Aluminum piston, iron piston ring and steel cylinder sleeve for long
life and high power output
Dual ball bearing supported crankshaft and camshaft
Dual needle valve carburetor insures precise fuel/airflow metering
One year limited warranty through manufacturer (valid only for
engines purchased and used in the United States and its possesions
Magnum XL52 RFS Four-Stroke Engine with Muffler, instruction manual
and parts list
Fuel: For break-in, 10% 2-stroke airplane blend
For normal use, 15% 4-stroke airplane blend
Glow Plug: 4-stroke type
Break-in Propeller: 12x5, after break-in 11x7-8-9, 12x5-6-7, 13x4
Glow starter, fuel tubing and field equipment
Displacement: 0.52 cu in (8.53cc)
Bore: 0.90" (23mm)
Stroke: 0.83" (21mm)
Practical RPM: 2,000 - 10,500
Weight with Muffler: 15.7 oz (445g)
Distance Between Mounting Holes Same Side: 0.69" (17.5mm)
Distance Between Mounting Holes Opposite Side: 1.7" (44mm)
Width at Mounting Tabs: 2" (50.9mm)
Height from Bottom of Mounting Tabs to Rocker Cover: 3.2" (82mm)
Height from Bottom of Crankcase to Rocker Cover: 3.8" (96mm)
Distance from Backplate to Front Bearing: 2.7" (68.7mm)
Distance from Backplate to end of Crankshaft: 4.3" (109mm)
High Speed Needle: Turn in completely then back out 2-1/2 turns
Low Speed Needle: Do NOT adjust until engine is broken in. Hold carb
barrel open, turn needle screw counter-clockwise until it stops
then turn in clockwise 4 turns-this is the factory setting
Some Differences Between 4-Stroke and 2-Stroke Engines;
4-strokes are quieter.
4-strokes get better fuel economy.
2-strokes generate more RPM.
4-strokes generate more torque and will swing a larger prop.
4-strokes have a realistic sound, like a real aircraft engine.