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O.S 12520 .25XZ (P) ABC 21JN Slide

O.S 12520 .25XZ (P) ABC 21JN Slide
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Item #:125200

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. ******


  • 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


  • 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


  • 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


  • Fuel: 10-30% nitro content (20% for break-in)

  • Air Filter: MSFG1660

  • Exhaust system depending on vehicle, see COMMENTS

  • Track equipment


  • 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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