O.S 12520 .25XZ (P) ABC 21JN Slide
This is the 2-stroke O.S. Max 25XZ (P) 1/8 scale 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
O.S 12520 .25XZ (P) ABC 21JN Slide
Designed for 1/8 scale truggy racing competitions
Meets ROAR regulations
ABC piston and liner construction "A"luminum piston fitted to a "B"rass cylinder liner that is "C"hrome plated
Three needle 21JN slide valve carburetor
8mm red carb insert for smaller tracks that restrict air intake
Ten fin blue anodized cooling head with inner head button
P3 ultra hot turbo glow plug
Specifications
Displacement: 0.25 cu in (4.09cc)
Output: 3.1ps/33,000 RPM
Bore: 0.689" (17.5mm)
Stroke: 0.669 cu in (17mm)
Practical RPM Range: 4,000-39,000 RPM
Weight: 13.05oz (370g)
Distance between Mounting Holes Same Side: 0.83" (21mm)
Distance between Mounting Holes Opposite Side: 1.4" (37mm)
Length from Backplate to Drive Washer: 2.6" (65.6mm)
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" (44mm)
Height/bottom of Mounting Flanges/top of Cylinder Head: 3.7" (93.2mm)
Height/bottom of Crankcase/top of Cylinder Head: 4.3" (109mm)
Needle Settings: Preset at factory, start engine as is. If adjustments are ever required, make them in small increments.
High Speed: 3.5 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
Contents
O.S. Max 25XZ (P) Truggy Engine with instruction manual, 8mm carb reducer, exhaust gasket, dust cap set, instruction manual and P3 turbo glow plug
Requirements
Fuel: 10-30% nitro content (20% for break-in)
Air Filter: MSFG1660
Exhaust system depending on vehicle, see COMMENTS
Track equipment
Comments
The O.S. Max T-2060 WN Speed Tuned Pipe OSMG2939, OSMG2938 is an ideal exhaust system for the 25XZ.
Flywheel sets are required (OSMG2648 for Mugen, OSMG2649 for Kyosho, both sold separately) for certain truggy models.
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