Counter sprocket spacer

[FJscott]

I have all the parts assembled to do the GSXR rear wheel mod. I have read all the threads and files and the only question I have is in regards to spacing the countershaft sprocket out. I have a 5.5in rim. Does anyone know ow thick the spacer needs to be? Thanks in advance,

Scott

[markmartin]

I did the GSXR 5.5" rear wheel swap and did not make any modifications to my front sprocket. 

Mark M

[FJmonkey]

I flipped the GSXR sprocket so the offset moves the chain inward. Then I spaced the front sprocket out the same distance I milled off the ridge on the face of the sprocket, about 0.030 of an inch. I will have to check my notes when I get home. This prevents me from using Dunlop tires in the 180 size, they are more like 190. The 170 Dunlops fit and the Conti Motion in 180 clears the chain just fine.

[FJscott]

Good info. Thanks

[aviationfred]

I did my GSXR rear wheel mod exactly as the write up directs. Everything lines up perfectly. I have used Metzler Roadtec Z-6 and currently have Continental Conti-Motions. Both 180/55/17 and had no clearance issues with the chain.

http://www.fjowners.com/index.php?topic=3380.0

I did shorten the Caliper torque arm 2 1/4" to get the caliper to sit 90 degrees to the axle.

Fred

[FJmonkey]

Checked my notes, 0.040 of an inch, I was hoping to get 0.055.

[FJscott]

Ok, now I'm confused. You flipped the sprocket to bring the chain inboard then took .060" off the counter sprocket which brings it inboard too? Thanks for looking back thru your notes.
I was hoping to not recreate the wheel( pun intended) but looks like there has been
Different approaches to achieve parralel sprockets. Again, thanks for the info.

Scott

[FJscott]

Thanks Fred

[FJmonkey]

Ok, now I'm confused. You flipped the sprocket to bring the chain inboard then took .060" off the counter sprocket which brings it inboard too? Thanks for looking back thru your notes.
I was hoping to not recreate the wheel( pun intended) but looks like there has been
Different approaches to achieve parralel sprockets. Again, thanks for the info.

Scott

I pushed the front out 0.040 to keep the chain aligned. I am not a degreed mechanical engineer, but I function like one. I measured my OEM rear and the GSXR rear when I did my upgrade. This was a short on time and budget thing, I had a Rally to attend and I was not going to miss the Rally!!! 

So I did not not want the chain to be out of alignment enough to cause failure. The VFR offset sprocket is in my shopping list to flip the rear back over and use the Dunlop 180 tires....

[movenon]

On my 1990 I just flipped the rear sprocket over and installed a Honda VF 1000 F  front sprocket on. My rear wheel sits dead center aliened with the front end.
The VF 1000 F sprocket has the same splines as the FJ. You will have to grind one of the bosses off.
For dimensions refer to http://www.jtsprockets.com/catalogue/model/4872

The stock FJ sprocket is 10.8mm overall width

              VF 1000 Sprocket 14.5 mm

You gain about 2mm of offset. I also found a Motion Pro chain alignment tool handy. At first I did the eye ball thing and it looked pretty good. When I used the tool I decided to offset the front sprocket. The tool is cheap. http://www.motorcycle-superstore.com/14/71/995/4876/ITEM/Motion-Pro-Chain-Alignment-Tool.aspx?SiteID=Google_PLA995&WT.mc_ID=10012&esvt=0-GOUSC&esvadt=9-0-3886819-1&esvaid=30548&kw={keyword}&gclid=CMGIoPCA97kCFaFxQgodHAIANw . Cycle Gear stores also stock them.

I run a Michelin 180 55 Pilot Road and it clears slightly less than a 1/4 inch. It doesn't rub. Not all tires are the same though.

That's some of my experience with the front sprocket.
George

[movenon]

This is a picture of a socket that I ground the face down to get a better bite on the narrow front sprocket retaining nut. I jammed the face into a disk sander until most of the bevel was gone.



Might help  
George

[FJmonkey]

YOU killed it you rebel..... That socket will never be the same.... Good call.....

[FJscott]

Thanks George

[skymasteres]

I'll have to get a tool to really get precise on my chain alignment. But I just put my 93 GSXR wheel in and it seemed to line up fine with the stock front sproket without messing with the rear sproket that came on the wheel. The only caviot is, the chain rubs the 180 Dunlop that I have on the wheel. I took a angle grinder with a sanding disk and gound off the edge of the tire so that it's a 1/4" flat rather than an edge. But there's still just a tiny bit of contact.

[movenon]

I'll have to get a tool to really get precise on my chain alignment. But I just put my 93 GSXR wheel in and it seemed to line up fine with the stock front sprocket without messing with the rear sprocket that came on the wheel. The only caviot is, the chain rubs the 180 Dunlop that I have on the wheel. I took a angle grinder with a sanding disk and gound off the edge of the tire so that it's a 1/4" flat rather than an edge. But there's still just a tiny bit of contact.

I also have a 93 GSXR 5.5 rear wheel. I have the rim dead center in the swing arm and made sure it was in alignment with the front wheel. I mix matched the outboard GSXR rear wheel spacers.

The right side (thimble looking spacer)  I used the stock 93 spacer, (.553 wide) and stacked the spacer from the stock FJ rear wheel (about .515 inch wide).
On the left side I used  Suzuki  64751-40C00 it is .450 thick and 1 washer.

With those two spacers I think you have the shortest possable end to end measurement with the GSXR rear wheel conversion allowing you to stack spacers and or washers to shift the wheel where you need it.

A note: I think I sanded a bit of metal off the FJ rear wheel spacer (about .515 wide) in the final alignment. Plenty of meat to work with.
If you use a 93 GSXR wheel stock left spacer is really to wide.
If you use a 92 and earlier GSXR rear wheel, the stock spacers will work I think but there is not as much left or right wheel adjustment. No problem as long as it is centered.

I know this is old info for you Mike I am just throwing out the information for anyone else installing a 1993 GSXR rear wheel in the FJ.  
I don't know how precision the Motion Pro chain alignment tool is but it beats eye balling. And surprising works pretty good. You still end up eye balling but you have a reference point. Wouldn't be to hard to make a similar tool. You are just clamping a straight edge to the rear sprocket. The edge just has to be parallel with the rear sprocket and close enough to the chain to sight down.

In the end I also installed a Honda VF 1000 F 18T front sprocket. I am pleased with the alignment now and have no tire rub with the  Michelin 180 55 Pilot Road.  As fjmonkey stated the Dunlop 180 might just be a wider tire.... Or the Michelin is narrower than 180mm....
George