ORIGINAL: bjor

Hi Royster. You will love the SPE 40. I ordered one off ebay a few weeks ago to put in a CMP Yak 54. The engine is great with the walbro carb set up. Mine started straight from the box with a 30:1 mix and have since changed to a 40:1 mix with great results. I ran about 2 litres through the engine on the ground before first flight. The initial maiden had the engine "popping" but it gets better and better every flight - just run it rich to start and lean out a bit each flight. I have a 4.8V 2500mah sub C pack on the ignition - works fine with plenty of flying time. Also - make sure the plug cap is fixed firmly on the plug. Mine kept falling off until some tight fisted bloke shoved it all the way on properly - hasn't fallen off since. The only problem - my standard side sounded muffler fell of in flight so now I'm waiting to order a new one. USE LOCK TIGHT as already suggested by grossy. I'm also changing to a Hitec 645MG servo for the elevator - don't want to rick the nylon gear ones. Best of all - $1.20 a litre to run. Now I can fly all day without having to folk out a fortune for nitro.