I have an fg 20 so far it has been total frustration.sent it back to horizen.Got it back with a note saying the pin which holds the timing hub in place was sheared off which they fixed.Also said they ran the engine up to full power with good transition and idle .When i set the engine up on my test stand to run it it would hardly run.After extensive carb adjustments i finally got it to run with marginal results.It will not hold a consistant idle surges up and down.I have tried every conceivable carb setting imaginable and it will not run reliably.I am a lifetime modeler with over 50 yrs experience with engines both glow and ignition.So i feel i know what i am talking about.I think i may have a defective carb.
Will try sending it back to horizon again hoping they will resolve the problem.If they don,t then my opinion of this engine is it is a piece of crap.I have an fg-36 that runs great no problems at all. Anybody with fg 20 experience please reply.