What about stock rim sizes with road orientated tyres (ie not knobblies)? Still 30ish?

That's really helpful to hear - cheers. I've found 1 1/8 good for the pilot screw good too.

I'm running premix for the time being with an opened up airbox, air filter which is currently unoiled (should I oil it?) and DEP pipe. I can richen the pilot mixture to my satisfaction (1 turn out seems rich enough without bogging badly), but I don't want to run lean in the powerband. Following the ...

Silly question answered elsewhere I'm sure, but Mk2 air screw default setting is 1 1/4 turns out. Does turning it in from there richen or lean the mixture? Thanks! I'm never sure if I'm dealing with a restriction in the air or the fuel, which have the opposite effects.

It's just a small metal contact on the end of the selector drum. If it gets gummed up, or the spring in the switch goes, then bye-bye neutral light. It's an engine strip (including splitting crankcases) to fix. No idea why it would only show after starting and then never again.

Are 17x4.00 the biggest rims you can get away with for the rear wheel? There seem a lot of 4.50 and 5.00 rims on eBay.

ouch twice in one day I should have checked the FAQ - D'Oh!