Check piston on 86 Yamaha moto4
#1
Check piston on 86 Yamaha moto4
Just got an 86 Yamaha 225 Moto4 for $100. Seller said it ran when they last used it 10 years ago. I put a new battery in it and the lights work and neutral light works. It seems to shift fine. However I think the piston is seized up from rust.
What is my best option? I put some oil in the spark plug hole to let it soak a little while ago. Can I remove the top end without taking the entire engine out?
What is my best option? I put some oil in the spark plug hole to let it soak a little while ago. Can I remove the top end without taking the entire engine out?
#3
You can almost always get the head and cylinder off with the engine in the frame but you won't get the cylinder off if it is stuck to the piston. I would try taking the pull start off and rocking the crank gently backwards and forwards with a bar. Diesel fuel or easing oil down the plug hole is recommended by mechanics. Leaving for a couple of days to soak before freeing off is a good idea. If it is still stuck, take the head off and knock the piston down the bore with a block of wood as a drift.
#4
#6
I have the same quad.
Regarding its former carb problems: https://atvconnection.com/forums/yam...00-carb-2.html
Regarding its former carb problems: https://atvconnection.com/forums/yam...00-carb-2.html
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