I have one too, One thing I have learn is never take the pump apart to check it You may never get it going again, If it has been sitting for some time and can't get to run properly take the plug out and run alchol through it for some time to clear old fuel from the pump. and then try it again. I was told to take it apart and massage the diaphram lightly with pretrolium jelly and reassemble. But no luck it's factory ajusted and an attemp to service it could lead to no good results. before doing anything if it don't work get as much info you can or get it to someone who can realy get it going. I finaly got mine going but had to replace the pump , with a crank cover, but can no longer use it for what it was ment to do as placement of fuel tank anywhere. Otherwise it's a great motor. hope this helps if you can't get it going.

roltech