Yamaha TRX850 Enthusiasts Forum

As title says off set sprocket for use with YZF/Thunderace swingarm.






all work done by Paul

Thats impressive. does that push the chain in over or out over?

It moves the chain out, to allow for the wider yzf 750 wheel.

here are some better photos
standard sprocket

correct off set sprocket




job well done, this will also stop any damage to caused by the chain rubbing against the swingarm bracing.

Hi

Nice job.

All the usual questions---

Where from?

One off or any more available?

Cheers, Andy

Sorced by paul after a lot of research and modified by paul.
Mine will be done monday -Tuesday. will post all details end of next week.

Always was under the impression there was no mods needed for a yzf/thunderace do you defo need one of these?

Maybe I should check the state of my chain/sprocket after the 5000 miles it's done!

made a lazer alignment tool and the off set is 6.0mm when using a YZF/thunderace swing arm.

Is the spocket machined down?May I ask what the sprocket was from? Cheers

Yzf 750 ? help me out here. I put a 750 swingarm and wheel on, turned the sprocket over and everything is 100% aligned. What am a not gettin

Yoozy wrote:Yzf 750 ? help me out here. I put a 750 swingarm and wheel on, turned the sprocket over and everything is 100% aligned. What am a not gettin

When I get back in my garage I will take some photos with the chain on using the standard sprocket and some with the offset sprocket. Check how close the chain is to your swingarm, turning the rear sprocket only moves the chain over slightly and closer to the bracing on your swingarm to the point that it will mark it slightly.

Measurements for the yzf / thunderace swing arm pivot end with no caps on 253mm same as the TRX the wheel end YZF is 273mm and the TRX is 261mm a difference of 12mm so you will need to run an offset sprocket of 6mm to enable the chain to run in alignment. We have done this to our bikes and all lines up perfect, wheels are in alignment.





Hope this helps anyone wanting to do the YZF/THUNDERACE rear end conversion.

Any one else interested in this mod?

I've been watching my chain dance around all over the place due to poor alignment since i fitted the yzf rear. It gets perilously close to the swing arm too due to reversing the sprocket too.

Talking to Dixonj, this is not a cheap sprocket but worth it for chain alignment i reckon. As it is a modded sprocket, price may come down with numbers, so anyone else up for it?

Cheers, Andy

Guessing someone could try an old sprocket machined down and fitted like a spacer.

Had a blast with my yzf rear, one thought tho, the chain adjuster marks we use to align the wheel, if the corresponding marks aren't aligned correctly,then that would be something similar ?

I asked myself the questions, did the chain ever line up with the plastic guide on the yzf swing arm?

Does the chain run that close to the swing arm on a yzf750?

Did a fair bit of playing around getting the wheel straight in the swing arm but always resulted in dancing chain.

Cheers, Andy.