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: 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 INCLUDES: 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 REQUIRES: Fuel: 10-30% nitro content (20% for break-in) Air Filter: MSFG1660 Exhaust system depending on vehicle, see COMMENTS Track equipment SPECS: Displacement: 0.25 cu in (4.09cc) Output: 3.1 PS, 3.06 HP/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 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. jxs 02/15/10 ir/jxs