Ofna E2801 Force 28 SG w/Pull Start

Tower Stock# LXTUL9  •  Manufacturer Stock# 52217
Ofna E2801 Force 28 SG w/Pull Start (large view)
Notes from our tech department:
This is the Force 28 Truggy Engine with Pull Starter from Ofna.

FEATURES

ABC cylinder liner construction "A"luminum piston with a "B"rass
cylinder liner that is "C"hrome plated
Slide valve carburetor
SG "pilot" type crankshaft
Rear exhaust

INCLUDES

Force 28 Truggy Engine with Pull Starter, tapered drive washer,
silicone exhaust basket, instructions and parts list

REQUIREMENTS

Fuel: Car blend with 20% nitro
Glow Plug: Medium heat range without idle bar
Misc. field equipment, air filter, plug wrench and more

SPECIFICATIONS

Displacement: .28 cu in (4.58 cc)
Bore: 18.68mm
Stroke: 16mm
Output: 2.9 PS @ 32,000RPM
Practical RPM Range: 2,500 - 32,000
Weight: 16.7oz (475g)
Distance between mounting hole centers/same side: 0.83" (21mm)
Distance between mounting hole centers/opposite side: 1.4" (37mm)
Height/bottom of mounting tab to top of cylinder head: 4" (102mm)
Height/bottom of crankcase to top of cylinder head: 4.5" (115mm)
Width at mounting tabs: 1.8" (45.8mm)
Length from pull starter to front bearing: 3.3" (84.2mm)
Length from pull starter to end of crankshaft: 4.5" (114mm)

Carb needle settings;
Main Needle Valve: 3-3-1/2 turns form closed
Low Speed Needle: Located in the center side of carb, set flush
with ball end
Barrel Stop Screw: Set for 1/16" inch gap

COMMENTS

Some notes on rotary and slide valve carburetors;
Rotary carbs offer a larger response in the middle of the power
band. This works well for off-road applications when throttle
response must be varied.
Slide Valve carbs provide 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.

jxs 3/13/08
ir/jxs

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