Glow Plugs, if your engine is an older K&B engine you may need a plug with an Idle Bar!!! remove the muffler and look in the exhaust port, if you see 4 or 5 little square ports in the cylinder Liner you need an Idle Bar plug, if the Liner has a wide port you need a Mid Range standard plug like an OS 8.

I don't know much about tuning K&B carbs, but if it has an old Air Bleed carb you need to screw the Idle Needle "in" to Richen the Idle, and turn the screw out to lean the idle.
they are good engines. check the glow plug after it stalls, if it's really dry it may be too lean.

also, if it's 65 and you have a 9 inch prop on it that could be your problem, a longer prop will give more "flywheel affect", so try putting a 12x5, 12x6, 11x8 on it.

in my link you can find K&B manuals. maybe you can find your engine.
http://www.mecoa.com/kb/aero/aircraft.htm

Jim