Hi, I bought a JL50 as a lockdown project. Cannot get it to start! It has a good spark & new plug. Compression feels OK. Fuel tank was full of rust & water so thoroughly cleaned it out & new fuel. New fuel filter. New carb for good measure. It sometimes splutters for a sec or 2, but just wont start. Checked carb jets. Starter button doesn't work but solenoid & starter work ok by jumping the terminals; but I use kickstart anyway. Even a blast of cold start doesn't seem to help. Am I missing something?