• Tungsten-weighted silicone filled crankshaft creates optimum balanc for consistent low and mid speed torque.:
• ABC piston and liner construction Aluminum piston fitted to Brass cylinder liner that is Chrome plated.:
• 21J2 slide valve carburetor with 7mm carb reducer that restricts th airflow helping to increase the amount of torque produced.:

• Displacement: 0.213 cu in (3.49 cc):
• Bore: 0.640 (16.27 mm):
• Stroke: 0.661 (16.8mm):
• Practical RPM: 4,000-40,000:
• Power Output: 2.55 PS, 2.51 HP/33,000 RPM:
• Weight: 12.52oz (362g):
• Distance Between Mounting Holes Same Side: 0.83 (21mm):
• Distance Between Mounting Holes Opposite Side: 1.45 (37mm):
• Height Bottom of Mounting Tabs/Top of Cylinder Head: 3.4 (86.3mm):
• Width of Mounting Tabs: 1.8 (45mm):
• Distance from Backplate to Front Bearing: 2.5 (64.5mm):
• Distance from Center of Crankshaft to Front Bearing: 1.7 (44mm):
• Distance from Center of Crankshaft to Backplate: 0.81 (20.5mm):

O.S. 21XZ-B ABC Off-Road Engine with 21J2 Carburetor, Exhaust Gasket, P3 Turbo Ultra Hot Glow Plug, 7mm Carb Reducer, Instruction Manual, and two Dust Caps

Carburetor Settings, NOTE carburetor is preset at factory and requires very small adjustments Needle Valve: Approximately 3.5 turns open from fully closed Throttle: Approximately 0.5mm open from factory setting with reducer removed Metering Needle: Rotate until slotted head is 1.5mm away from ball link body Mixture Control Valve: Rotate until slotted head is flush with carb body: