This is the OS Max .12CV-RX Car/Buggy Engine with #10C Slide Carburetor. Includes Recoil Starter Convenience.

FEATURES:

• True ABC construction, aluminum piston with chrome plated brass cylinder liner. Three larger cylinder intake ports instead of two smaller intake ports add 40% to 45% increased port volume over the original CVs. The third port points directly at the exhaust port, making exhaust scavenging more efficient. More air/fuel mixture with more
  efficient flow equals more horsepower.
• Crankshaft is 1mm larger in diameter, increased from 9 to 10mm. This
  allows for a larger crank port feed and smoother mixture flow.
• Bearings to crankshaft fit is tighter, increasing vacuum, crankcase pressure and reduced oil discharge from the front bearing.
• Front and rear ball bearings are thicker and have larger balls inside that are better able to handle the increased loads.
• Connecting rod is machined aluminum instead of original CVs cast-aluminum rod, and it has larger ends with bronze bushings in both.
• Wrist pin is held in by C-clips instead of nylon buttons for reduced friction.
• Side exhaust
• Slide #10C 2-needle carburettor
• Blue/Silver horizontal 9-fin cylinder head

INCLUDES:

• One Assembled .12CV-RX Engine with #10C Slide Valve Carb and recoil starter.
• One Super 102S Air Cleaner with 3 Blue Foam Elements
• Four 3x15mm Phillips-Head Round Head Screws
• One Set of Instructions w/Parts List and Decal Sheet
• One #8 Glow Plug

SPECS:

• Displacement: 0.129 cu in (2.11cc)
• Weight: 258g (9.1)
• Bore: 0.55" (14.0mm)
• Stroke: 0.54" (13.7mm)
• Power Output: 1.0 bhp / 31,000 rpm
• Practical RPM: 4,000 - 36,000
• Crankshaft Thread: 5mm
• On-Center Mounting Holes, Front to Rear: 11mmm
• On-Center Mounting Holes, Side to Side: 31.4mmm
• On-Center Exhaust Mounting Holes: 27.5mm
• Back of engine to front of drive washer: 2.23" (56mm)
• Height: 3.25" (83.7mm)
• At idle, barrel opening: 1mm
• High speed needle: 2 turns counter-clockwise out from closed position
• Low speed needle: Screw in until flush with outside of carb body, then screw it in 2-1/2 turns further.