RM250 90 RM 250 Starting issue

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drew76924

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drew76924

thats what the top of the piston looks like but it still pulls 200psi compression i put my finger inthe cylinder and the walls feel smooth and if its keeping compression i don't see why this would be the cause... although i have no idea what would cause that to happen...

also theres alot of fuel/oil mix coming out of the cylinder... you can see it on the pipe i don't know if that becuase it keeps flooding becuase it wont start or if that might be part of the problem.
 
Mihylo33

Mihylo33

those are chips on the top of your piston and scores on the side......

sounds like this thing really needs to be gone through with everything cleaned and set to spec
 
bobkyle2

bobkyle2

Another big issue i had....

My carb vent holes were stopped up... And the float seat was shot... It wasn't leaking gas outside the carb.. So i thought the float seat was good... But i pulled the carb off and set it up right.. and held the fuel tank above the carb with the fuel line connected and turned the fuel on.... And the fuel was draining into the engine... You might try that.
 
bobkyle2

bobkyle2

Detonation .... Running lean....

Jetting...Crank seals..Im pretty sure any kind of air leak can cause that. (someone back me up?)
 
bobkyle2

bobkyle2

This is what FMF calls for... It wont be exact because every bike/climate is different, but should get you in the ball park.

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This is what pro-circuit calls for with there pipe.

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I think you already went over this with 2smoke earlier in the thread ... I just remember'd as im typing this... But figured i would leave this with you :D.
 
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