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O.S. Speed 21XZ-GT With 21J3


1/8 scale GT Touring class racing is becoming increasingly popular, and O.S. has developed the perfect power plant for dominating the competition. The Speed 21XZ-GT boasts many of the advances that Speed engines are famous for, with special modifications that make it ideal for on-road applications. For the maximum performance GT Touring drivers demands, the Speed 21XZ-GT is the obvious choice.


  • Long stroke engine provides more torque
  • Five scavenger ports and three exhaust ports improve power in the mid- to high range
  • The crankshaft has been engineered for GT touring, and is silicon-potted and DLC coated with tungsten weights pressed in
  • The outer head features a lower CG and shiny fins
  • The dual adjustable carb is ROAR-legal, and comes with a 7mm restrictor




Displacement: 0.213 cu in (3.49cc) 
Bore: 0.641 in (16.27mm) 
Stroke: 0.661 in (16.80mm) 
Practical rpm: 4,000-42,000 
Power Output: 2.61 hp/2.65 ps @ 34,000 rpm 
Weight: 12.45 oz (353g) 
Includes: Turbo P-3 plug 


Price: SGD$509.35