Enya 09 Standard R/C Engine with SilenserEnya 09 Standard R C Engine not run in box with instructions as new Enya . 09 is strong, easy to start, virtually indestructible. Enya only recommend 5% nitro and with a cast iron piston, high castor is essential. 7X4 should be about rightprop, but stick a 7X3 on it & you won't believe the difference, assuming it's broken in. Shouldn't have any problem pulling Use a hot plug. Long will work well but the original Recommend an Enya plug, is about