RE: Improper break-in
There is no visible scar in either the piston or the cylinder. I wasnt the one performing the break in. I recently ordered two kits, one for me and one for my brother. He was the one who screwed up the break in. He started the engine and then screwed the needle until he got the highest rpms he could then he ran full throttle for about 30sec followed y 30 sec of idle repeatedly until it ran out of nitro. Luckily the fuel lines where mislabeled so he had the refill line plugged into the carburetor which helped as the engine died several times within the process as a result of faulty nitro intake, which gave the engine time to cool down. It was not flying, it was sitting on the ground. I suppose he turned the needle 1 1/2 to get it started and then tuned it into max rpm. There was indeed lots oif oil coming out of the muffler as the side of the plane was totaly covered in burnt castor oil. How can I determine if the engine is OK or if its damaged?