my first post here, my 1974 vespa will idle sometimes, but will cut out when it gets hot. I have fushed out the gas tank twice, cleaned the carb twice. it"s getting gas. is it possible it"s losing spark at lower rpm"s? I put in a new ngk plug last night and it ran for 10 min. ok didn't stall, but I don"t think that cured it. how do I get to the points? looks like it"s behind the clutch to pull the flywheel.