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I have a 01 scrambler 400 and its all stock except for a fmf silencer can any one tell me what mods i can do to make it faster.
 

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faster as in acceleration or top speed?

if you want more acceleration and can afford to loose some top speed, you can change your gearing. its one of the cheapest noticeable things you can do.

clutch kits, pop a few holes in your air box (make sure you change your jetting to match), loose some weight off of the machine, run i light mixture of race gas and reg. fuel. ignition upgrades, big bore kit

all depends on how much you want to spend
 

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the cheapest, easiest, and probably most reliable mod for adding acceleration is drop 1 tooth on the front sprocket, and possibly add 2-3 more teeth on the rear.

for every 1 tooth drop on the front is like adding 3 teeth to the rear sprocket. so a -1 drop on the front and +3 on the rear is the same as just adding 6 teeth to the rear. this is going to give you a very noticable increase in acceleration
 
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