Testing compression question

[sledgreg]

Alright, sorry if this has been asked a million times. I know I read a thread on here somewhere regarding testing/checking compression but I cannot find it.

Correct me if I am wrong.

should I remove both plugs, give approx 6 pulls on each?

Should I have the throttle wide open? or should I do one set of tests with no throttle and another set of tests with throttle?

also should motor be warm?

And one last question ( i can never find a true answer other then both cylinders need to be very close)

What should the compression be..... whats too low

My test subjects are a 2011 assualt
and an 09 800 dragon

thank you

 

[winter brew]

Plugs out, key off, cold or warm doesnt matter much. 5-6 pulls or until gauge stops going up....varies with gauge.
Comp varies with altitude and any porting or head changes...should be even both sides.

 

[sledgreg]

Well just did the test

125psi on both cylinders on the assualt and 121psi on both cylinders on the dragon

thanks for the help.