Anybody know anything about these 500's? Last night I changed the oil and once again it had nasty oil and both plug magnets were full. I knew it wouldnt last long but I drive **** til it dies. Anyway, got the oil changed and drove it around last night. Noticed the idle was high as hell. I tuned it down and that was it. Got to Badlands today, ****** fired once and never again. Changed plug, checked fuel. Took off valve cover to find the exhaust cam sprocket half an inch off the cam and grinding against the case. We knocked it back on but I believe its out of time.

I believe this is an interference motor, but can anybody shed any light?

thanks!