Originally Posted by hansleopoldDid a test ride on my CB 450 K1(converted to CL now) yesterday, and found out that there is a flat spot around 1500-3000rpm. The engine hesitates, and you don`t get the desireable torque when riding away.
I`ve been messing around a lot trying to solve this problem, but nothing helps. The ignition is perfect (... Read with a strobe at both 1100 idle and at full advance it shows EXACT index alignments?)..., the mains are #130, pilot #38 and the float is as stated. Have read in the Clymer Manual that flat spots are due to fuel starvation at a specific rpm. Does it help to change to larger mains (... CL pipes are somewhat more restrictive than CB pipes, jetting changes are common....) ? Blocked air jets? (...IF you actually properly cleaned the carbs, this couldn't be an appropriate question..)
Anyone who has a clue on this subject...... Are the carbs correctly synchronised?........?????