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Hey guys. Long time lurker, first time poster. I recently bought a winter project. I found a 2007 Yamaha 25hp short shaft two stroke sold as a no start condition. Heres what i have done so far;
Fresh fuel
new plugs
cleaned the carbs and jets
compression is low in bottom cylinder but i致e read it could be the rings sticking because the motor sat unused for a few years. I filled #2 cylinder with penetrating oil and let sit 24ish hours. Compression came up to 120. I may or may not have gotten lucky on that one; doubt it.
The motor has intermittant spark. #1 always has spark #2 does not. I知 trying to not sink a ton of money into it just yet. I have a FSM coming also. Tonight I pulled every bullet connector off and cleaned corrosion and put back together. I pulled flywheel off made sure woodruff key is in place. The coils AND pulsar coils are quite rusty. I LIGHTLY sanded the rust off the coils to see if it gave the motor better spark. No luck. I知 leaning towards the pulsar coils are bad since the motor has no start, or want to start. After a ton of pulls I can get the motor to pop thru the prop. Thats it. I知 wondering if the coils can cause the issues i知 describing? I知 at my end of the rope here, not really wanting to take it somewhere just yet.
ANY help would be appreciated.
Thank you!
Fresh fuel
new plugs
cleaned the carbs and jets
compression is low in bottom cylinder but i致e read it could be the rings sticking because the motor sat unused for a few years. I filled #2 cylinder with penetrating oil and let sit 24ish hours. Compression came up to 120. I may or may not have gotten lucky on that one; doubt it.
The motor has intermittant spark. #1 always has spark #2 does not. I知 trying to not sink a ton of money into it just yet. I have a FSM coming also. Tonight I pulled every bullet connector off and cleaned corrosion and put back together. I pulled flywheel off made sure woodruff key is in place. The coils AND pulsar coils are quite rusty. I LIGHTLY sanded the rust off the coils to see if it gave the motor better spark. No luck. I知 leaning towards the pulsar coils are bad since the motor has no start, or want to start. After a ton of pulls I can get the motor to pop thru the prop. Thats it. I知 wondering if the coils can cause the issues i知 describing? I知 at my end of the rope here, not really wanting to take it somewhere just yet.
ANY help would be appreciated.
Thank you!
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