Depends on why there is no compression.
Bad cylinder head gasket or valves.
Most of the times when you have low compression on one cylinder it's an indication that the head gasket is blown. If more than one cylinder has low compression and is hard to start the you most deffinatly have a blown head gasket
Remove number one spark plug and squirt some motor oil into the cylinder. Now do another compression test. If the compression goes up considerably in number one cylinder you probably have bad/worn or cracked piston rings. If the compression doesn't change much you probably have burned or bent valves.
Blown head gasket. Take to dealer immediately.
Oil burning or loss of compression on any one cylinder. It may also be missing on one cylinder. A compression test will verify this.
Not running on all cylinders? Check spark plugs and wires Do a compression test to see if one cylinder is dead
Burnt Valve, worn piston rings, blown head gasket, or cracked head.
How do you fix no compression in one cylinder? Yes, a dead cylinder can be fixed by checking and rectifying any defective component that falls among some of the reasons that result in a dead cylinder; in order to fix a dead cylinder, you will have to diagnose the cylinder by using a compression gauge to test whether there are any cylinders with no compression. Usually, a leaking gasket.
The cylinder compression, for your Polaris ATV, is 14 to 1. The cylinder compression usually decreases as the vehicle gets older.
What is the cylinder compression on a 1991 Ford Ranger with a 2.9?
I'm not sure of the exact values; they should be in your Haynes repair manual. However, if you compression test all of the cylinders and find one that is lower you have a compression problem with that cylinder. It is also possible to have 2 that are lower, this would most likely indicate a warp in the head between those two cylinders. Other causes for compression loss are damaged or gunked up valves that do not close all the way or a crack in the head.