Hi everyone, my 1984 , 2 1/4 petrol , Weber carbed, lightweight can take ages to start. It needs no choke , otherwise floods straight away and just the smallest amount of throttle.I have cleaned the carb, blown air through all the ports, cleaned the points and plugs and have a good spark. It's a 24v so turns the engine over at speed , the petrol is 95 and new with a new fuel tank. I'm at a loss, any ideas?