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Ofna - OFNG5220 OFN52205 52205 023705522059 0023705522059
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Ofna JL .28 Max
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Ofna JL .28 Max
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Tech Notes
This is the JL .28 Maxx Engine with Pullstarter from Ofna.


Slide valve carburetor
Ten fin heatsink head, black in color


JL .28 Maxx Engine with Pullstarter and Instructions


Fuel: Car blend, 20% recommended for break-in
Glow Plug: Hot or medium range
Air filter depending on vehicle
Glow starter and track equipment


Displacement: .28 cu in (4.6cc)
Stroke: 0.66" (16.8mm)
Bore: 0.75" (19mm)
RPM: 38,000
Horsepower: 2.7
Weight: 11.6oz (330g)
Height Crankcase Bottom/to Top of Cylinder Head: 4.5" (115mm)
Cylinder Head Diameter: 2.4" (60mm)
Length/Mounting Hole Centers Same Side: 0.87" (22mm)
Length/Mounting Hole Centers Opposite Side: 1.5" (38.3mm)
Length/Pull Starter to end of Crankshaft: 4" (102mm)
Carburetor Settings-
Main Needle Valve, 3-3-1/2 turns from closed, adjust for maximum
RPM and power without making engine too lean or too hot
Low Speed Needle: 4-3/4 turns from closed, do not adjust until main
needle valve is set for power and top speed
Barrel Stop Screw: Adjusts idle, set for 1/16" gap to start new
engines, open more for faster or higher idle

jxs 09/09/13

– If you need more information, use these Ofna resources –
Email: help@ofna.com
Web Site: http://www.ofna.com/
Phone: 949-586-2910
  Postal Address:
IRVINE, CA 92618

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Accessories Needed
This is the JL .28 Maxx Engine with Pullstarter from Ofna. FEATURES: Slide valve carburetor, ten fin heatsink head, round rear exhaust REQUIRES: 20% car blend fuel, glow starter, air filter, filter oil, fuel bottle

Accessories for the Ofna JL .28 Max

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 LXRXC9 Tower Hobbies TOWER Power 20% Car Fuel Quart
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10.69   In Stock
Subtotal for this Group of Accessories: 10.69  

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