Front and Rear Sprocket Install

I decided to go with Sprocket Specialists for my sprockets. I ordered a 15 front and a 45 Stealth rear. The Stealth sprocket has an aluminum center with steel teeth to last longer. It looks pretty trick also. I ordered my sprockets from here.

You can calculate your new top speed with different sprockets here.

I've been getting asked a lot lately about how much of a difference these sprockets make and whether or not it is necessary to get a new chain. When the bike had the stock sprockets it would barely come up in first under full throttle. Now the bike will power wheelie in second like nothing. The sprockets also make first a little hairy under full throttle because of how fast it will come up. The acceleration has drastically improved. I asked quite a few people about whether or not it was needed to replace the chain and the general consensus I got was that as long as you are under 2000 miles it is not necessary. As far as switching to a 520 chain for the less weight, I don't know if it would even be noticeable.

The following part numbers are only correct if you decide to use the stock 525 chain like I did:
FRONT: 592-15
REAR: Stealth 821

Stock sprockets below.

Rear Sprocket

SECTION 15-8 IN THE SERVICE MANUAL. First put the bike up on a rear stand. You need to set the chain slack as loose as it will go. Then you have to just loosen the axle nut and then use the chain adjusters on both sides. Next you need to remove the axle. I used a 1+1/4" six point socket on the right side and the 27mm closed end wrench that came in the bike's toolkit on the left side to remove the axle nut.

Once you have the right side axle nut off, have someone hold the wheel while you pull the axle out from the left. Once the axle is out you can move the wheel forward and remove the chain. Then you want to pull straight back and be careful of the rear brake on the right side. You can rest the brake on the swingarm. When the wheel is off, set it on the ground and remove the six 17mm bolts holding the rear sprocket on. I had someone stand on the wheel while I removed and installed the rear sprocket. It helps you get more leverage and keeps the wheel from moving around. The sprocket is attached to the damper cover and they both will fall off if not held on. No biggie if it does fall off, just put it back on and put the rubber dampers back in the wheel. Make sure your new sprocket is on correctly and then reinstall the six nuts at 47ft/lbs each. The hardest part of getting the rear wheel back on is getting the chain on the wheel and getting the rear brake to slide in the groove all at the same time and then getting the axle in. I had to slightly pry open the brake pads with a screwdriver so they would fit back on the disk. You can see the slot the rear brake fits into in the picture below.

Once you have the rear wheel back on and the axle in the wheel just hand tight the rear axle nut. You need to set the chain slack now unless you are also installing a front sprocket. Once you have set the chain slack tighten down the rear axle nut to 83ft/lbs. The rear wheel of the bike should start to lift up if you are using the right amount of force.

Front Sprocket

Loosen the rear 1+1/4" axle nut and set the chain slack as loose as it will go. Remove the allen bolt holding the shifter lever in the picture below.

Move the shifter lever out of the way and remove the two 8mm bolts holding the front sprocket cover on.

Put the bike into 1st gear to keep the front sprocket from moving and then remove it with a 14mm socket. Put on new sprocket and get the chain on it. Tighten the front sprocket bolt down to 40ft/lbs. Put the sprocket cover gasket you can see below back onto the cover and line up the holes. Reinstall the front cover and then set your chain slack.

Once you have set the chain slack tighten down the rear axle nut to 83ft/lbs. The rear wheel of the bike should start to lift up if you are using the right amount of force.

This install guide was written by Luckydevil, and was slightly modified to fit this site. It is used with his permission.

KQ Manual

TampaBikers
Up

This site is partialy sponsored by

***************************************