5/8" Front sprocket spacer

[TurboChris]

Hey, Isleoman.....what kind of footpeg/passanger peg assembly set up is that? STUNNING bike......great job.

[Kaptain Ketchup]

My solution:









1. Cut (after stress relief) a plug out of old sprocket (motorcycle junk yards give them away).

2. Countersink good sprocket just enough to get a spocket in around the nut.

3. Use old output shaft with old bearing and spacer installed to square it all up and turn the sprocket nut on loosely.

4. Preload both sprockets with a hanging weight (I epoxied a 2 ft rod on each and hung paint cans on them) to make sure the spline surfaces are straight and the weld (or the small set of teeth) don't end up taking all of the load.

5. Weld.

6. Case harden.

Only cost me the new sprocket and some time. I made a set 14t - 17t and a few extras while I had the jigs out.

[isleoman]

Hey, Isleoman.....what kind of footpeg/passanger peg assembly set up is that? STUNNING bike......great job.

TurboChris, Thanks, don't want to highjack this thread. You can see more on my ZX12 rearsets in this thread. http://www.thegsresources.com/_forum...d.php?t=113711

[kichigai]

Im glad Im not the only one still dinking with the offset sprocket question! Here is my topic that I started a while back. I bought a 5/8 offset but am not 100% happy with it so far and may try a 3/8 or a 1/2 instead. I will be posting up as soon as I do some more research.

http://www.thegsresources.com/_forum/showthread.php?t=115688

As for the question regarding the outboard bearing spuuort kit, Precision Metal Fab Racing (PMFB) still makes them but it is very expensive at $395.00. Personally I dont think its needed unless you plan on using your bike for racing. The tech support guy at PMFB said the same thing.

[rapidray]

Kichigai, for all that we are doing to build dragbikes & custom streetbikes, that PMFR offset kit is NOT expensive! I have 2 of them & the workmanship in them is a DEAL at $395.00! All you guys that want to move your countershaft sprockets out withOUT supporting the sprocket are just asking for trouble! I don't care how long you have been riding that way or whatever your story is. The reason for the support is to prevent bearing failure due to overloading the bearing! Once you lose an output shaft bearing and all that metel goes THROUGH your oil pump you will listen the next time. Ray.

[liloaty]

Ray, I fully understand WHAT can happen if the shaft bearing fails, but do you have any proof to support that it happens regularly on a relatively stock motor? I mean if you look at the numbers, you are moving the sprocket out 5/8", thats not putting that much more load on the shaft bearing.

I'm willing to pony up the extra money if there is some proof to support that the shaft cant take it...

[kichigai]

Rapidray, I appreicate your tech knowledge and comments! I was hoping someone would jump in and provide some pro/cons.

I made up my decission not to get the support kit based on a conversation with the tech from PMFR who told me that for a stock motor I shouldnt need it.
He did though highly recommend it if I was to do any racing with my bike!

Like Liloaty, I dont mind spending the extra costs if it truely is needed, and would be interested to hear of anyone that have experienced shaft bearing problems due to using a offset sprocket. Thanks! :-D

[lecroy]

Kichigai, for all that we are doing to build dragbikes & custom streetbikes, that PMFR offset kit is NOT expensive! I have 2 of them & the workmanship in them is a DEAL at $395.00! All you guys that want to move your countershaft sprockets out withOUT supporting the sprocket are just asking for trouble! I don't care how long you have been riding that way or whatever your story is. The reason for the support is to prevent bearing failure due to overloading the bearing! Once you lose an output shaft bearing and all that metel goes THROUGH your oil pump you will listen the next time. Ray.

What he said! Damaged cases.....

[liloaty]

What he said! Damaged cases.....

Details on this? Your bike? How much power were you pushing?

[lecroy]

Details on this? Your bike? How much power were you pushing?

This particular bearing (output shaft, sprocket side) failed on my first 83 GS1100 I'm thinking after it was maybe a year or two old was all. Maybe I had a pipe on it, but nothing radical back then. I think they were rated for 108HP. I was pretty hard on the bike though. No problem with it sucking the *@%^$*@%^$*@%^$ments into the pump. The engine locked tight and the bike slid to a stop. The main problem with a ball type bearing like this is that it can not take a lot of load at zero speed. I started to replace this bearing on a regular basis.

I doubt many people use the stock bearings and shafts in their race bikes.

I agree with Ray and Kris on this one, wider tires and moving the sprocket out will just compound the problem. Then again, if your just after the look and don't beat the crap out of it, should be fine.

[liloaty]

Whew thats some really bad luck! Did you have a widened tire on it? How much in damage did that end up costing you?

[lecroy]

Not so much bad luck. I was just more ignorant back then.

I'm guessing I still had the factory tire on it, or I used to run Dunlop K491s or some thing like that back then. Stock size tires for sure.

Back then I could buy a brand new set of cases for $500 from the dealer. Now they cost damm near that used, when you can find a good set. I think I just bought the cases, new bearings, gaskets, a tire and a days worth of work. Bike stayed upright.

[Kris V]

Wait until it does it at over 100mph:shock: then it get`s fun

[liloaty]

Whew that's crazy. I wonder how often that really happens. I ran some numbers and moving the sprocket really doesn't increase the bearings load much at all...

[Kris V]

Did you factor in a wider contact patch from the tire? How about the different rim and possibly a heavier tire?