Im wondering if anyone here has done compression test on 400ex,440,450,465, and what ratio's pistons do you have. and what #'s did you recive
last night I did a comp test on my 450ex and got a 185psi reading
IM planning on doing modds to that motor over the winter and will retest it then to see if the #'s respond

hint's on testing
1. warm the motor
2. use a good tester (snap-on)
3. run quad with gas turned off till it quit's
4. test with kill switch in off pos.
5. crank motor with throttle in full throttle position .