I swapped in a Renthal 14t countershaft sprocket today. I noticed there was quite a bit of clockwise/counterclockwise play in the stock sprocket to spline fit. When I installed the Renthal sprocket there was identical play. I remember there was a problem with a few 610" where the shaft was not adequately case hardened or some such issue, and the back and forth play on acceleration/deceleration wore the splines down requiring installation of a new countershaft. Apparently some sprockets fit tightly with no such play. Is such play normal for countershaft sprockets? I'd hate to shell out for second new sprocket just to have a tight fit ....
You will always have a little play. Even a sprocket that has to be tapped on will loosen up over time. I hold a small ruler at the 12:00 tooth. then measure the play. 1/8th inch or less is fine. If I'm at a loose 1/8th or more, I replace it!! The price of a spline stripping out on a ride, add in the repair cost and you can buy a truck load of CS sprockets. I also have to have a piece of mind, I ride alone a lot. Make sure the splines are clean and free of rust, then put on some drive shaft spilne high pressure moly grease, (like they use on BMW's) that will give it some cushion and protection.... I'm at 14000mi. and no problems..... Have fun.... PS. I use SUPERSPROX, they tap on tight, and go for around 15.00.....
Personally, I would change a sprocket way before it had an eighth of inch play. Some of the aftermarket sprockets don't fit as well as others. All of the Ironman sprockets I have bought fit very well
I'm going to hazard a guess here - that the 1/8" he's measuring is at the tip of the sprocket tooth, which would be a much smaller amount of play at the spline. It still sounds a bit excessive though. I'll have to go have a look at mine. My Renthal 14t felt absolutely normal going on....no excess slop, but not a tight fit requiring a tap either. A tap was required to get it on far enough to get the circlip to pop into the groove
I did not actually measure it, but it felt like at least 1/8" inch at the outside (teeth) of the sprocket. Having had a 610 and hearing of spline wear through, I wondered. So I have an Ironman 14t on the way, they said I could send it back. But they were knowledgeable about Husky splines being amongst the largest and described how in the punchout of the sprocket blank this can translate to more slop. Anyway they said theirs would be snugger. I hear Supersprox are also a better fit...Renthal probably copied the stock sprocket without regard to the actual spline dimensions...
Correct, 1/8 at the top of the tooth. I consider that max. myself, when I get close to an 1/8th I replace it, and don't forget the spline grease. But don't forget, I'll bet there's a million guys out there that never touch it and never have trouble either, but we're way cooler than that.......lol PS, I had a supersprox that I didn't think I get on, then others tapped right on so you never know..
OK, I pulled out a tape meaure, only goes to 1/8" inch. The stock sprocket had at about 1/16" play visually, felt like a lot more. Probably just fine, but if it loosens up with wear, quite possibly not. The Renthal meassured out the same visually, but felt like ever so slightly less slop. Perhaps they copied the stock sprocket and not the spline measurement. The Dirt Tricks Ironman sprocket had about half the slack as the stock and Renthal or in the region of 1/32" or less. I was hoping for better However, with the circlip installed, there is no discernible slack with the Ironman, whereas the stock and renthal had the same slack with the circlip in place, maybe it is slightly thicker and the circlip bears enough friction to immobilize it? So I am keeping it, the supersprox may be tighter but I don't like the dirt groove design sprockets, narrower interface with the chain may increase the wear rate. Also a little gap for heat expansion is not a bad thing, my garage is 60 degrees right now. But the Supersprox is almost half the price of the Ironman. I also received a Supersprox Stealth rear sprocket, steel aluminum riveted hybrid. I knew I would wear the stock Supersprox aluminum sprocket which would in turn stretch and wear out the chain prematurely. I think the Ironman steel sprocket may be lighter than the Supersprox Stealth, however they don't have a Husky 42 tooth rear. The stock aluminum sprocket weighed in at 9 3/4 oz and the Stealth at 20 3/4 oz But it will last and not wear out the chain. Yup, gotta wicked case of OCP, overthinking the litlest thing, when i really should be out riding. I bought my 610 used and was the 3rd owner, this 630 I purchased brand spankin' new and intend on keeping it a long while.
