I borrowed a pressure tester from the local auto parts store and tried testing the compression on this Yamaha 8hp snowblower engine.
I opened the choke and set the throttle to full open. But I'm confused.
When I tested by pulling the recoil starter just through one cylinder of compression I got one reading ( 47 psi ):
Then when I pulled the recoil starter cord fully (like you would to start the engine) I got another reading (72 psi ):
Then when I plugged in the electric strarter and really spun the engine over I got a third reading ( 100 psi ):
I repeated each of these tests several times and always got the same results (pretty much). Could I be doing something wrong? So which one am I supposed to be looking at?
This message was modified Feb 17, 2009 by Underdog
