• CNC construction low profile cylinder head, anodized red in color.:
• Fixed type two-needle carburetor with two mounting bolts, push/pul throttle lever and heat insulator for consistent performance unde different flying conditions and cowl enclosures.:
• Lightened hypereutectic machined Al-Si ringed type piston.:
• XC2 (extreme composite) cylinder liner coating with a criss-cros pattern etched on the sleeve wall.:
• Knife-edged high-strength connecting rod with bushings.:
• Redline R3 glowplug with platinum alloy filament.:
• Reinforced resin rear cage ball bearing support.:
• Three year limited warranty through Hobby Services beginning at dat of purchase.:

• Displacement: 0.529 cu in (8.27 cc):
• Bore: 0.886 (22.5mm):
• Stroke: 0.858 (21.8mm):
• Practical RPM: 2,000 - 21,000:
• Output: 2.1 BHP/17,000 RPM:
• Weight: 13.40oz (380g):
• Carburetor Settings:
• Needle Valve: Three turns from closed position:
• Mixture Metering Screw: 1/12 - 1/8 turn counter-clockwise:
• Distance/top of cylinder head-bottom of mounting tabs: 3.1 (80mm) Distance/top of cylinder head-bottom of crankcase: 3.5 (88.5mm) Distance between mounting holes same side: 0.71 (18mm) Distance between mounting holes opposite side: 1.7 (44mm) Cylinder head width: 1.7 (44mm) Width at mounting tabs: 2.05 (52mm) Width of crankcase below mounting tabs: 1.38 (35mm) Center of engine to front bearing: 2.04 (51.7mm) Backplate to front bearing: 3 (76.2mm) Crankshaft size: 1/4-28 UNF:

RL-53H Helicopter Engine with Redline R3 Glowplug, 2.5 & 3mm hex wrenches, two head shims, box wrench and instruction manual