QuestionHello Bill,
I am the proud owner of a 1975 CB360T. The bike has 12,000 miles on it and is in good shape. The summer after I bought the bike I rebuilt the carb. The previous owner told me that although he rode the bike a decent amount it always ran rich on one side and he could only get about 60 mph out of it, which I know is well below where the bike should be performing. After getting inside the carb, it became clear that the problem had to be elsewhere. I know the timing and air/fuel interaction on these bikes is notoriously difficult to get perfect, so I'm wondering what your experience tells you as to why the motor would consistently run rich on one side. Also, because I want the bike to be my daily ride eventually, I am considering a dyna ignition system. I am curious as to how difficult the installation and tuning is. Thanks a lot
AnswerJames, the ignition timing has to be absolutely correct on both sides, but at idle and full advance, to create ideal conditions for the fuel metering systems.
The carbs have to be matched, synchronized and clean in each and every circuit. Plus the carb diaphragms have to be free of any pinholes or tears.
Any intake modifications, exhaust changes, exhaust or intake manifold leaks can throw off the calibration of the metered fuel, at each stage of the carburation process. Make sure that the float levels are matched, all internal O-rings are intact and of course, both cylinders have to read out about 175psi in compression.
A Dyna ignition will stabilize the ignition timing on both cylinders, eliminating the need for maintenance of the ignition system. The Dyna systems have easy to read installation instructions. Electronic ignitions will allow easier starting, better throttle response and better overall performance.
Bill Silver
