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O.S. OS Speed B21AD Adam Drake Edition Off-Road Nitro Buggy Engine

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The OS Speed B21 Adam Drake Edition Off-Road Buggy Engine gives you the power needed to make it to the top of the podium. This special Speed B21 engine is packed with upgrades from champion Adam Drake. Itís a terrific choice for trucks and buggies that delivers competition-caliber performance for demanding drivers. Featuring a semi-long stroke, this engine also boasts a DLC crankshaft with double tungsten counterweight and a redesigned cylinder lining with updated porting.


  • Designed and tested to Adam Drake's race-winning specifications
  • Great for buggies and trucks
  • Redesigned cylinder liner with optimized porting
  • Redesigned DLC crankshaft with double tungsten counterweight
  • Semi-long stroke configuration
  • 6.5 and 8.0 mm carburetor reducers
  • Ceramic rear bearing
  • 21J carburetor

Displacement: 0.213 cu in (3.49cc)
Bore: 0.646" (16.4mm)
Stroke: 0.652" (16.55mm)
Practical RPM: 4,000-42,000 RPM
Output: 2.65PS 34,000 RPM, 2.61HP @ 34,000RPM
Weight: 12.45oz (353g)

This product was added to our catalog on February 16, 2018

Tuesday, Dec 18 2018 (10 months ago)
O.S. OS Speed B21AD Adam Drake Edition Off-Road Nitro Buggy Engine
This engine is super high quality but it seems to be the answer to a question no one really asked. Nice, though not much different from the B2101 (not 2102) and not as powerful as the Ty 100% Spec2. I tried it in buggy and felt it has a less linear powerband than the square stroke 2101, then in truggy it didn't quite have the torque I wanted compared to a spec 2. With the B21 Ty 2 and Ty 100% Spec II, those are the buggy and truggy engines of choice in my opinion. No disrespect to Adam because he's a great guy and the engine is still very good. Ran it with 2090 pipe, P3 plug, Byron 30% fuel.
Thursday, Jun 20 2019 (4 months ago)
O.S. OS Speed B21AD Adam Drake Edition Off-Road Nitro Buggy Engine
Have this engine with over 4 gal(still has pinch). This may be one of the best engines out there, high quality, nice crisp response, does not flame out, Ive used it from start with only the thicker one of the two copper shims. Great controlable power for buggy 6.5mm vent., enough for truggy with the 8mm vent. Buy!!
Tuesday, Apr 16 2019 (6 months ago)
O.S. OS Speed B21AD Adam Drake Edition Off-Road Nitro Buggy Engine
Extremely happy with this engine. Very smooth, responsive power. Extremely crisp. I did use Adam Drakes Engine break in service and I have to say I won't do it any other way from here out. Drake had this motor tuned and ready to go. I literally ran a quart through it leaning it out on the top slightly with each tank. Adjusted the idle and I was good to go. Extremely pleased!