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#OS1EG01 - O.S. SPEED MAX-B21 Combo Set
Key Specs
About this product
O.S.Engine OS1EG01 – MAX-B21 3.5cc 1/8 Buggy Engine with Exhaust System Combo
Made for 1/8 nitro Offroad MAX-B21 is easy to use from entry-level users to sports users and has excellent cost performance. Based on the O.S.SPEED B2104 series engine, it has a well-balanced combination of smooth speed and power delivery and can be used in both on and off-road racing situations. Features:
The crankcase is based on the O.S.SPEED B2104 crankcase
Piston and sleeve is improved based on O.S.SPEED B2104
The connecting rod is the same as the O.S.SPEED buggy engines
Included Exhaust System for 1/8 Buggy (not GT): TB02 EFRA2089 (T2090) Pipe/Muffler and MB01-75 (M2000SC) Exhaust Manifolder
This engine will replace the MAX-21 XR-B VER.3 and MAX-21 XZ-B VER.2. Specs:
Displacement: 3.49cc
Bore: 16.27mm
Stroke: 16.80mm
Output: 2.6ps @ 34.000RPM
Practical rpm range: 4.000-41.000
Weight: 361g
Included:
P3 glow plug
Reducer Venturi: 6mm (Orange) & 7mm (Yellow)
Exhaust seal ring
Dust cap set: 3, 16 & 18mm
ITB02 EFRA2089 (T2090) Pipe/Muffler and MB01-75 (M2000SC) Exhaust Manifolder
Frequently Asked Questions
The MAX-B21 is designed for both entry-level and experienced users, so beginners can use it, though you'll need basic familiarity with nitro engine operation, tuning, and maintenance. If you're completely new to nitro RC, consider seeking guidance on starting procedures and glow plug use.
The combo set includes the 3.5cc engine, P3 glow plug, two reducers (6mm and 7mm venturi), exhaust seal ring, dust caps (3, 16, and 18mm sizes), and the exhaust system with both the TB02 EFRA2089 pipe/muffler and MB01-75 manifolder.
This engine is made for 1/8 nitro offroad buggies and includes an exhaust system specific to offroad buggies (not GT). It replaces the MAX-21 XR-B VER.3 and MAX-21 XZ-B VER.2, so check your buggy's manual to confirm compatibility with those models or contact us if you're unsure.
The MAX-B21 produces 2.6 horsepower at 34,000 RPM with a practical operating range of 4,000–41,000 RPM, providing smooth acceleration and speed suitable for both on and off-road racing.
Yes, this is an engine combo only; you'll need to source nitro fuel separately and ensure you have appropriate charging equipment for the glow plug included. Check the product manual for exact fuel specifications and charging recommendations.
