#OS1FH01 - O.S. Speed B21 Adam Drake 4 Off-Road /T2090 Combo

O.S. Engines would like to introduce new O.S.SPEED B21 ADAM DRAKE 4. The latest collaboration engine with world famous O.S. Team driver Adam Drake.

The cylinder liner, crankshaft & cooling head has been redesigned to Adam Drake’s spec for better balance, more torque and more power for better driving performance.

Main changes (compared to AD3):

• Cylinder liner: Revised port-design for more torque.
• Crankshaft: Inner diameter has changed for better low to mid end power.
• Combustion chamber: Redesigned for more torque
• Outer head: Extra fin for better cooling, reduced weight, lower center gravity for better balance and new laser design with double anodized colors.

First deliveries are expected in December 2025.

Specs:

• Displacement: 3.49cc
• Bore: 16.4mm
• Stroke: 16.55mm
• Output: 2.65ps / 2.61hp @ 34.000RPM
• Practical RPM range: 4.000-42.000
• Engine Weight: 352g

Included:

• T2090 Exhaust Set: TB02 EFRA2089 Pipe & MB01-75 manifolder
• Glowplug: O.S.SPEED P3
• Reducers: 6II (blue) AL2 & 8mm (blue) AL
• Exhaust seal ring
• Dust cap set: 3/16/18mm