Can anyone tell me what the engine compression should be for a 1999 Sportsman 500?

 

guessing at least 100 psi

 

Why do you ask?

What sort of problems are you having?

 

Original problem was no spark. Ohm meter indicated the stator was the problem. Trying to pull the flywheel per the repair manual, had the puller on and when i turned the large center bolt on the puller the engine would rotate, after about 1/2 trun in got hard to turn and when I beared down on it something popped, I thought it was the flywheel breaking loose...but it wasn't... after that it seemed somewhat easier to rotate the engine. I put a comperssion gauge on it an only reads approximately 25psi???? Pulled the vavle/rocker cover off the rocker arms are both moving the springs look OK, the cam chain is OK. I do not know how much compression it had before, but it was running fine up until it stop firing the plug. The recoil starter/flywheel/stator area was full of water.

 

The sportsman 500 motor has an auto-decomp so putting it on a compression gauge it will only read 20-35psi.

 

Thanks, I am very happy to hear that. So how do I check the true compression? Another question, how do I lock the flywheel to keep it from turning so i can pull it off?