Hey,

Same exact set up as mine. I run a 12x4 apc on 15% S&W and its a rippin fast airplane. My Magnum was so tight I used 1200 grit paper to hand fit the piston after 12 or 13 flights. I used to do this with K&Bs years ago and its a great way to fix a poor cylinder to piston fit but you need to pay attention and be carefull. You should have only the slightest pinch at TDC with a stone cold engine. Mine needed a stiff grip to turn it over cold after a dozen flights, way to tight, I bet .004 interference fit. Did you ever fly yours with the gear in the stock position? If you run the gear in the swept back position it noses over, with the gear backwards ( swept forward ) I would imagine it would have no problem what so ever, I just dont like the looks of the swept forward gear. I am still waiting for a fix from Great Planes. I better not hold my breath.

103/17