OS Engines Max 21 XZ-B V2

The perfect balance between price and performance.

The 21XZ-B Version II delivers ideal performance at a reasonable price. It continues to exceed the expectations of even pro racers, delivering power comparable to the Speed Spec II at a lower price. Upgrades include a lightened cylinder head, improved cooling and a brand new 22B2 single-needle carb for easy tuning. If you're looking for incredible throttle response and the power to conquer off-road, you've found it in the 21XZ-B Version II.

• Performance that rivals the Speed 21XZ-B Spec II
• Shares the piston, liner and con rod of the Spec II
• Low center of gravity
• Blue anodized head
• Incredible throttle response
• Silicon-filled crankshaft with tungsten counter weights

Technical Specifications:

Displacement: 3.49cc

Carburetor Type: 7mm Slide

Material: Aluminium

Adjustment Needles: 3

Glowplug Type: Turbo

Exhaust Position: Rear

Fuel Type: 25% (Recommended)

Bore: 16.27mm

Stroke: 16.8mm

Pratical RPM: 3,000-41,500

Output: 2.56hp @ 34,000 RPM

Weight: 362g