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Valve lash settings 85 moto4 200

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Old 01-19-2018, 09:00 PM
yamahapaul's Avatar
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Default Valve lash settings 85 moto4 200

I can only find info on this for the 225 86-89, any specs?


I have found my no start issue is linked to valves, it's spitting out the carb when I try to fire it off. 45lb of compression. I may get lucky and just have to adjust it, I'm guessing it's a bent one though.

more adventures in this piece of junk....

Thank you.
 
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Old 01-20-2018, 03:25 AM
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If it is adjustment, there will be no clearance at all on one valve when you check. Don't know what it should be, but 0.003" on both will restore compression, if it is just adjustment.
 
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Old 01-22-2018, 12:02 PM
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I don't think you would have any compression if your valve is bent. If its firing out the carb you might have a vacuum leak check your orings and or boot I cant remember how the carb connects on them. Will not hurt to check lashing though that's for sure.


Are you checking compression at wide open throttle?
Allot of times a bent valve will take out the piston also. I have 2 moto 200's and I had the same issue on mine turns out I had very inconsistent spark and ended up being the cdi box It had spark but wasn't at the right time and sometimes weak. It had a Mr Electric brand CDI on it I got another the same brand and that one didn't work neither If its sparking like I stated get a used OEM one off Ebay
 
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