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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