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Thanks for your reply. Firstly the bike does not start easily when cold, secondly once on the road it runs and accelerates very smoothly, although lacks in power. However after running at say 120/130 km per hr it develops a miss fire and serious loss of power. The problem seems to be related to...

Greetings could someone please advise me what are the correct coils to use on my bike which is a 1981 CB750F, it has electronic ignition and has two TEC KP02 coils, however I get the idea these coils were fitted on Kawasaki's. Thanks, Bert.

You have given me a few things to check through on the carbs again, so let me do that and take the compression on each cylinder, then I will get back to you. Thanks anyway.

As I can recall, with new plugs goes like a bomb, just when you are thinking the problem is solved it loses power, you slow down and there you have a serious miss fire. At one time I would try closing the fuel tap, running awhile and then reopening it, but this did not always seem to work. Thanks.

Thanks for info. Cut off valve has been by passed. I also replaced what you call the awful rubber tipped float valve needles. When the bike is left standing with the fuel tap open fuel does not tap out of the float chamber drains so I seem to be lucky that fuel is not leaking through the float...

My 1981 CB750F develops a miss fire after riding for +- 20 minutes. I have removed and cleaned carbs a few times, new fuel filters etc, no improvement. Tried hotter and colder plugs no change. Plugs 3 and 4 always look as if they are running rick, ie black and sooty but not oily. Some have...