MOTOR OS .28XZ(P) TRUGGY ABC 21J 12830

This is the 2-stroke O.S. Max 28XZ Truggy Engine.

FEATURES:

• Designed for 1/8 scale truggy applications
• Aluminum crankcase, black in color
• Three needle 21J slide valve carburetor
• 8mm red carb insert for smaller tracks that restrict air intake and
• 9mm blue carb insert for higher RPM applications and larger tracks
• Six port piston sleeve ensures high power
• Ten fin blue anodized cooling head with inner head button

INCLUDES:

O.S. Max 28XZ Truggy Engine with instruction manual, P3 turbo glow plug, 8mm & 9mm carb inserts, extra copper head shim, exhaust gasket, dust cap set and instruction manual

REQUIRES:

• Fuel: 10-30% nitro content (20% for break-in)
• Air Filter: MSFG1660
• Exhaust system depending on vehicle, see COMMENTS
• Track equipment

SPECS:

• Displacement: 0.284 cu in (4.65cc)
• Output: 3.31ps/32,000 RPM
• Bore: 0.728" (18.5mm)
• Stroke: 0.681 cu in (17.3mm)
• Practical RPM Range: 4,000-38,000 RPM
• Weight: 13.2oz (375g)
• Distance between Mounting Holes Same Side: 0.83" (21mm)
• Distance between Mounting Holes Opposite Side: 1.4" (37mm)
• Length from Backplate to Drive Washer: 2.9" (73.3mm)
• Width of Mounting Flanges: 1.8" (45mm)
• Width of Crankcase Below Mounting Flanges: 1.2" (31.6mm)
• Distance from Crankcase Center to Drive Washer: 1.7" (43.9mm)
• Height/bottom of Mounting Flanges/top of Cylinder Head: 3.8" (95.9mm)
• Height/bottom of Crankcase/top of Cylinder Head: 4.4" (111.9mm)

Needle Settings:

• High Speed: 3 turns out from fully closed
• Metering Needle (low speed): Rotary: flush with carb body
• Slide: flush then 1/2 turn in
• Throttle Stop Screw: .5mm out from fully closed

COMMENTS:

The O.S. Max T-2060 WN Speed Tuned Pipe OSMG2939, OSMG2938 is an ideal exhaust system for the 28 XZ.
Flywheel sets are required (OSMG2648 for Mugen, OSMG2649 for Kyosho, both sold separately) for certain truggy models.

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.