For the most part they work just fine. I have found a few on the Huasheng 49cc that had bubbles injected in the lobes and caused premature wear. The cams didn't fail as I caught the problem in time which was thousands of miles of hard riding the bike since I built it.Some of these 4 strokes are using a polymer or plastic camshaft...
Are they holding up?
Seems like a weak point to me, but maybe I am wrong??
Anyone have any issues yet?
I got to this post because I was searching for info and reviews on the Stihl 4 mix engines for use in motorized bicycles. Where did you find a performance cam for it?My 24'' Schwinn with the Stihl backpack leaf blower motor has a plastic cam and before I got the motor it served every work day for 5 years at 5400 rpms with no failures. I only replaced it because there is a higher power cam available and it does more than 8000 rpms now. It also has a centrifugally de-activated compression release built into it like a lot of the metal cams.