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i believe it is a yamaha it might help if not too far gone if that's what it is. you could need a drive belt too. there is an adjustment for the clutch on the throttle side of the bike on the motor/trans. it looks like a nut with a slotted screw thru the middle, not sure if its left or right to put more tension on it ... here is the service manual link .... https://www.yousendit.com/download/QlVnNHB5VnMxUUJOeDhUQw
It has a spring loaded decomp level that holds the exhaust valve open slighly for 1 revolution only. You flip up the lever & you get 1 pull on the crank. If it doesn't start , You repeat the process. If no compression, The lever is stuck OR you have a Top End problem, like bent valves or worn out rings or hole in the piston.
Remove:
- Left Side Cover
- Clutch Adjusting Cover
Loosen the locknut
Turn the adjusting screw in until it is lightly seated - Be careful, the screw will keep turning with enough pressure. Just turn it in lightly until it stops
Turn the adjusting screw out 1/4 of a turn
Hold the adjusting screw in place, tighten locknut
Replace covers
Check the clutch cable free play and adjust (at the bar end) as necessary.
Adjusting the Clutch Cable - Upper End
Follow the procedure outlined in the Yamaha Owners Manual
How long was the moto4 sitting? and did you pay close attention to the low speed jet that it is not blocked, the most common problem is the carb if the unit has been sitting for long period of time and the small jet will be blocked so you need to make sure its clear.
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