I've had a H9 "Alpha" trainer for a few weeks now, and as said in the post above, mine fired off and ran like a champ with no fiddlein' of the settings..... and up to this week have had no trouble at all. This week however it developed a "stagger" during transition from idle to open throttle, and seemed a little balky during flight. I tried to lean it out a bit, and it wouldn't transition at all. Died as soon as the throttle was cracked.

Changed the glow plug to an OS#5, and brought new life to the engine. Flys stronger, runs & idles smoother. My engine is leaned out about 2 clicks past the stop. BTW, I broke the 3 blade prop and now swing an 11/5 two blader.....

As a beginner, I like the engine....

Allen