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Discussion Starter · #1 ·
so im doing some work on a buddy’s 400ex. wasn't running right so i cleaned carb and put new gas and still had the same issue of bogging past half throttle so i threw a 155 and a 40 in there and done adjustments from 1 turn to 3 turns out and still would bog. any suggestions? Bike is bone stock
 

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Bog past half throttle could be clogged exhaust, bad cam not opening the exhaust valve long enough or it might be a carb or intake issue.

Pilot jet and fuel screw is for idle only and has no bearing on a bog past 1/4 throttle.

How was it running before cleaning the carb - not running right might be simply a bad spark plug issue.
 
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