at lowest throttle plane moves forward
Hi!
Are you flying from grass or asfalt!
As for running in.......no engine takes several liters (1liter appr 0,2gallon) to run-in!!!
What rpm are you having at idle? and what prop?
For your 6,5cc(.42) engine in a highwinged trainer ...a 11x5.11x6 should be used if you fly at sea-level ...this gives more low speed trust and a more stable aircraft ,more plesant to fly for a novice......do not use a 10x6 prop!
Always use APC props...never Master Airscrew !!!
Regards!
Jan K
Sweden
27 years in this hobby!