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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 24 Feb 2013
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Post XT 600E countershaft sprocket

I went to change the countershaft sprocket on my 1991 XT600E. This type is held with a single nut and lock washer.

The sprocket on there had been modified, and instead of being 15.6mm thick (this is the overall depth of the sprocket listed for the model and of the new one I bought), it had the flange reduced so that it was only 9.6mm thick.

The reason I found for this was that there was a splined spacer, 6.2mm thick behind it, i.e. next to the oil seal plate, so spacer plus modifed sprocket = 15.8mm.

The manual does not show a spacer there. Has any one else come across this? Was this a mod someone did in the past to accomodate another sprocket? My XT runs the standard 520 chain ( i.e it has not been modified to take a 530). I plan on simply removing the spacer and using the standard 15.6mm deep standard sprocket.

Cheers

Last edited by XT306; 24 Feb 2013 at 10:45. Reason: updated information
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Old 24 Feb 2013
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When you say the flange, your not on about the width of the sprocket where the chain sits? its not been modded to take a 525 chain has it?

Mezo.
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  #3  
Old 24 Feb 2013
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Quote:
Originally Posted by XT306 View Post
I went to change the countershaft sprocket on my 1991 XT600E. This type is held with a single nut and lock washer.

The sprocket on there had been modified, and instead of being 15.6mm thick, it had the flange reduced so that it was only 9.6mm thick.

The reason I found was that there was a splined spacer, 6.2mm thick behind it, i.e. next to the oil seal plate.

The manual does not show a spacer there. Has any one else come across this? Was this a mod someone did in the past to accomodate another sprocket?

Cheers
Maybe the PO got a sprocket for the TTR600, they are thinner. But the splines on the counter shaft are the same, so the sprocket fits on the shaft.
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Old 24 Feb 2013
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Hi

I replaced my worn standard front sprocket with a renthal one. I was confused as well because the renthal one was thicker than the one it was replacing. After much head scratching i finally found the spacer, removed it and everything lined up as it should! I couldnt find any reference or mention about this spacer in the manual either. Hope this helps

Bill
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Old 25 Feb 2013
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Smile Xt 600e

Thankyou! It's a relief that someone else came across the spacer as well!

Cheers.
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Old 7 Jul 2014
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I just found a worn spacer behind the sprocket of my 2003 4pt!
It is about 4mm thick, the sprocket number is JTF1577-15. According to the JT website it is 9.5mm thick so Plus spacer gives 13.5mm
The replacement part is listed as JTF577-15 (15.65mm thick).
So it looks like there is no spacer needed with the new 577 sprocket.
Hope this helps. and I hope it fits.
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