I recently got a P40 with a 73" wing span. It is suposed to have a 1.40 4c glow engine. I want to go petro to reduce fuel cost. What size 2cycle petro engine do I need for good power and flight without cutting away the cal. I have also considered a y engine like a SATO 200Ti 4c glow, or a single cylender ZDZ super 80petro. Is this the correct idea. It also has the engine mounted to a deck instead of the fire wall. Is this a show stopper for the firewall mount engines? should I go glow or petro? Any ideas on this would be appreciated greatly. oh ya, the plain kit says its waight is 10.5 lbs.