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User Reviews
New Products
Airplanes
Boats & Subs
Cars & Trucks
Engines & Motors
Helicopters
Transmitters
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MOTOR PROFILE:
FR7-420 Sirius
Specs
Ratings
General
Manufacturer:
O.S. Engines
Engine Type:
4-Stroke
Cylinders:
7
Dimensional Specifications
Displacement:
4.250 cubic inches
Low RPM:
1500
High RPM:
7000
Bore:
0.945 inches
Stroke in:
0.866 inches
Shaft:
Threaded
Weight (no muffler):
111.70 oz.
Applications
- Giant
- Scale
Street Price:
$3499.99
Overall Rating:
Composite Member Review Scores
(1 Reviews)
Reliability:
Power:
Maintenance:
Value:
Parts:
Durability:
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