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
run a compression test on it should read about 150 i think bad head gasket or crack in head.
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.
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
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.
I have a 1995 400cc Polaris scrambler and I count 15.
spark plug gap for polaris 425
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.
what do you need to know about
under the hood you should have the brake master cylinder which is larger and a smaller reservoir and this should be for the clutch.
Take off the front rack and front slope cover , should be under cover .
If all the timing marks are lined up it should be TDC compression.
The compression ratio for the 1995 Mustang is: 9.0:1
Besides water in the oil, you will have little to no compression on the cylinder(s) in the area where the gasket is blown.
It should be the 2.2 L and the 8th digit of the vin should be "4".
The 1995 Polaris 400 vehicle identification number is located on the vehicle identification number plate attached to the frame. You will find the flight below the seat.
4 Cylinder should be 1-3-2-4
The engine needs fuel, compression and spark to run, you are missing one of those.
A 1995 Nissan 6 cylinder pickup should have a spark plug gap of .044 inches. These spark plugs come preset from the factory.
On a 1995 Ford Ranger : I'm assuming you mean the 2.3 liter four cylinder engine with Fords twin plug ignition system ( The spark plugs for the compression / power stroke are located on the drivers side of the engine , intake side )
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