This is a .21 Hyper 8-Port Racing Engine with Rear Exhaust from Ofna
This engine is used to power 1/8 scale R/C kits.
*NOTE* Some kits require extra items to install and operate
this engine. Check kit requirements for these parts.
Oversized flow-through Gray anodized cylinder head
ABC construction (Aluminum piston with a Chromed Brass cylinder)
Ball bearing-supported crankshaft
Slide Valve Carburetor for greater response at the beginning and
end of the power band. This works well for on-road and racing
applications for fast take-offs and high speed.
Needle valve adjusted by a screwdriver
SG (Pilot) shaft
One .21 Ofna Hyper racing engine w/Slide Valve Carburetor and rear
One brass collet (these hold flywheel in place)
One running and parts information sheets
One Hyper .21 decal sheet
Displacement: 3.49cc (.21 cubic inches) Bore: 16.26mm Stroke: 16.8mm Horsepower: 2.7 @ 38000 RPM Weight: 350g (12.3oz) Carburetor opening: 15mm Length: 85mm (3.355") front of front bearing to back of pull start
120mm (4.72") pull start to end of crankshaft Width: 31mm (1.21") width neglecting the mounting flanges
21mm (.83") mounting holes same side
37mm (1.5") mounting holes opposite side Height: 113mm (4.428") from bottom of crankcase to top of cylinder head
16mm (.63") distance from bottom of mounting flanges to
bottom of crankcase
(contact Ofna for more technical information)
Fuel with 5%-30% Nitromethane (20% is recommended) and a lubricant
content of 16% or more
Muffler or tuned pipe w/manifold Glow plug: long without idle bar, can use O.S. Max #8 (OSMG2691)
– If you need more information, use these Ofna resources –
Tower Hobbies Has Been Serving Hobbyists Since 1971 • Call 800-637-6050 or 217-398-3636
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