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Magnum - MGMG2915 MGM210868 210868 032227029885 0032227029885
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Magnum XL91 RFS Blue 4-Stroke
Magnum XL91 RFS Blue 4-Stroke
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Mid Jun

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Tech Notes
This is the Magnum XL91 RFS Four-Stroke Aircraft Engine
with Blue Rocker Cover.


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
High-flow muffler
One year limited warranty through manufacturer


Magnum XL91 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 "hot" type
Break-in Propeller: 14x6
Glow starter, fuel tubing and field equipment


Displacement: 0.91 cu in (15cc)
Bore: 1.09" (27.7mm)
Stroke: 0.97" (24.8mm)
Crankshaft Diameter: 5/16"
Practical RPM: 2,000 - 12,000
Weight with Muffler: 22.4 oz (635g)
without Muffler: 20.7oz (587g)
Distance Between Mounting Holes Same Side: 1.02" (26mm)
Distance Between Mounting Holes Opposite Side: 2.04" (52mm)
Width at Mounting Tabs: 2.4" (60mm)
Height from Bottom of Mounting Tabs to Rocker Cover: 4" (101mm)
Height from Bottom of Crankcase to Rocker Cover: 4.7" (120mm)
Distance from Backplate to Front Bearing: 2.9" (74mm)
Distance from Backplate to end of Crankshaft: 4.9" (125mm)

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 4-1/4 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.

jxs 7/02/09

– If you need more information, use these Magnum resources –
Email: service@globalhobby.net
Web Site: http://globalservices.globalhobby.com/
Phone: 714-964-0827
  Postal Address:

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Accessories Needed
This is the Magnum XL91 RFS Four-Stroke Aircraft Engine w/Blue Rocker Cover. FEATURES: Dual ball bearing supported crankshaft & camshaft, dual needle rear mount carb, dual bushing con rod, high-flow quiet muffler REQUIRES: 10% 2-stroke fuel for break-in, 15% 4-stroke fuel for normal running, glow plug, prop, glow starter & field equipment

Accessories for the Magnum XL91 RFS Blue 4-Stroke

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Low Price
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Qty Discount Available
2.69   In Stock
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Qty Discount Available
2.99   In Stock
 LXK134 Great Planes Ultra Precision Fuel Filter
Qty Discount Available
3.79   In Stock
 LXUM80 Duratrax Glow Starter C Battery
Qty Discount Available
7.99   In Stock
Limited Quantities
 LXCB28 O.S. Type F Glow Plug Medium Four Stroke
Qty Discount Available
8.99   In Stock
 LXHY36 Top Flite 14x6 Power Point Propeller
Qty Discount Available
6.49   In Stock
 LXRXC4 Tower Hobbies TOWER Power 10% Airplane Fuel Quart
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8.29   In Stock
Subtotal for this Group of Accessories: 41.23  
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