£50 is pretty cheap for a brand new 21 nitro engine.
I don`t mean to teach granma how to suck eggs n all but,
Don`t forget the 4 second rule if you are out on a big field(not the golf course surely?).
Ie,,, don`t hold full throttle on for more than 4 seconds or you run the risk of the engine siezing or going pop.
Also don`t run the motor to lean,always make sure there is some smoke from the zorst.
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