Did your nitro helicopter engine Red Line RL-53 H have damaged . In our store you will find helicopter's engines spare parts . Do you own a thundertiger rc helicopter engine and you can't find spare parts ? Stop seaching we have them all for your disposal . Pistons , cylinders , connecting rods , crankcase , crankshafts , o - rings - gasket set , needle valves , washers , carbulators , cylnder heads are only some of the rc engines spare parts tha we can provide you. Spare parts for the Red Line series Helicopter engines RL-53 H, RL- 56H .