countershaft end float

mtiberio · 12-28-2020, 08:43 AM

My TT250 stock 17 tooth front sprocket (chain actually) rubs the countershaft cover and the engine case. Worse now with an O-ring chain. It is slight, but I can feel what I thought was clutch chatter when this happens. I have relieved the offending areas with a dremel. I replaced the front sprocket just in case it was wallered out, it wasn't. The splines on the countershaft were fine too. I did notice that the countershaft can move in and out (axial play) about 1/8". I didn't put a dial indicator on it, so that is a guess. Is this normal? Does anyone know if the gears on that shaft are helical cut (causing thrust loads) or straight cut?

12-28-2020, 08:43 AM	#1
mtiberio Join Date: Jun 2016 Location: Arlington, VA Posts: 258	countershaft end float My TT250 stock 17 tooth front sprocket (chain actually) rubs the countershaft cover and the engine case. Worse now with an O-ring chain. It is slight, but I can feel what I thought was clutch chatter when this happens. I have relieved the offending areas with a dremel. I replaced the front sprocket just in case it was wallered out, it wasn't. The splines on the countershaft were fine too. I did notice that the countershaft can move in and out (axial play) about 1/8". I didn't put a dial indicator on it, so that is a guess. Is this normal? Does anyone know if the gears on that shaft are helical cut (causing thrust loads) or straight cut? __________________ 4 time WERA SuperVintage Roadracing National Champion, SCTA Land Speed Record Holder, 3rd AMA Motorcycle GP of Miami
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