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2007 Honda 400EX Aftermarket Combination?


kaptainbutler
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I have a FMF Powerbomb Header, FMF Powercore 4 Exhaust, K&N Filter and a Dyno Jet kit. Powerecore has a decent dent in the side from a wreck, but I dont think it is affecting the inner flow, the cylinder inside seems to be just fine. However, Im getting spanked everywhere except a little on the low end. I even had a factory get me the other day on a straight away race. The only thing he had done was remove the baffling. I thought I had a pretty good combination, what am I dont wrong. i am at a wall and can not get it tuned in. Thanks ahead for any suggestions.

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Dream Car Giveaway

Three things could be a factor here. One, riding style, if someone is getting a better launch and is shifting at a more optimal RPM, he can win in a race against a more powerful machine. Two, rider weight, a heavier rider means more weight that the motor has to move, I think that one explains itself. Third, your machine may not be tuned correctly, you may need to make some tuning adjustments like jetting, vavles, are you running an old plug?

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No, you would not be wasting your time, jetting off a chart is not the best way to go about it. Besides, you need to take the intake changes into consideration too. A pilot jet change may be in order, or maybe just an adjustment to the pilot screw. Learn to read your plug, it is your best indicator for jetting besides engine performance. I could sit here all day and try to explain to you how to properly jet your machine, but I think you would do better to just use your search engine to do some research. Look up "plug chop" and just try to find as much info on jetting as possible and read up on it.

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