OS Engines O.S. Speed B21 Adam Drake Edition 4 3.49cc Nitro Engine with Muffler Set (Broken-In By Adam Drake)

OSM1FH01

O.S. Speed B21 Adam Drake Edition 4 3.49cc Nitro Engine with Muffler Set 

Built in direct collaboration with ROAR Champion Adam Drake, the O.S. Speed B21 Adam Drake Edition 4 is the most refined version of this legendary competition nitro engine yet. Every critical component has been reworked to Adam Drake's exact specifications — from the cylinder liner and crankshaft to the outer head — resulting in measurable gains in torque, power, and overall driving feel across the RPM range. The newly designed three-port cylinder liner features revised exhaust dimensions that broaden the torque curve, while the updated crankshaft inner diameter sharpens throttle response in the low-to-mid range where race-winning drive out of corners is made. The redesigned combustion chamber in the inner head improves combustion efficiency to extract even more torque from every drop of fuel. Topping it all off, the new outer head arrives with a distinctive double-anodized black and blue finish with a new laser-etched design — lighter and better balanced than the previous generation, and unmistakable on the grid.

Features:

• Developed with input and track testing by ROAR Champion Adam Drake
• Newly designed three-port cylinder liner with revised exhaust dimensions for increased torque
• Updated crankshaft inner diameter for sharper throttle response in the low-to-mid RPM range
• Redesigned inner head combustion chamber for improved combustion efficiency and more torque
• New outer head features double-anodized black and blue finish with laser-etched design
• Outer head is lighter and better balanced compared to the previous model
• Includes φ6II and φ8 blue anodized reducers
• Includes O.S. Speed P3 Glow Plug, Exhaust Seal Ring, Muffler Set, and Dust Cap Set

Specifications:

In the Box: