O.S.ENGINE

O.S. MAX-B21 3.5cc Buggy Engine

Article nr: OS1EG00
Stock availability:
0 pcs
Delivery: Out of stock
Next delivery: 2025-09-05
Retail price: 2546 kr
Product description

O.S.Engine - MAX-B21 3.5cc 1/8 Buggy & 1/8GT Engine

Made for 1/8 nitro Offroad and 1/8GT
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

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:
  • Practical rpm range:
  • Weight: 352g

Included:
  • P3 glow plug
  • Reducer Venturi: 6mm (Orange) & 7mm (Yellow)
  • Exhaust seal ring
  • Dust cap set: 3, 16 & 18mm
Features
Country of origin: JP
Parts
  • Tools (2)
    Multi Glowplug Tool - Nuts: 8/5.5mm & Hex: 2.5/5mm
    Multi Glowplug Tool - Nuts: 8/5.5mm & Hex: 2.5/5mm
    50+ st
    Retail Price: €17.28
    Speed Plug Wrench O.S.SPEED
    Speed Plug Wrench O.S.SPEED
    13 st
    Retail Price: €28.65
  • Starting Equipment (2)
    Glow Starter with Meter for Sub-C battery
    Glow Starter with Meter for Sub-C battery
    39 st
    Retail Price: €34.56
    O.S. Glow Plug Turbo P3
    O.S. Glow Plug Turbo P3
    50+ st
    Retail Price: €11.24
  • Engines (37)
    Shims (0.2) 21XZ-R, 21RX-B Ver.3
    Shims (0.2) 21XZ-R, 21RX-B Ver.3
    2 st
    Retail Price: €5.81
    Piston Pin 21XZ-R, 21XR-B Ver.3,B2104
    Piston Pin 21XZ-R, 21XR-B Ver.3,B2104
    50+ st
    Retail Price: €9.22
    Needle Holder 21M (21XZ-R)
    Needle Holder 21M (21XZ-R)
    9 st
    Retail Price: €12.62
    Universal Nipple No.15
    Universal Nipple No.15
    29 st
    Retail Price: €9.22
    Connecting Rod Speed B2101,B2104, 21ZX-B
    Connecting Rod Speed B2101,B2104, 21ZX-B
    50+ st
    Retail Price: €44.68
    Carburettor Gasket 2A/S, 3A, 20C/D/M
    Carburettor Gasket 2A/S, 3A, 20C/D/M
    20 st
    Retail Price: €5.81
    Oring (S) 10D, 10F, 1H-3H, 20E, 40B, 40J
    Oring (S) 10D, 10F, 1H-3H, 20E, 40B, 40J
    33 st
    Retail Price: €5.81
    Slide Valve Stopper 21J
    Slide Valve Stopper 21J
    2 st
    Retail Price: €9.22
    Carburettor Slide Valve 21J
    Carburettor Slide Valve 21J
    1 st
    Retail Price: €25.25
    Dust Cap Set O.S.SPEED (3/16/18mm)
    Dust Cap Set O.S.SPEED (3/16/18mm)
    18 st
    Retail Price: €9.22
    Cover Plate Gasket 21XZ, 21RX-B Ver.3,30VG, 35AX,B2104
    Cover Plate Gasket 21XZ, 21RX-B Ver.3,30VG, 35AX,B2104
    25 st
    Retail Price: €9.22
    Needle 21C, 21E, 21F, 21J, 20E, 20B, 20A
    Needle 21C, 21E, 21F, 21J, 20E, 20B, 20A
    4 st
    Retail Price: €11.42
    Ball Bearing Rear 21V-Spec, 28XZ, 30VG, 21XR-B Ver.3
    Ball Bearing Rear 21V-Spec, 28XZ, 30VG, 21XR-B Ver.3
    34 st
    Retail Price: €51.49
    Ball Bearing Front 21XZ-B
    Ball Bearing Front 21XZ-B
    41 st
    Retail Price: €21.84
    Mixture Control Valve Assembly 20K, 21J
    Mixture Control Valve Assembly 20K, 21J
    3 st
    Retail Price: €15.03
    Metering Needle Assembly 21C, 21J
    Metering Needle Assembly 21C, 21J
    4 st
    Retail Price: €13.82
    Carburettor Retainer 21E/H/J
    Carburettor Retainer 21E/H/J
    0 st
    Next delivery: 2025-09-26
    Retail Price: €11.42
    O-Ring Carb Retainer 2 (7B, 20G)
    O-Ring Carb Retainer 2 (7B, 20G)
    17 st
    Retail Price: €5.81
    Set Screw M3x3mm
    Set Screw M3x3mm
    2 st
    Retail Price: €5.81
    O-Ring (S-3)
    O-Ring (S-3)
    3 st
    Retail Price: €5.81
    Carburettor Gasket 20E, 7D, 60F, 60MC, 70D
    Carburettor Gasket 20E, 7D, 60F, 60MC, 70D
    11 st
    Retail Price: €5.81
    Carburettor Insulator 21J3
    Carburettor Insulator 21J3
    1 st
    Retail Price: €13.82
    Piston Pin Retainer SPEED (6) 21XR-B Ver.3
    Piston Pin Retainer SPEED (6) 21XR-B Ver.3
    50+ st
    Retail Price: €9.22
    Inner Head For B21 1/8 Off-Road 16% Nitro
    Inner Head For B21 1/8 Off-Road 16% Nitro
    36 st
    Retail Price: €46.01
    Ball Link N0.6 (Throttle Arm)
    Ball Link N0.6 (Throttle Arm)
    2 st
    Retail Price: €12.62
    Dust Cover Carburettor 22D
    Dust Cover Carburettor 22D
    1 st
    Retail Price: €9.22
    Crankshaft 21XR-B Ver. 3
    Crankshaft 21XR-B Ver. 3
    1 st
    Retail Price: €54.9
    Crankcase MAX-B21
    Crankcase MAX-B21
    2 st
    Retail Price: €89.16
    Cylinder & Piston Assembly MAX-B21
    Cylinder & Piston Assembly MAX-B21
    0 st
    Next delivery: 2025-09-26
    Retail Price: €97.17
    Built-Up Parts Set C&P MAX-B21
    Built-Up Parts Set C&P MAX-B21
    0 st
    Next delivery: 2025-09-26
    Retail Price: €125.63
    Outer Head MAX-B21
    Outer Head MAX-B21
    2 st
    Retail Price: €72.13
    Inner Head MAX-B21
    Inner Head MAX-B21
    2 st
    Retail Price: €28.65
    Cover Plate MAX-B21
    Cover Plate MAX-B21
    2 st
    Retail Price: €17.23
    Carburetor Complete 22E W/O Reducer
    Carburetor Complete 22E W/O Reducer
    2 st
    Retail Price: €142.86
    Carburetor Body 22E
    Carburetor Body 22E
    2 st
    Retail Price: €79.94
    O-Ring P-3
    O-Ring P-3
    5 st
    Retail Price: €5.81
    Carburettor Reducer 7mm (Yellow)
    Carburettor Reducer 7mm (Yellow)
    2 st
    Retail Price: €10.42
  • Exhaust Systems (4)
    Exhaust Seal Ring O.S. Speed 21 (10)
    Exhaust Seal Ring O.S. Speed 21 (10)
    29 st
    Retail Price: €25.25
    Tuned Silencer TB02 T-2090SC EFRA2089
    Tuned Silencer TB02 T-2090SC EFRA2089
    5 st
    Retail Price: €137.05
    Tuned Silencer Complete Set T-2090SC
    Tuned Silencer Complete Set T-2090SC
    10 st
    Retail Price: €171.31
    Exhaust Manifold Assembly MB01-75 (M2000SC)
    Exhaust Manifold Assembly MB01-75 (M2000SC)
    4 st
    Retail Price: €52.53
  • Hardware (3)
    Hex Screw M2.6x7mm (10)
    Hex Screw M2.6x7mm (10)
    8 st
    Retail Price: €9.83
    Hex Screw M2.6x18mm (10)
    Hex Screw M2.6x18mm (10)
    5 st
    Retail Price: €9.83
    Hex Screw M3x18mm (10)
    Hex Screw M3x18mm (10)
    6 st
    Retail Price: €9.83
Popular Accessories
Inner Head For B21 1/8 Off-Road 16% Nitro
Inner Head For B21 1/8 Off-Road 16% Nitro
36 st
Retail Price: €46.01
Files/Downloads
File name Language Published
OS1EG00_Manual EN 2024-05-06
OS1EG00_Size EN 2024-05-06
GPSR

