people don't know till they walk down that road. I dont even wanna talk about the not so good stuff I did in my early years lol. But its surely one of the reason I can work on them today. I broke them doing it wrong and had to fix it and learn to do it right.
do you have instagram?
No sorry. But you can email me at upallnight91@hotmail.com