I have a 92 banshee, FMF fatties, and a pro-design cool head. I don't know the dome size but when I purchased the cool head the domes were supposed to be the equivalent of the stock head.
I did a compression test today and my readings were 140 psi on both cylinders. i warmed the bike up and held the throttle open. i am at sea level.
My bike will start after about ten kicks when cold but when warm it starts right up.
I did this test because of the age of my bike and thinking I might need a rebuild of the top end.
Question 1: when doing the test, after kicking to the maximum pressure should the gauge hold its pressure or should it slowly leak down?
If it leaks down and it is not leaking from the gauge assembly is this an indication of a problem with the cylinder?
Question2: Seeking advice, with this compression reading should I consider the rebuild or leave well enough alone?