i believe anything over 115psi should be fine. 115psi is the service minimum, as in if it drops below that the engine needs a rebuild
The compression on a 1995 Polaris Indy 500 snowmobile typically ranges between 120 to 130 psi. It's essential to ensure that the compression is within this range for optimal engine performance and reliability. If the compression is significantly lower, it could indicate issues such as worn rings, a blown head gasket, or valve problems. Regular maintenance and checks can help maintain proper compression levels.
The compression on a 1995 Mercury 60hp outboard motor typically ranges from 90 to 120 psi across all cylinders. It's essential for each cylinder to have similar readings for optimal performance. If compression is significantly lower in one cylinder, it may indicate issues such as worn rings, a blown head gasket, or valve problems. Regular compression checks can help maintain engine health.
run a compression test on it should read about 150 i think bad head gasket or crack in head.
Bad spark plug or wire? Bad Valve or piston? (do a compression test)
Set your #1 cylinder to TDC on the compression stroke.
in the right conditons you should get around 105mph
Idon't know about a 1995 Polaris 300 Sportsman, but I have a 2008 Polaris 300 Sportsman and the main particular oil I use for mine is Polaris brand oil. If your not satisfied with my answer, call your Polaris Company.
1st check the compression on the rear cylinder to the compression on the front cylinder they should be about the same. 2nd With a spark indicator and the motor running check to make sure you have steady spark if not bad coil. 3rd if both of the above check out ok. replace your intake gasekts the one on the rear is leaking. I assumed that you have already change out your plugs and plug wires.
A compression test would be the easiest way to determine. If you have little or no compression in two or more adjacent cylinders, you either have a cracked cylinder head or a blown head gasket.
I have a 1995 400cc Polaris scrambler and I count 15.
spark plug gap for polaris 425
Take off the front rack and front slope cover , should be under cover .