This is the Magnum XL70 RFS Four-Stroke Aircraft Engine
with Blue Rocker Cover.
FEATURES: 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
INCLUDES: Magnum XL70 RFS Four-Stroke Engine with Muffler, instruction manual
and parts list
REQUIRES: 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: 13x6
Glow starter, fuel tubing and field equipment
SPECS: Displacement: 0.70 cu in (11.5cc)
Bore: 1.01" (25.8mm)
Stroke: 0.87" (22mm)
Practical RPM: 1,800 - 11,000
Weight with Muffler: 21.2 oz (601g)
Distance Between Mounting Holes Same Side: 0.87" (22mm)
Distance Between Mounting Holes Opposite Side: 1.9" (49mm)
Width at Mounting Tabs: 2.2" (57mm)
Height from Bottom of Mounting Tabs to Rocker Cover: 3.8" (97mm)
Height from Bottom of Crankcase to Rocker Cover: 4.6" (116mm)
Distance from Backplate to Front Bearing: 2.9" (73mm)
Distance from Backplate to end of Crankshaft: 4.8" (122mm)
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
COMMENTS: 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.