SOHC.co.uk Forums > CB750

CB750 K3 - lack of power

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garyjpaterson:
Speedo cable is new, since the bike didn't come with one. And it does oscillate a little, but not much, about what I'd expect for this age. My CB350 is really wild, at speed it can swing around to quite the extreme! But tbh I'm not overly concerned about the speedo, just knowing its off and by how much is good enough for me for now.

Interestingly, cyl 4 compression is fine, at 150psi. But cyl 1 is a bit lower, at 130psi, yet that plug is in line with 2 and 3. I'll be testing compression on them all again once ive got more miles on it.
I'll probably end up with the carbs off again just to absolutely make sure the idle circuit is totally clear, floats are definitely correct etc

Spitfire:
When I rebuilt my 750F1 I followed my wife in the car through Liverpool and was gobsmacked at the speeds she was doing through the camera infested areas, so I did some testing using the car as a pace maker, at 30, 40, 50 and 60 mph.
 The result was the speedo on the Honda was 7 mph fast at all speeds, no wonder I was having problems with 30 mph speed limits, so since then I just deduct 7 mph from whatever it tells me.

Cheers

Dennis

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