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Anyone use a boost bottle on 02800xc last year? Notice any improvement(performance,fuel mileage,etc.)?
 

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I tried one out on my 02 xc 800 I didn't notice any difference. I spent alot of time trying to get my pilot circuit right and ended up getting frustrated and took the boost bottle off. I never really got the sled right with it on that's why I probably didn't notice a diference. If you can dial it in right I'm sure it would help throttle response and fuel mileage.
 

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A boost bottle helps equalize and balance intake pressures.  As to whether a boost bottle helps with power or fuel economy, I think you will get a different answer from each person you ask.

As for problems with the pilot circuit; I have installed 1.0 long pilot air jets and the idle hang has virtually gone away.
 
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