I purchased a 1986 TRX 70. My first quad project. The engine came in pieces in a bucket. It's been a challenge finding out what I have and don't have as I go along. I decided to use an 88cc cylinder (new) I had for another project and a new head. I thought the new head was the upgraded racing head, but not so sure now. Attached are pics of the cam and cam gear. The gear center hole is clearly too small to install on the cam. I have a few used cams from my atc70 projects around and they don't fit either. Can anyone explain what I am dealing with here? Is this a stock cam or an upgraded cam needing a different cam gear?
Thanks