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Discussion Starter · #1 ·
I have an 04 CRF 50. I have put a uni airfilter, rev box, DPM valve cap breather and fast 50s pipe on it. Has helped top end a lot but bottom end sucks. Whats up? I was out riding yesterday and my buddies 50 that is bone stock can get me off the line everytime. Where did I go wrong. Or what do I need to do to fix it without doing a big bore kit?
 

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50s pipe on it. Has helped top end a lot but bottom end sucks. Whats up? I was out riding yesterday and my buddies 50 that is bone stock can get me off the line everytime. Where did I go wrong. Or what do I need to do to fix it without doing a big bore kit?




well first off make sure that you didnt buy the fast50s "BIG BORE" version pipe...doing so will clarify your not an idiot :D



next...many peoples carb has to be tuned after UniFilter/PIpe Installed...



and to help you out with that....



http://www.ministothemax.com/hop_ups_carb_tuning.htm













-binH
 

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yea when i put a differnt cdi on mine its a kitaco it had less bottom end i think they change it to all top just try the stock cdi and see whut happens
 

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The Kitaco CDI will show no gain or loss on a stock motor. It's the exhaust pipe, and the air filter.



A better exhaust will flow more freely, and will cause you to lose more low-end torque unless you have the motor set up properly to support the pipe.
 

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Discussion Starter · #8 ·
Its not a big bore pipe. It is for the 50cc motor not 88cc. This is not my first 50. I had and 03 with the same pipe and didnt have this problem. But it didnt have the rev box or airfilter.
 

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check your valve clearence!!!

Make sure your filter is throughly oiled properly

If you plan on keeping it stock for a little while, you can do a simple port job and it will increase your bottom and mid.

my 2 cents

Later
 
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