Geoff,
Played with them yesterday. Unscrewed the throttle stop screws and screwed in the volume control and have got it down to 1,000 rpm and firing evenly.
On closing the throttle it drops to 1,500 holds and then drops down to 1,000. I assume there is a damper in the carb. I can't go below because when the clutch is depressed engine speed drops by 300 rpm and at lower tick over speeds the engine stalls.
The real pain is finding where the battery drain is. Cables that disapear into harness' bear little relation to wiring diagrams! Especially when the electrician used generic cable colours, not that it is easy to identify what the wire colours are on the diagram in the first case.
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