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Discussion Starter · #1 ·
I just installed a stage 1 cam in a otherwise stock 03 400ex and on initial start I ran it at the recommended break in rpm and the headers started glowing after a short ride I’m assuming I need a rejet but I’m not sure what to put in any advice would be greatly appreciated
 

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You assume wrong - installing a stage one cam does not require rejetting - did you make any other changes to the air box or air filter? Just installing a K&N filter will affect the jetting where as changing the cam does not. Jetting is dependent on the flow characteristics of carb on the engine it on. The flow is not changed by changing the cam - the cam controls valve lift, duration and overlap - you are still putting the same volume of air into the cylinder.
 
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