Manufacturer

Registred contact information for the products manufacturer.

Name OS Engines MFG.Co.Ltd
Address 6-15, 3-Chome Imagawa
Higashisumiyoshi-ku
546-0003 Osaka
Country Japan
Phone 0081-6-6704-2722
Email e-info@os-engines.co.jp
Homepage www.os-engines.co.jp

Importer

Registered contact information for the responsible company within the EU.

Name Minicars Hobby Distribution AB
Address Annelundsgatan 17
74940 Enköping
Country Sverige
Phone 0046-0171143000
Email info@minicars.se
Homepage https://www.minicars.se
Fits

Complete with

Tuned Silencer Complete Set T-2090SC
Tuned Silencer Complete Set T-2090SC
10 st
Retail Price: €171.31
Tuned Silencer TB02 T-2090SC EFRA2089
Tuned Silencer TB02 T-2090SC EFRA2089
5 st
Retail Price: €137.05
Exhaust Manifold Assembly MB01-75 (M2000SC)
Exhaust Manifold Assembly MB01-75 (M2000SC)
4 st
Retail Price: €52.53
Glow Starter with Meter for Sub-C battery
Glow Starter with Meter for Sub-C battery
39 st
Retail Price: €34.56
Multi Glowplug Tool - Nuts: 8/5.5mm & Hex: 2.5/5mm
Multi Glowplug Tool - Nuts: 8/5.5mm & Hex: 2.5/5mm
50+ st
Retail Price: €17.28
Speed Plug Wrench O.S.SPEED
Speed Plug Wrench O.S.SPEED
13 st
Retail Price: €28.65

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0 st
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3 st
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