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Mk1 idle when warm



Hi.
I have just checked the valve, clearance, ignition timing, put on new
wires/cap/rotor.

When the motor is cold, the idle is at 1100 rpm and solid and smooth.
As the motor warms, the idle drops to 850 and becomes rougher.

The spark plugs are new and all showed  white and clean.
I was expecting a slight tan color.

What should I check for next?

Thanks
Ed