I have a 99 sportsman 500 that is very hard to turn over, if I take the spark plug out turns over very easy and there is no noises coming from the engine. I put the plug back in and it is very hard to get to turn over. I've gottin it started one time, since then its just difficult to get it to turn over. Seems like there is to much compression. If anyone can help me with this issue I would be forever greatfull.