Hi armody, I hope you enjoy your ASP .52A 2-stroke and get many years of excellent service from it. I've owned and flown the very, very similar Magnum XLS .52A 2-stroke; both engines are manufactured by Sanye.

You might get the engine to break in more quickly on a slightly lighter prop, say an 11x6 instead of an 11x7. Letting the engine rev up and unload during break-in should help it stay cool. You should be able to switch to your 11x7 or 11x8 props after just a couple of initial tanks of fuel.

Which plug will work best will depend on your fuel to some degree. My XLS .52A ran great on fuel with as little as 5% nitro. A hotter plug will likely work better with 5% or 10% nitro, while a medium heat plug like the O.S. No. 8 may work better with 15% nitro fuel. I'm a big fan of Fox glow plugs, and I generally start with Fox R/C Long plugs for my two strokes (medium-hot w/ idle bar) while I use the Fox Miracle plug in most of my 4-strokes.

Hopefully you'll receive a proper owner's manual with your order. You can read the Magnum owner's manual here:

http://www.hobbypeople.net/index.php...aitfile_id/45/

The BH Models ARFs generally have a very good reputation for quality and flying characteristics. I'm sure you'll like the Sukhoi SU-31 ARF you're considering if you decide to go ahead and purchase one.

Good luck, and good shopping!