Just did cam upgrade on our family's kids 107cc bike.
I had previously modded cam sprocket bolt holes to oval shape to get advance/retard adjustability. I had tweaked stock cam back and forth for good bottom end grunt (it's easier to learn to ride a bike that is reluctant to bog and shut down...
Our family's 107cc Chinese p.o.s. has had flywheel to come off three times now. It has hammered the keyway out of shape.
I took Dremel tool to make keyway come all the way toward securing nut threads. I made a new key outta flat bar metal. File it proper size, used torch to make it hot, dipped...
More on camshafts. In search of tuning cam specs, the Google took me to a Philippino minibike site.
Pls. see Thailand sourced tuning cam data:
Affordable Racing cams for Honda bikes
Quote:
"specs: Stage 2 of NANO racing products, 280deg - 9mm lobe lift and 102 lobe angle separation."
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