I have a cam button in place it came with the drive also when I bought the drive I was told it works with the stock cover. It is the idler gears that I am conserned with. The motor doesn't see much over 5000rpms. I followed the instructions carefully when I installed them. If I have to replace a cover every 10,000 miles I won't be too conserned, but it just seems alittle unusuall to me. I have never used gear drive before so it is a new experience to me. Maybe next time I'll just put a super charger on.