looking for some advice regarding the compression on my tohatsu 50.
It was at 140psi top, 135 middle, 140 bottom, then I took it apart to modify it.
I had 1mm removed off the head (which should raise it 30psi), but also opened up the exhaust port quite a bit.
Did a compression test yesterday and got 140, 135 and 140 again.
I'm going to do a squish test today.
My question is (if the squish test shows its OK) is it safe to remove more from the head to remove compression?
I know it's safe to run 180psi on a stock engine here with our fuel.