Shopping Cart
There are no more items in your cart
OS MAX B21 engine itself
OS1EG00
OS MAX
OS MAX-B 21 is a 3.49cc internal combustion engine suitable for 1/8 Buggy and 1/8 GT models. Power 2.60 PS at 34,000 rpm, speed range is 4,000 - 41,000 rpm, Turbo spark plug, weight 361 g.
Express delivery
Large selection of carriers
Satisfaction guarantee
The all-NEW OS MAX B21 engine is once again a bit better than its predecessor, as usual with OS MAX.
Since every second on the track is fought hard in the 1/8 OFF-Buggy competition, your advantage starts with the OS MAX Motor B21.
The B21 engine has been completely reworked and again something to improve has been found. It is reliable with the proven carburetor 21-J3-1, from which the engine is easier to tune and debug to the smallest detail. The blue aluminum cooling head ensures consistent performance even in harsh temperature conditions. Its shape is now the same as its big brothers from the SPEED series.
With the OS MAX-B21 combustion engine, you can compare yourself to the competition as if it wasn't there. The engine can be tuned using high-quality OS Speed parts, allowing you to fully exploit the potential of your chassis. Equip your RC MODEL with the OS MAX-B21 motor and start choosing your place on the stage.
The 21 J3-1 carburetor has two color-different plastic diffusers that can be quickly and easily changed to fine-tune for track conditions. The yellow 7mm diffuser gives you more in the low end, while the red 8mm diffuser gives you more in the top end.
Blue anodized aluminum cooling head provides excellent cooling.
The legendary P3 OS MAX glow plug is also included in the engine package
- Developed for beginner RC OFF-ROAD Buggy and GT ON-ROAD racers in 1/8 scale
- Highly reliable engine with low maintenance
Technical parameters
- Distance of fixing holes along [mm]: 21mm
- Distance of fixing holes across [mm]: 37mm
- Version: 2-stroke nitro
- About mounting hole [mm]: 3.3 mm
- Bore [mm]: 16.27mm
- Stroke: 16.8mm
- Width [mm]: 45 mm
- Speed range approximately: 4000-41000 rpm
- Total engine weight [g]: 361g
- Height approx [mm]: 102.0mm
- Displacement [ccm]: 3.49 cc
- Length to hub: 65.5 mm
- Total length approx [mm]: 95mm
- Power (PS) at: 2.60 at 34,000 rpm
- Carburetor: 21-J3-1 V3
- Diffuser: 6 mm (orange) for 1/18 Off Road and 7 mm (yellow) for 1/8 GT ON-ROAD models
- Shaft thread: UNF1/4.28
Heating fuel for RC cars specially developed for recreational and sports driving with a composition optimized for high performance and easy engine adjustment. Contains 9% mixture of synthetic and castor oil and 25% nitromethane. Packaging 1 liter.
Last items in stock
Heating fuel for RC cars specially developed for recreational and sports driving with a composition optimized for high performance and easy engine adjustment. Contains 9% mixture of synthetic and castor oil and 25% nitromethane. 5 liter packaging.
Heating fuel for RC cars (1/8 Off-Road) specially developed for racing driving with a composition optimized for extremely high performance. Contains 9% mixture of synthetic and castor oil and 16% nitromethane. Packaging 3 liters.
Heating fuel for RC cars (1/8 Off-Road) specially developed for racing driving with a composition optimized for extremely high performance. Contains 9% mixture of synthetic and castor oil and 16% nitromethane. 5 liter packaging.
Heating fuel for RC cars specially developed for racing driving with a composition optimized for extremely high performance. Contains 9% mixture of synthetic and castor oil and 25% nitromethane. 5 liter packaging.
Last items in stock
Heating fuel for RC cars specially developed for racing driving with a composition optimized for extremely high performance. Contains 9% mixture of synthetic and castor oil and 30% nitromethane. Packaging 3 liters.
Heating fuel for RC cars specially developed for racing driving with a composition optimized for extremely high performance. Contains 9% mixture of synthetic and castor oil and 30% nitromethane. 5 liter packaging.
Special OFF ROAD TURBO candle.
Special OFF ROAD TURBO candle.
Special OFF ROAD TURBO candle. Compared to the silver version, it excels in better throttle response at low and medium speeds.
Special OFF ROAD TURBO candle. Compared to the silver version, it excels in better throttle response at low and medium speeds.
Last items in stock
Kit of a top buggy racing chassis with 4WD drive. Model without electronics and RC kit.
Last items in stock
Building kit of a high-end buggy racing chassis with 4WD drive. Model without electronics and RC kit.
Last items in stock
Building kit of a high-end buggy racing chassis with 4WD drive. Model without electronics and RC kit.
Tap to zoom
