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O.S. - OSMG2074 OSM12830 12830 531028017856 4531028017856
Manufacturer Stock#
12830
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O.S. 28XZ Truggy ABC w/21J Slide Carb
 
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O.S. 28XZ Truggy ABC w/21J Slide Carb
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Instruction Manuals: Manual 1 (2.4 MB)
Tower Catalog Page: 202

Stock Number
LXNYP3
Retail Price
549.99
Tower's Low Price
$329.97
Stock Status
In Stock
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Tech Notes
 
NOTES FROM OUR TECH DEPARTMENT
This is the 2-stroke O.S. Max 28XZ Truggy Engine.

****** Because of the expressed racing nature of this engine, ******
****** it is NOT covered by the O.S. 2 Year Warranty ******
****** per page 8 of manual ******

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

REQUIREMENTS

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

SPECIFICATIONS

Displacement: 0.284 cu in (4.65cc)
Output: 3.31 PS, 3.26 HP/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.

jxs 7/06/07
tlw 9/06/07
ir/jxs
updt lmm 4/14/09

– If you need more information, use these O.S. resources –
Click Here: Manufacturer's Product Web Page
Email: enginesupport@hobbico.com
Web Site: http://www.osengines.com/
Phone: 217-398-8970
  Postal Address:
O.S.
3002 N. APOLLO DRIVE, SUITE #1
CHAMPAIGN, IL 61822

Click here for Units of Measure Conversion Calculators

Accessories Needed
 
COMPLETION NOTES FROM THE TECH DEPARTMENT
THIS IS THE O.S. MAX 28 XZ TRUGGY ENGINE. FEATURES: LARGE SIZE OUTER HEAD, T-TYPE PLUG (TURBO PLUG), NEW 21J CARBURETOR, SLIDE VALVE 3-NEEDLE CARBURETOR, EXTRA HEAD SHIM, 6-PORT PISTON SLEEVE, OILED BUSHING CON ROD REQUIRES: 10-30% NITRO FUEL, TRACK EQUIPMENT

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Primary Accessories Radio & Engine Equipment Building & Field Equipment Optional Accessories

 
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