A 170 cdi newbie here with a couple of questions. I purchased the 170 cdi off of ebay, a Hong Kong hobby shop with very good feedback.
I have the engine on my plane a Fliton Element 170. I had it at the field on Saturday to do the first run and to set the needles. I have read and reread Troy Newmans articles on the glow 170 version and the cdi 170 version and I'm aware of the relationship between the regulator and the hs needle. I had trouble getting the engine to run right, it had a good idle 2100 rpm, it would not drop off in rpm or surge so I felt like the regulator was set very close. The hs needle was initilly set to 2 turns out. I would slowly advance the throttle and it would start to stumble (miss) at 1/2 throttle. Finally after many adjustments leaning the hs needle I got it so that would take throttle without a miss. On the finalle run at full throtthe the engine suddenly shut down without warning. I thought the engine had siezed but it still turned freely. I was tired and bummed by now so packed up and went home and reread the owners manual and Troy Newmans articles again. Today I checked the spark plug gap its .015 and the valve clearance both are .002. I strap the airplane down on a table and point into the wind and start it up. I let it warm up and advance the throttle slowly to full and no stumble. Back to idle and its good at 2000 to 2100 and then advance again briefly to full again it is good no problems now back to idle for a couple of seconds and shut the engine down. Five or so minutes later I crank it up it idles fine, I advance the throttle and this time I have a major miss starting at half throttle so I shut the engine down and let it cool off for about 35 minutes. I restart and its ok except 1 small stumble. Is the engine over heating causing my problems (I think this is whats happening) or is there a problem with the motor? The hs needle is now at11/4 out and the regulator is flush at the 4/10 oclock posistion. Fuel is Curtis Youngblood 30% heli with an APC 19/11 prop. The field elevation here is 3300 asl.
Thanks
Mark