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?

TheChairman · 12-28-2020, 09:21 AM

What year?

I've noticed the exact same thing, and I had this suspicion. I never removed the cover, though.

I recently bought a new chain and sprockets and have yet to install them.

mtiberio · 12-28-2020, 11:40 AM

2020

Gimpster · 12-28-2020, 12:50 PM

https://cscmotorcycles.com/oem-parts...counter-shaft/

Worlds smallest parts diagram picture, but looks like every gear is straight cut.

TheChairman · 12-29-2020, 03:24 AM

Quote:

Originally Posted by mtiberio

2020

Yep. Mine is a 2020 as well.

I remember asking about the noise here and everyone just said it was clutch chatter. I always felt it was coming from the left side, not the right.

Question is, will CSC warranty this? Is it actually a problem?

mtiberio · 12-29-2020, 05:10 AM

I called them yesterday, talked to a tech. He had a TT on the lift. Says they all do that (axial play). I have found that running the chain too loose allows the chain to fling off the CS sprocket (I assume), and hit the case/cover. I usually run my chains loose because tight is so bad, but now I watch it. Given I replaced the OEM POS chain with a proper o-ring chain, rapid loosening should not be an issue. I was thinking of pulling the CS sprocket again to see if the addition of a hardened washer between it and the case could help tighten things up. At this point with my chain properly adjusted, the noise is gone. If I thought it was a real issue, I'd go with a 16/40 sprocket pair instead of the 17/42 I'm now running. Compared to my 2016 TT, this 2020 is of lower quality. I wonder if this is a result of trying to hold prices given the tarrifs. My battery is a total POS, I have to keep it on a charger all the time or I only get one crank before crickets.

TheChairman · 12-29-2020, 08:10 AM

Could be.

I already replaced my battery. It croaked at the slightest whiff of below 50 degrees, and was only holding on by a thread before that.

Mudflap · 12-29-2020, 08:29 AM

Every CG engine I've owned had quite a bit of axial play in the countershaft, but even a wide Oring chain did not contact the case or cover.

mtiberio · 12-29-2020, 08:38 AM

Quote:

Originally Posted by Mudflap

Every CG engine I've owned had quite a bit of axial play in the countershaft, but even a wide Oring chain did not contact the case or cover.

How many teeth on CS sprocket?

TxTaoRider · 12-29-2020, 09:27 AM

The 13t 530 sprocket and stock 530 chain cleared the case, but when I changed to an x-ring chain it rubbed the case (I could feel it catching when I pushed the bike in neutral). I "clearanced" it with the dremel, but I'm going back to the 12t front and smaller rear sprocket because I really don't like the chain being that close.

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
	0

12-28-2020, 11:40 AM	#3
mtiberio Join Date: Jun 2016 Location: Arlington, VA Posts: 258	2020 __________________ 4 time WERA SuperVintage Roadracing National Champion, SCTA Land Speed Record Holder, 3rd AMA Motorcycle GP of Miami
	0

12-28-2020, 12:50 PM	#4
Gimpster Join Date: Dec 2020 Location: Palm Bay, FL Posts: 29	https://cscmotorcycles.com/oem-parts...counter-shaft/ Worlds smallest parts diagram picture, but looks like every gear is straight cut. __________________ 2020 RPS Hawk DLX My Hawk DLX info page: https://www.ecimulti.org/hawk250
	1

12-29-2020, 05:10 AM	#6
mtiberio Join Date: Jun 2016 Location: Arlington, VA Posts: 258	I called them yesterday, talked to a tech. He had a TT on the lift. Says they all do that (axial play). I have found that running the chain too loose allows the chain to fling off the CS sprocket (I assume), and hit the case/cover. I usually run my chains loose because tight is so bad, but now I watch it. Given I replaced the OEM POS chain with a proper o-ring chain, rapid loosening should not be an issue. I was thinking of pulling the CS sprocket again to see if the addition of a hardened washer between it and the case could help tighten things up. At this point with my chain properly adjusted, the noise is gone. If I thought it was a real issue, I'd go with a 16/40 sprocket pair instead of the 17/42 I'm now running. Compared to my 2016 TT, this 2020 is of lower quality. I wonder if this is a result of trying to hold prices given the tarrifs. My battery is a total POS, I have to keep it on a charger all the time or I only get one crank before crickets. __________________ 4 time WERA SuperVintage Roadracing National Champion, SCTA Land Speed Record Holder, 3rd AMA Motorcycle GP of Miami
	1

12-29-2020, 09:27 AM	#10
TxTaoRider Join Date: Oct 2020 Location: Flower Mound Texas Posts: 904	The 13t 530 sprocket and stock 530 chain cleared the case, but when I changed to an x-ring chain it rubbed the case (I could feel it catching when I pushed the bike in neutral). I "clearanced" it with the dremel, but I'm going back to the 12t front and smaller rear sprocket because I really don't like the chain being that close. __________________ 2021 Tao Tbr7 - "Lucille" Mods so far- Brozz swingarm, 21" front rim (Bridgestone Tw302 rear/Dunlop D606 front tires), Digital gauge cluster, pz30b pumper carb, after market hand guards, aftermarket brake and clutch levers, round fold away mirrors, Fly handlebars shortened slightly, 13t front sprocket 2009 Q-link Legacy 250 1982 Suzuki GS1100ES - "Jolene"
	0

12-28-2020, 09:21 AM	#2
TheChairman Join Date: May 2020 Location: Philadelphia Posts: 115	What year? I've noticed the exact same thing, and I had this suspicion. I never removed the cover, though. I recently bought a new chain and sprockets and have yet to install them.
	0

12-29-2020, 08:10 AM	#7
TheChairman Join Date: May 2020 Location: Philadelphia Posts: 115	Could be. I already replaced my battery. It croaked at the slightest whiff of below 50 degrees, and was only holding on by a thread before that.
	1

12-29-2020, 08:29 AM	#8
Mudflap Join Date: Sep 2014 Posts: 1,870	Every CG engine I've owned had quite a bit of axial play in the countershaft, but even a wide Oring chain did not contact the case or cover.
	0