Just wondering how much compression my yz450f should have. Its a 2010 with 30 original hours, never rebuilt or had the valves adjusted. Seems to have low power compared to other 450's I've ridden and I'm thinking it either needs a rebuild or valve adjustment. Still starts fine and doesn't make any noises but is leaking oil out of the crank vent hose. I'm going to do a compression test but don't know what kind of numbers I should be seeing. Any knowledge would help, thanks.