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in my 1986 yamaha srv540, i jus rebuilt the motor, and was wonderin what the correct PSI should be in both cylinders. any help is great
THANKS
 

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i have an 84 srv540 and i just got wiesco pistons 30 over and a fresh bore late last year.. i've been going over my sled this year and i only have 90 psi cold so i ran it till it was hot and i still only had 95...i even added a little injection oil to seal the rings a little... any ideas??? there both dead even at just above 90 psi
 

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Just did my 600 and its pumping 140PSI a jug.

As for your 90PSI fresh build i would pull the head and check your piston clearance, sounds like you either got mislabeled pistons/rings or the jug was bored out of spec.
 

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well i'm gonna throw another set of rings in it there cheap.. the cyclinders still have the cross hatching.... should i file them??? i filled the last ones and was wondering if maybe i filed to much??? there wiesco pistions...
 

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has anyone shaved a little offa the top of the head before and can it be done????
 

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Shaving the head raises compression, making it more finicky to fuels, air temp, etc. I'd leave it alone for the minimal benefits it gives you.
 

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Try doing the compression check again with the throttle held open, and yeah... skip filing the rings. generally no need with weiscos unless your making something crazy.

jayman54 said:
i have an 84 srv540 and i just got wiesco pistons 30 over and a fresh bore late last year.. i've been going over my sled this year and i only have 90 psi cold so i ran it till it was hot and i still only had 95...i even added a little injection oil to seal the rings a little... any ideas??? there both dead even at just above 90 psi
 
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