I got a used AP .15 engine just a little while ago but am having some difficulties starting it. I can get it to start for about 5 or 10 seconds just kind of putting, but cant get any throttle response. After it stops putting for the 5-10 seconds, i can't get it to do it again. I take a break, recharge my glow starter until my voltmeter reads 1.45 and it does the same putt-putt thing. After my unsuccessful attempts, the glow starter is down to about 1.3 volts. My guess is that my glow plug isnt getting hot enough. What could be some other problems/ solutions for starting this engine? What is the fuel adjustment knob supposed to be at? My guess was 2.5 turns but i really tried all over the place. I read about starting with some D batteries? Think that would work? The engine in somewhat difficult to turn over but i dont think that should be a very big problem. Could it be the cold up here in the northeast? Any ideas? Thanks