Same mounting dimensions as .21 size engines making upgrading easier Advanced Bi-Metallic Liner (ABL) cylinder liner construction This process uses a double layer of plating material rather than one thick layer. This helps the metal bond to the cylinder and is more durable. Also, the plating process is more consistent, resulting in a more precise fit between piston and sleeve for better compression and longer life. Machined aluminum piston, 3-port cylinder liner and double bushed knife edge connecting rod 21E single needle Slide Valve Carburetor (OSMG2456) with insulated sleeve to prevent fuel vaporization SG (pilot) type oversized crankshaft with rubber-sealed front bearing and oversized rear bearing to handle high torque loads Two year limited warranty

SPECS:
Displacement: 0.298 cu in (5.0cc)
Bore: 0.728" (18.5mm)
Stroke: 0.717" (18.2mm)
Practical RPM: 4,000-36,000
Power Output: 3.0 ps/28,000 RPM
Weight: 12.7oz (360g)
Crankshaft Size: 1/4-28
Factory Needle Valve Setting: 2-3/4 turns OPEN from fully closed
Mixture Control Valve Setting: Needle head flush with the side of ball link housing then back in 1-1/2 turn
Distance Between Mounting Holes Same Side: 0.83" (21mm)
Distance Between Mounting Holes Opposite Side: 1.4" (37mm)
Distance Between Mounting Holes Diagonal: 2.3" (59mm)
Height Bottom of Mounting Ears to Top of Cylinder Head: 3.8" (97.7mm)
Width of Mounting Ears: 1.8" (45mm)
Width of Crankcase Below Mounting Ears: 1.2" (30.8mm)
Distance from Front Bearing to End of Crankshaft: 1.2" (29.5mm)
Distance from Center of Engine to Front Bearing: 1.7" (44mm)
Distance from Center of Engine to Backplate: 0.85" (21.6mm)