OK gents, I'm having a problem. I dropped down to a 13T countershaft sprocket (I think it's a Moose part), and I like it. But, I need to go lower for the tight trails. So I ordered a 12T from Rocky Mountain ATV. The part I got is made by Primary Drive (Part # 34212). It fits fine on the splines, but when I crank down the CS nut, it binds such that I get a lot of resistance to turning the rear wheel. It looks like the problem is that the inner shoulder in the Primary Drive part is not quite as thick as the one on the Moose part.

So, my question is, can I get an inner spacer for this, or do I just have the wrong part? Does anyone have a source and part # for one that for sure works?

I guess if it comes down to it, I can just go to a 45T rear, but I'd rather not buy a new chain if I don't need to.

Thanks!

 

Gobius
If you do go to the 45T rear I would be interested in your OEM 42T rear. I have a 14/45setup on mine with a 330/FCR and I find myself bouncing off the rev limiter some times. I had searched for a 44T as I think that would be Ideal for me but I could not find it.

RE getting the right sproket. You can search on this site and might be able to find one of the threads that has some good stuff on part#s for the right sproket. I think your right you need a sholder on the inside of the sproket to keep it from binding.

this site at JT Sprokets gives diagram, dimensions, and ratios. It shows that JT Sproket does not offer a 12T front but at least you have dimensions for the sholder. Hope it helps a little. BTW if you find anyone offering a 43T or 44T please let me know.

http://www.jtsprockets.com/52.0.html...sel_uid=967&p=

Cheers Jim

 

Man, I don't know...I don't think a 12T front sprocket for the KLX leads to healthy chain operation. While it will function, I think a 13 is as small as one should reasonably go on the KLX. Yeah, it's a PITA to need a new chain to raise the tooth number on the rear, but I think it's the best route. I went with a 14/47 setup, but your needs may vary.

 

I agree with not using a 12t, I would go 13/45 to get the gearing you want.

 

Yeah then I can get your 42T from you.
BTW I was on RMATV and they listed a 12T to fit our bikes. I am not 100% sure it actually would fit though.
Cheers Jim

 

Mate I have to agree I don't think a 12 front is a good idea, I went 13/45 and it worked well.

 

13-45 is in my opinion the perfect combination. I did have a machine shop make me a perfect spacer for my JT-Sprocket as it didn't come with the shoulder like the stock 14 had. I have had zero problems with it. I would not suggest trying to space it out with something off the hardware store shelf. Also a 12 is really gonna give the chain a workout, its better to go bigger in the back if you want more low end grunt.

 

i know this has been probably asked before, but can you use the stock chain with the 13/45 combination?

 

no, you need 2 more links, a 108 against the OEM 106

 

As far as a new sprocket and chain go, you can get a primary drive o-ring chain on RMATV for less than $50, and a primary drive sprocket for $20. I picked that combination up and it seems pretty solid for the short time that I've had it. More than a $9 front sprocket, but more reliable too.