OS 12 TR with slide carb (pilot-shaft crank)

後排車用競技級引擎

Any on-road engine can offer like-new performance — when it's new. But the question is, how long will it last? With a 12TR, the power to compete and the power to last are one and the same.

Designed for competition, convenience and heat control, 12TR Engines put 1.1 bhp on-track — a full 10% more than .12CV engines. And to maintain that level of performance, 12TR design includes a wide variety of features designed to defeat the heat, and help the 12TR keep its cool, even when the action is hot. Screwdriver-adjustability and a choice of carburetor and shaft options make the 12TR a fine choice for 1/10 scale racing — and a lasting investment in racing power.

O.S.'s first rear-exhaust .12 engines allow air to follow the path of least resistance as it enters the front intake, to minimize turbulence that can affect performance.

Designed to minimize heat's long-term effects on performance with:
 

• A high-hat, flow-through heat sink head;
  
   
• Dark blue alumite finish to maximize the head's heat-radiating properties;
  
   
• More surface area exposed to cooling air. Finned area extends down past the head onto the upper crankcase;
  
   
• Heavy-duty webbing to prevent heat-related crankcase distortion and binding in bearing areas.
   

SPECIFICATIONS

Displacement: 0.129 cu in (2.11 cc)
Bore: 0.551 in (14 mm)
Stroke: 0.539 in (14 mm)
Practical rpm Range: 4,000-36,000
Output: 1.1 bhp @ 30,000 rpm
Weight (Pilot Shaft): 7.27 oz (210 g)
Include: #A5 glow plug & #102 Air Cleaner