I bought at Dr350 last summer and have been riding it ever since (love the thing).  I recently moved and would needdrive it alot more at higher speeds to get to the city.  I want a bigger sprocket in the front, pretty much the biggest sprocket that will slide right on.  I have found 16 tooth front sprockets but i have read that i may need to grind down some stuff for clearance which i want to try to stay away from. I have not counted my sprocket sizes because the bike is not currently at my house (no room in garage with all the boxes, plus its still a little cold in Wisconsin), but I pretty much want the biggest front tooth i can get.  I am assuming that the bike has stock sprocket sizes but i do not know for sure.

My questions are:

1) What are the stock sprocket sizes?
2) Does a 16 tooth front sprocket need grinding to fit?
3) Anyone with a 16 tooth front sprocket know what RPM you are at in 6th gear going 65?
4) If im only adding 1 or 2 teeth to the front sprocket do i need to adjust my chain?

Thanks for the help in advanced!!

trevor_clay_10, on 30 April 2012 - 09:53 PM, said:

1) Stock sprocket sizes varied by year -- my 92 came with 14/43.
2) You will need to grind your case saver to fit a 16 tooth -- I run a 15, and a little grinding was required.  The case saver is an easily replaceable part in the 10-15 dollar range, so you are not modifying anything that is not easily replaceable.
3) I run 15/43. At 65 I am turning about 6300 RPM.
4) Yes, you will need to adjust the chain for 1-2 teeth.  I carry a 13-tooth sprocket with me, and swap at the trail head.  I can swap the sprocket and adjust the chain in 10 minutes or less.

Thanks for the quick responce!

Now i have a couple more questions:

1) Mine is a 1997, any clue what the stock gearing on that is?
2) The "case saver" is just the little metal peice in case your chain breaks right?
3) Is there a write up on how to adjust your chain as i have never done it before?
4) Is it okay to run it at ~6500RPM's for long periods of time? Say at least an hour or more?

I had a 94’ for awhile and ran a 15/41. Seemed to do real well. Kept the RPM’s at around 60mph just under 6k.

The bike should do 6.5k RPM until the cows come home. An hour should be a piece of cake.

trevor_clay_10, on 01 May 2012 - 11:11 AM, said:

Mines a '99 SE. It does about 6.1K at 60 and I did a 314 mile ride a few weeks ago, at least 200 of it was doing 60-65 ish and I think it's fine. In the future I'll change sprockets for long trips.

Right now my bike does 65 at 6500 RPMs so idk if it would be worth changing out the gears but it wouldnt cost very much so i might just do it and see how big of a difference it makes.

I had a 15/44 on my 98. went to a 13 front and like the bottom end better. No issue with the chain. just pull the wheel back until there is about 1" of play in the chain at the most. Make sure the snail adjusters the same. and tighten. If you are changing sprokets, I recommend a new o-ring chain as well. You have to play around with the proper length to cut it too.