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Biggest thing you can do is get a good aftermarket pipe.
 

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Dude !

alright dude everyone should know this but a great way to make a
4-stroke run faster is to use racing gas. Its very expensive [around $11.00 a gallon] but youll fly!
 

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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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Tree Magnet
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Jet it properly
Open th airbox
Aftermarket pipe

go to thumpertalk.com, and view the DRZ forum. there are dozens of posts about this.

dave
 

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sell em and get a 2 stroke lol i had a crf230 but i got rid of it for my kx 125 i wanted to do stuff to make the 230faster i was gonna go with a pipe and smaller sprockets if that helps
 

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Haha, I liked the "get a 2-stroke" idea. I know a guy who had a CRF 150 and it wouldn't keep up to a lazy ol TRX250 I have.
 

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Hey, lemme ride your bike
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Sell what won't do what you want and buy what will. KX125 (COUGH!)
 

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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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