Couldn't get it to start and because it had been running from a rusty tank, I figured fuel first. I put a repair kit into the fuel pump, blew out all the lines, then disassembled and cleaned the carb. As of now, it will start (only with no choke, but on two cylinders) but misses badly, won't tick over, and seems to be running very rich. I can't experiment more yet, 'cos there was no water and I'm waiting for an impellor. Compression is 95 in the top, 90 in the lower. In the meantime, I looked at the electrics and according to the book, I should be able to make a 1/2" spark at the plug end - I can only manage 1/4". Is this within acceptable boundaries?
I didn't use a repair kit on the carb and given some good pressure buildup with the fuel line bulb, it leaks fuel from 101 in the diagram below.
101 is connected via the gasket to 100, the 'J' shaped tube. Does this mean that the rubber-tipped fuel inlet needle isn't seating properly?
Any pointers gratefully taken, thanks in advance.
I didn't use a repair kit on the carb and given some good pressure buildup with the fuel line bulb, it leaks fuel from 101 in the diagram below.

101 is connected via the gasket to 100, the 'J' shaped tube. Does this mean that the rubber-tipped fuel inlet needle isn't seating properly?
Any pointers gratefully taken, thanks in advance.