O.S. PEED B21 Adam Drake Edition 2 – Off-Road Racing Engine

O.S.SPEED B21 ADAM DRAKE EDITION 2 is an evolution of the previous Adam

Drake model that was born with the advice of world-class pro-racer Adam

Drake from USA.

Features:

• The Bore/Stroke ratio of the Drake-spec engines is 16.4×16.55mm and are unique to this engine (and it’s processor).
• Newly designed crankshaft for further improved driving feeling (different tungsten balancing).
• Newupdated combustion chamber that use an additional O-ring which reducevibration and seals out most of the dirt that can accumulate around thesleevsd upper/outer edge.
• The new carburetor also has its locking screw turned around 90 degrees so its much easier to reach/tighten.
• Two carburetor venturi inserts are included: 6.5 & 7.0 mm
• Also available as a combo set including an exhaust system

Specifications:

• Stroke volume: 3.49 cc
• Bore: 16.4 mm
• Stroke: 16.55 mm
• Output: 2.61 hp @ 34.000RPM
• Practical RPM Range: 4.000 – 42.000
• Weight: 353 g