OS FS cam questions
If you make the mark straight down on the cam, you will be one tooth advanced. Here is a quote from the above link that BAX, who is the warrantee manager for OS in the U.S., posted on here....
"Insert the cam gear so that the timing mark is in a direct line with the center of the cam followers and the centerline of the pushrods. It is NOT at a 90 degree angle to the crankshaft. The angle will be slightly back. "
The mark has to be either opposite or aligned with the pushrods and cam followers.
The best way is to remove the rocker arm assembly and raise the cam followers up out of the way. Then align the dot exactly where the cam follower would be. The gears are helical and the cam will twist a little going in. But when it's properly aligned, the mark will be right where the cam follower would be when the cam is seated.
One other problem of putting the mark opposite the cam follower is that you cannot be certain that you are exactly opposite the cam follower.
The cam moves at half the speed of the crankshaft therefore, the timing mark could be set either aligned with the cam followers or opposite them and the engine would still be in time.
There is a OS Four Stroke book written by some guy from England and printed by RCM and sold by others as well. This book describes setting the timing as Jaka (apologies) has said but it doesn't work very well on the front cam engines unless you are very lucky.
The clearance is .002" to .004" on the rocker arms for you guys in the U.S.
For the rear cam engines, there is a slightly different sequence that I could throw on here if anyone needs it?
Enjoy,
Jim