How to Redo your Top End: Yamaha Moto 4 Valve Install on low compression YFM225 ATV - Part 5
ฝัง
- เผยแพร่เมื่อ 2 พ.ย. 2024
- / wrekkedoffroad / @vermontlife www.buyjimmyab...
Did you know... 83% of the channel viewers aren't subscribed. If the content helps you save on repair shop costs, and you think the quality is good, help me build the channel by subscribing and/or buying me a beer, or 2 or 3... I appreciate it.
Buy Jimmy a Beer!
www.BuyJimmyAB...
Support the fun by liking and subscribing bit.ly/2kPku2P
After my tear down inspection in an earlier video I decided to replace the valves. Time to lap and install them. A bit of a pain on a one piece cylinder head but I'm learning some techniques to help.
This is a slower video that shows more hands on success and failure. If you're looking to watch someone who isn't an engine pro work through the challenges of doing valves on a 1988 Yamaha YFM225 this is a good, realistic how to video. This video also applies to the YFM200DX 1986 at least.
Lapping Compound - amzn.to/3cd5kNt
Lapping Tool - amzn.to/3qLu2bH
Valve kit - amzn.to/3p85J7c (This is a kit. I was only able to find just the valve stems I used in the video on Ebay.)
Support the fun by liking and subscribing bit.ly/2kPku2P
Enjoy our Vermont Life merchandise at bit.ly/3cUEZ4d
My Film Equipment:
Go Pro Hero 7 amzn.to/2wPIzwp
The Bendy Tripod Thingy... - amzn.to/2HXnm5T
Cheap Spare Go Pro Batteries - amzn.to/2vitym5
Go Pro Accessories - amzn.to/3caFve8
Go Pro Hero 7 Light - amzn.to/36vXp9f
Go Pro Ball head arm Clamp - amzn.to/2K5HNlr
Samsun EVO 256 MicroSD - amzn.to/38BVAdL
Edited on:
Filmora X
Windows 10 64bit, NVidia GTX 1660, solid state drive for proxy files, 7200rpm for raw video, 16gb ram, AMD FX 8350 8 core CPU 4ghz (Great for 1080 but not enough power for full 4k editing without first down-converting raw files before edit and re-upconvert)
Please Note: These are affiliate links. I do receive a commission if you choose to purchase from one of these links. I want to say thank you in advance for any of you who do. The support is appreciated.
#BarnFind
#Yamaha
#Project
Just for FYI. Exhaust valves take a lot more abuse due to the hot exhaust air passing across it whiles it’s not seated. The intake valve doesn’t get hot air running across it and it is seated which heat sinks heat away from the valve thus lowering it’s temperature. Intake valves also benefit from cool intake air and fuel mixture flowing across it when it’s open. If you seem to have repeated issues with exhaust valves check your fuel air mixture. The more lean the mixture the hotter the exhaust gas temps, the more abuse the exhaust valve takes. Excessive lean is another set of issues. Thanks for the video and good luck!
Exactly, I'm in the middle of doing one of these at the moment. I never removed the rockers at all, I just took the cam out. So much easier.
Just a thought for next time. If you place the rocker arm shafts and the cam in the freezer overnight and then heat the head in an oven or with a torch just prior to installation, the shafts and cam should slip right in with minimum effort due to the difference in temps of the metals. (The aluminum head heats up and expands nicely). These jobs can be a little frustrating as you obviously experienced.
nice job on the lapping, use the drill for the first 90% finish with the dowel lapper
Use a little bit of grease to keep the keepers in place. Not oil.
I figured that out over the years. Man I struggled with these until I figured that out.
Use grease to hold keepers
Now that is an awesome idea that I will definitely be using!
What is the difference between the yfm200 motor and the 225 other than displacement? Will the 225 top end fit on my 200?
To my understanding, yes. (I haven't tried) I expect to have to do one of my yfm200's next year. From my research so far my understanding is that I can put the 225 cylinder/piston on my yfm200 and reuse the existing head. I'm not sure if this will affect my jetting at all but, while I can't say 100% I do believe they are interchangeable and the 225 kits are a lot easier to find.
Did you change the valve guides ?
Ooh, I can’t recall if I did on this one but I don’t think so. If I replace the timing chain I usually do as the guides usually come with the chain.
Not the timing chain guides , the valve stem guides
Sorry, had timing chain on the brain. I didn’t replace the valve guides. Matter of fact, the kit didn’t come with them. I’ll have to watch for that on the next moto4 head. Do they just ‘pull out’ on these quads and you press new ones in?
Ya did you install the valve seals in?
@VermontLife yeah just pull them out qith a pair of pliers
Does anyone know if the 225 cylinder rebuild kit would work on my yfm 200?? Just bolt on kind of deal like normal installation?
It doesn't..
Tell me more. I was considering giving it a try on one of my yfm200’s. It looked like it would but I haven’t found any definitive information. You could save me some misfortune.
@@VermontLife The gaskets are different 1 is 67mm the other is 70mm so not sure if it will work
Not sure if you know web cams can grind your cam shaft to get a little more power
Great videos though very thorough and helpful!!
I wanted so to reach in and stop you ! Wait ! You didn't install the valve spring and keeper !
:). I’m sure I didn’t get far without those. I’ll have to go back and look in the video. I’m sure they are there but I may have skipped it in filming unfortunately.