Rear sprocket

[ribbert]

I have just fitted a 17" rear wheel to my "93.  It is a 5 1/2" Yamaha with underslung caliper and same spoke pattern but came out of an FJ so original model is unknown to me. It has 4 teeth  more than the original and a ride today revealed an expected increase in revs ( and acceleration!) which I could live with  and a nasty dive in fuel consumption, which i can't. Without pulling the wheel, can anyone tell me if the sprockets are likely to be interchangeable?


Also, with standard dogbones, what would be a reasonable amount to raise the fork tubes. ie. by how much should they protrude through the top yoke?  They are currently flush.

Thanks

Noel

[andyb]

Don't know which wheel that is.  Possible suspects include FZR1000 (it interchanges with the FJ sprocket), YZF1000 (also okay), XJR (dunno), but I'm wondering more likely if it's from a YZF750 (should also interchange).  The underslung caliper wasn't used on the FZR, but both big YZF's had it.

Measure it a bit and eyeball things.  Odds are if it's a yamaha wheel of the 3-spoked style, it should swap, and if it doesn't you're only out some reassembly time, if you still have the old sprocket laying about.



If the fork tubes are flush with the top clamp, what's holding your bars on? Stock bars are above the clamps.  If you mean it's flush with the top of the clipons, try 10mm, there isn't very far that you can go without fouling the original master cylinders unless you're using different ones.

[Travis398]

here is the FJ sprocket, does yours look like this?

[Arnie]

Ribbert,

You could also put an 18t countershaft sproccket on (assuming you currently have a 17) and the overall ratio should be very close to OEM.

Arnie

[ribbert]

Ribbert,

You could also put an 18t countershaft sprocket on (assuming you currently have a 17) and the overall ratio should be very close to OEM.

Arnie

Thanks Arnie, but I already have the smaller rear sprocket on the old 16" wheel and with chains and sprockets not too far off I wanted to wait till then to replace all at same time.

Noel

[fj1250]

Order an18T from PBI sprockets.
Good product, reasonable prices and will ge tyou back to near stock gearing.
MC

[Arnie]

Order an18T from PBI sprockets.
Good product, reasonable prices and will ge tyou back to near stock gearing.
MC

Only concern I'd have about using their sprockets is that the online catalog only shows ALUMINUM sprockets for the rear.  While these would work on the FJ, they wouldn't last very long.  And, while they include shipping in the US (for orders over $75) - Ribbert is in Australia.

Arnie

[AustinFJ]

Order an18T from PBI sprockets.
Good product, reasonable prices and will ge tyou back to near stock gearing.
MC

Only concern I'd have about using their sprockets is that the online catalog only shows ALUMINUM sprockets for the rear.  While these would work on the FJ, they wouldn't last very long.  And, while they include shipping in the US (for orders over $75) - Ribbert is in Australia.

Arnie

If Ribbert doesn't mind waiting, I'm headed into Melbourne at the end of June.  Happy to carry it with me.  I'm pretty sure the C/S sprockets are steel. 

Greg