i have a 2005 400ex with dg exhaust and i just bought a k&n air filter and the k&n powerlid which came with the main jets.... not sure which main jet would be right for me i ride in indiana and at silver lake michigan.... any suggestions?
Welcome to the forums. if you go to Dynojets website and look up the jet kit for your 400 and open the PDF instructions you will see what is recomended I would say 170 main and a 1/2 turn out on the air screw
thanks for all the sugestions.... i ended up installing the filter and powerlid yesterday and took it out to see how it rode... it started up cold much easier than before and right away i noticed a huge difference in throttle response and low end power and no bog what so ever... never had it run soo good... didnt change the jet since when i bought it, it had no airbox lid and the dg exhaust soo im thinkin it has a 170 main in it already
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