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CB750 engine speeding up

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neat street:
Hi all
my F1 on standard setup has a small niggling start-up running problem which your thoughts would be appreciated on. when starting (with choke) starts and runs on first touch, take choke off and ride, after 15 mins or so, the engine speeds up from 1500, to 2500, reduce tick over adjustment screw, and all is great as normal, but when stored and restart, you have to readjust the tick over screw again to gain revs to 1500 and start the same process again?
any ideas please?
thanks
John

K2-K6:
Initial thoughts on chasing tickover inconsistency is air leak between carb and cylinder head.

Reason behind this is that uncontrolled air effectively bypasses your carburettors to which you respond by making adjustments.

Are you confident that the rubber and clamps are in good order? Worth a close inspection to spot anything obvious.

Also,  if you spray a small amount of carb cleaner onto the rubber carb mounts (don't do this inside a garage) if it changes by sucking that in and burning it then it would confirm a leak.

neat street:
Thanks for your reply, the carb rubbers and clamps are new and no signs of leaks.
thanks
John

K2-K6:
Ignition advance retard mechanism working freely / ok?

Minimum amount of slack available in "pull" throttle cable? The manual specifies this measured at the twistgrip.

neat street:
Thanks again, will check the throttle cable tomorrow, advance/retard freely working

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