SX/SXi/SXi Pro Compression Test, motors been sitting, LOW PSI?

[98SXIPRO]

well , i finally got a chance to get the electronics back in tonight. before i even put gas in the ski, i hooked up a compression gauge to my ski cause i just put a new ADA girdle head with 26cc domes. (so it should be around 180psi). i rebuilt the top end on my ski at the end of last year, only one ride on the new topend (break-in) last year with the stock head i was getting about 150psi. the ski has been sitting now for months in the garage all apart cause i did a X2 C.A.T.S to it. when i cranked it today the i was only getting 135 PSI on both cylinders. is the reading low because there is no gas in the cylinders? the oil is all in the bottom of the motor and not up by the rings? i put some gas in the tank and started it for just a split second and retest the compression and got about 145 on both. has this ever happened to anyone? did i possible pinch an o-ring on the head(on both domes??) the o-rings are/were brand new.

 

[509freerider]

I would get it to operating tempature and re check it. Also with only one ride I would say your motor is not fully broken in. If you can make sure your compression tester is working correct, I don't trust mine 100%

 

[Aircraftsalz]

I would run the ski & recheck. Plus the gauge could be bad or reading low, I always check with two gauges (Snap on, then my Mac gauge) if I have questions about a low or high reading.

 

[Big Kahuna]

yup, get it running first.

 

[98SXIPRO]

thanks everyone for the input. ill take everyones advice, and getting it running, and check it again later.