So, pa's Landy decided to throw a strop and not fire up earlier. I've just spent an hour on it, checking ignition wiring and fuelling. Found bad wiring between coil and dizzy - the wiring that we put in when we converted to electronic ignition was always a bit of a stop-gap as we didn't have any particularly high quality wire on hand, but once we had some we never quite got round to redoing it
Taken care of that now.
Following that, it still wasn't running but it would at least fire briefly. Pulled the inlet filter out of the carb (a Weber 36DCD of indeterminate origin), and it's covered in sediment. Clean that off, refit. Still no joy. Pull fuel line off carb, suck on it (
), suck on it harder (
), spit mouthful of gas and sedimentary gunge off to one side (
), refit fuel line. Now running, but bit crappy and threatening to stall. Let it warm up, then mucked around with the tuning on it for a bit and now it's running perfectly.
For my next trick I'll get rid of that Weber and the manky old fuel line to the pump, and fit a stock Zenith and new line and filter that we've got ready to go when we stop being lazy...