O.S.SPEED 21XZ-B TY-110% Off-Road Engine

• 7mm venturi insert that boosts power while reducing fuel consumption
• 4mm lower cooling head lowers overall center of gravity for improved handling

• Displacement: 3.49 cc
• Bore: 16.3 mm
• Stroke: 16.8 mm
• Carb Type: O.S. 21J3 (B) slide valve with 7mm reducer
• Crankshaft Threads: UNF1/4-28
• Engine Weight: 353 g
• Plug Type: P3 Turbo Ultra Hot Glow Plug
• RPM Range: 4.000 - 42.000 RPM
• Recommended Fuel: 10-30% nitro fuel
• Width: 45 mm (at mounting tabs)

• O.S.SPEED 21ZX-B Spec II Ty Tessman 110% Engine
• Turbo Plug P3
• Collet
• Decals
• Manual