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O.S. MAX 21XZ-B V2


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234,96 €

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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

Comunicado COVID-19


Dear friends,

Given the situation triggered by the evolution of the latest events, concerned with preventing further spread in time of Covid-19, our physical stores in Lisbon and Amadora will be closeduntil next January 30th.


Thus, beginning on January 15th, orders accepted on our website will be dispatched on Tuesdays and Thursdays of each week, with the estimated delivery time being no more than 2 working days. This is as long as the current containment measures are maintained and the transport services operate normally, as long as stocks of stock permit.

During this period, a single telephone line works: 917606615
All others will be inoperative.

Thus, we appreciate that all contacts are preferably made by email:

In this more difficult way of working, some lapses can happen, so we ask for your understanding.

We live in unique and difficult times for everyone, which only with mutual assistance can we win. It is not too much to remember that it is a widespread problem common to all. We must therefore take all possible precautions, protecting ourselves individually and collectively.

We look forward to returning to your company, and to normal work quickly.

Cordial greetings.


The management

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