It's possible that some crud may have gotten into the engine.  I have not run it in a dusty environment until the past few weeks in the field behind my house.  I just don't understand because it still feels like a good pop in compression when cold and the cylinder and piston appear very smooth from the naked eye.  I was certain to line up the ports correctly when reinstalling.  It is very possible that I changed the direction of the piston.  Would that make a difference in GMS engines?  This one did not have any markings on the piston such as an arrow pointing towards the exhaust port.<div>
</div><div>Before I completely give up on it, I will extensively check for air leaks and try a fresh glow plug.  </div><div>
</div><div>By the way, as far as my original question of how to tune for 3d; I tuned the OS 46fx (os 8 plug; 15% powermaster) as I would for normal sport flying, maybe a click or two richer on the high speed than I would normally.  It ran flawlessly</div>