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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.
Photo by Marc Gibaud, Clouds on Tres Cerros and Mount Fitzroy, Argentinian Patagonia

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Photo by Marc Gibaud,
Clouds on Tres Cerros and
Mount Fitzroy, Argentinian Patagonia



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  #1  
Old 31 Oct 2008
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Most important mod:
Progressive fork springs. From Benny Wilbers for example.
You can also raise the fork oil level a bit as a cheapo alternative.

The OEM springs are too soft. Do not use spacers to increase preload as 1. this does not change the spring rate but only changes the ratio between positive and negative travel; 2. does not reduce brake dive; and 3. causes the OEM springs to "sag" (permanently shorten which aggravates the squashy front end problem as the reduction of the springs free length it causes a decrease of the spring rate).

Always replace both sprockets and the chain as a set. Partial replacement causes rapid wear.
Try not to go smaller in the front as smaller sprockets also wear faster. Rather go bigger in the rear. Remember that going bigger in the rear might require a longer than OEM chain. Try to avoid "even" transmission ratios like 15 : 45 with a 120' chain (kind of worst case scenario) or 16 : 40 with 96' chain for example as this causes periodic wear. Ideal is for example the Kawasaki KLR 650 with 15 : 43 and a 104' chain which excludes periodic wear.
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  #2  
Old 31 Oct 2008
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Quote:
Originally Posted by lecap View Post
... as this causes periodic wear.
What is periodic wear? :confused1:
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  #3  
Old 1 Nov 2008
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Quote:
Originally Posted by angustoyou View Post
What is periodic wear? :confused1:
Take my first example: 15' front sprocket and a 120' chain: After six revolutions of the front sprocket the same roller of the chain will mesh with the same tooth of the sprocket.
Same for the rear in this example: Six wheel revolutions will bring the same tooth in contact with the same roller. This is about as bad as it gets. A damaged front sprocket tooth always hits the same rollers. A seized roller always hits the same tooth on the front sprocket and the same three teeth on the rear.
In this case the chain is very likely to wear unevenly.

Compare with the KLR: 15 and 104 do not share common factors. Means the same tooth of the front sprocket meets the same roller only after 15 x 104 = 1560 turns of the sprocket and after every other tooth has met every other roller. Same between chain and rear sprocket.
The KLR's final drive should not wear unevenly.
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