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Mills1310

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About Mills1310

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    TT Newbie

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    North Dakota
  1. Mills1310

    Any sugestions on jetting my 04 KFX400

    Hey everyone, I was wondering if anyone in my area would have suggestions on jetting my 04 KFX400 with a Yoshimura comp RS-3 slip-on and open air box with K&N power flow kit intalled. I live and ride at about 1400 feet above sea level. Any ideas?
  2. Hi there I just rejetted my 04 KFX400 and have seen a loss of power. And I'm not sure why. I started the whole process by removing my air box lid and replacing it with a K&N air box lid cover and pro flow K&N air filter kit. I also at that time changed my main jet from a 135 to a 160 main jet. I noticed a power increase, but the quad would back fire on deceleration which I believe indicated that the unit is running to rich. From there I intalled a new Yoshimura RS-3 comp. slip-on pipe and also noticed a little increase in power, but the unit was still back firing in deceleration. I then proceeded to change the main jet to a 155. I took my quad out for a ride and I lost alot of mid range power. The bike did start and Idel better, but the power is just not there. Any suggestions on what jetting I should be at. Should I go down to a 152.5 like the yoshimura specs suggest? I live in Bismarck, ND at and ride at about 1300 ft. above sea level.
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