Originally Posted By Graham, G4FUJ
I wonder whether there was some icing in the throttle body?

I had an old mini (1275GT smile ) that used to suffer from that, with the same symptoms as Paul describes. In that case, some aluminium foil over the front grill fixed the problem. You don't see cars doing that these days. Might be hard to do on a 3 wheeler wink . Sticky throttle sounds like a different issue to the starting problem too