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You can also mess up a stock 4-stroke by running pure race fuel.
Also, Cam2 or Turbo Blue is just as good and is about $4.00 a gallon.
 

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I agree there are many things that can be done to improve a bikes power/ speed, but if cost is a consideration then you may want to proceed in this order:
1. Replace the spark plug (gapped) $5
2. Race gas ( be careful about overheating with higher octane) $4-10/ gal
3. Change sprockets (smaller size less teeth on back) $20-60
4. Aftermarket pipe $50 - 150

Checkout this site, this is a windfall of information:
http://www.motocrossactionmag.com/M...0&tier=3&nid=3350AE5FB0614385A3AD55EC652C7592

Good luck, GM
 
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