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Discussion Starter · #1 ·
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?
 

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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
 

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I was going to say a 165 so guess i close try 0ne size ckeck plug and go fron there black color go down whitish go up you want a good tan color on the plug.
 

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Welcome to the forums.
 

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Discussion Starter · #6 ·
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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