520 Offset sprockets

[salty_monk]

Revision to the above, I'm going to need a 6mm spacer not 7mm

[80GS1000]

Randy at Advanced Precision in Oregon did my 520 offset front sprocket. Very high quality for $60. http://www.manta.com/company/mm8q7fn

[salty_monk]

Good info PJ, thanks!

Randy Boyd

Advanced Precision Products

87906 Bill Creek Ln
Bandon, OR 97411-9165

Phone: (541) 347-7262

[NorCalSuperF]

I purchased my 520 c/s from Randy at Advanced Precision and I'm 100% satisfied with their product. Thanks to 80GS1000 for the contact info that was in his project thread.

(Advanced Precision is also the shop that mfg's the sprockets retailed by the "katman" at his website.)

NorCalSuperF

[Billy Ricks]

Billy, that's the offset you needed with the 160? What clearance do you have between chain & frame & wheel & frame?

Should help to double check my measurements.

Cheers,

Dan

I just installed the Advanced offset sprocket this past week. I think I actually had mine done with 1/4" offset and 17 teeth. I was running a Vortex 520 conversion meant for a '92-'95 GSX-R. It had a small amount of offset that kept the distance between the tire and chain, and the frame and chain about equal. The chain wasn't running quite straight so I milled down an old sprocket to have a geared spacer behind the sprocket to move it out. I went as far as I could and still have the lock for the nut still catch splines. The chain was still running in a little more than I wanted it to be. Here's the GSX-R sprocket dimensions.


With the Advanced sprocket I have almost 1/2" between the tire and chain and a little less than 1/4" between the frame and tire. 1/4" offset would probably work well for you with the 170.

One thing about tooth numbers, the 16 I was running was no problem at all. With the 17 tooth sprocket I had to grind down the rear center bolt casting on the cover to get clearance. The teeth with a 17 make contact so I had to grind down the forward portion of the casting almost to the dowel.

[Billy Ricks]

One other thing, the 16/43 combo I had on would keep the mph/rpm ratio close to stock with the new wheel. With my carbs, pipe, and head it ran past redline in 5th doing 130 just before the swap. With another 100 yards I think it would have gone another 5. I'm anxious to see if it will do the same with the 17. Should be good for another 6 or 7 mph if it will.

[salty_monk]

Billy I went with the 16/42 as your advice. I noticed the tight space with the rear case bolt, wondered if you'd had to deal with that.

You're right, looks like 6mm or 1/4" will be fine. I have one of those conversion sprockets too.

Dan