I have a 04 300 with a custom made pipe like the eliminator pipe for the trx 250r. So the jetting on my quad is a bit different from the stock, 38 iddle and 185 main, with no washers on the power valve. It rides like a rocket, banshee style...but the plug is a bit too clear on hi revs.
The most important tuning I did was to put uniball rods onthe upper a arms linking the chassis to allow tuning the caster, and reducing rider arms fatigue.
best luck!
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