the crank gear is a 7 way with the key in the 4a slot,so there is markings on the outside of crank gear with the settings and dots to line up.but there is a single dot at 0 that looks like the cam gear.after looking up the part number for top gear its a pro gear timning set.so i went on there website.the tr series shows a 3 bolt with a 3 way crank gear.the 4000 series shows the only one with a 9 way crank gear but a single bolt cam gear do agree with timing.i talked to thumper.he says his carbs are ready to go out of the box and no settings needed.i never did find nothing wrong with the carb and the intake gaskets is correct.i emailed pro gear see if they can send me instructions