SOHC.co.uk Forums > CB750

CB750 engine speeding up

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Spitfire:
My F1 is fine, standard set up, jets, filter etc. To start, full choke, start up, set off, take choke off immediately and that's it, but it will not tick over cold though, you have to rev it.

Cheers

Dennis

Moorey:
Standard setup full choke when cold, when started 1/2 choke then within 1/4 to 1/2mile choke off. Ticks over fine

neat street:
thanks for our reply`s
I will continue with what I do at present, just thought here would be an easy fix. I do the same as Dennis.
thank you all again
john

K2-K6:
Compared to modern setup engines they are just very manual.

The very next model F2 K7 they put a choke cable on for ease of use,  along with different carbs that have a throttle lifting facility on operation of the choke.
These do the opposite to yours as the manual spec for "on choke" rpm is 2750 +/- 750 which alarms people as it sits there with elevated revs when cold. ;D

hairygit:

--- Quote from: neat street on September 05, 2019, 08:34:29 AM ---thanks for our reply`s
I will continue with what I do at present, just thought here would be an easy fix. I do the same as Dennis.
thank you all again
john

--- End quote ---
That's exactly how bikes were even brand new back in the day. No fast idle on choke, it is the rider that keeps control of the idle speed with the throttle until the motor is properly warm. Older bikes like these can seem very odd if you didn't ride them back in the day and have only ridden modern stuff. The brakes on these old Honda's were some of the best in their time, but younger riders used to modern brakes find them terrifying!

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