Snowmobile Repair: Starts but dont run, float bowl, gas filter


Question
1978 Yahaha 440 Exciter. Replaced fuel lines, new carb float, gas filter&new boot from carb to manifold.Drained tank&had fuel pump checked out, replaced pulse hose to engine. Will start with spraying gas in carb,and then die, but the carb bowl is full of gas. Good spark. PLEEZ HELP!! THANX, Ryder

Answer
Have you checked your compression in the cylinder? It should be between 125 psi to 115 for a good start. Are all you adjustments correct on the carb.(air/fuel mix, and idle screw)? Is your throttle adjusted properly? Have you cleaned out all ports, passageways and jets in the carb. with cleaner and compressed air? If your getting gas to the float bowl then there is a problem between there and the cylinder.