I need some help with my new broken in FL70. I broke the engine in following the instructions perfectly. In fact I am up to 4 tanks of fuel and today was going to be the first real flight. Untill today I had no problems at all and had even decided that I just loved the enigine. BUT today I could not get the engine to run past idle. It would run at idle but if I brought the throttle up at all it would backfire and stop. No matter what I set the main needle valve it would backfire I tried for over two hours... it would just backfire ALLOT and stop. So I packed it up for the day.

It has run perfectly until now again it only has 4 tanks through it and have been very careful! I have to wonder if this engine is any good? Can it be repaired? Do the valves need to be adjusted already?

Any help would be great!!!!

Thanks!