Hyperactive CGT

[Jim Haseltine]

My 83 CGT (KE engine) has been parked up for a few months. I've been running
the engine for 10-15 minutes every Sunday just in case I need to use it
again at short notice. This week it started fine, idled at its usual ~1k for
a few seconds then spun up to 4.5k and held there. It did that each time I
started it. I've checked the throttle cable, the throttle valves and the air
flow sensor plate, all of which appear to be operating correctly. I've tried
with the cold start valve disconnected but this made no difference. The only
other thing that I can think is that something in the metering head has
stuck.

Any ideas?

Regards,

Jim Haseltine