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Hi guys,

Ever since I put an 2 into 1 exhaust on my 1980 cb400n, it lacks a bit of power in 5th and 6th gear.
So I was wondering if any one of you solved a similar issue with putting bigger needles in the carbs and what size.
The air filter remained stock.
Greetings from Belgium and thanks for your tips!!

Tire Wheel Fuel tank Automotive fuel system Vehicle
 

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Any signs of a misfire or "surging" ?

Probably not as the engine would tend to do this in every gear...

Have you noticed that on wide throttle openings it lacks some power, bit if throttle closed a bit, power seems to come back a bit ?

Power seems to be good over 6 k rpm where it becomes a "different animal " ?
 
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