1.The engines don't come with a glowplug so you'll have to provide your own with the .52 and here's a useful tip... Don't use a brand new glowplug to break in a brand new engine.
2.is to leave out the blue paper gasket that is designed to fit between the muffler and the engine's exhaust stack. The machine-finish of these two surfaces is more than good enough to prevent leakage and because the gaskets tend to compress over time they can often result in loose muffler screws and even a lost muffler if you're not careful.
3. it is a glow/nitro engine A POWERHOUSE 40-CLASS ENGINE?The crankshaft is steel with the usual diameter (for a .40-class engine) and appears to be well made.
4. prop: 11x6, 11x7, 12x6, 12x7, 13x6
Description
KT Force power 52F Two Stroke Glow Engine For RC AirPlane Aircraft Plane