ULTIMATE Motor M-3S UR3401-M3S

ULTIMATE Motor M-3S UR3401-M3S ULTIMATE Motor M-3S UR3401-M3S ULTIMATE Motor M-3S UR3401-M3S ULTIMATE Motor M-3S UR3401-M3S ULTIMATE Motor M-3S UR3401-M3S ULTIMATE Motor M-3S UR3401-M3S
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ULTIMATE Motor M-3S UR3401-M3S

This is the 3 port .21 Off-Road Ultimate M3S Competition Engine. The Ultimate M3T is made by the prestigious Japanese O.S. brand and it?s based on their B2102 long stroke engine. The characteristics of this engine adds to the Ultimate line all the best possible features you can have on a nitro engine, specifically designed for maximum power, performance and tuneability. With this engine you will have a great and super smooth linear power from low to high R.P.M.

The cooling head has been redesigned by Modelix. It?s not as low as the B2102 lower profile but it?s lighter so it keeps the center of gravity as low as the B2102 but improving its performance on very high temperatures.  

The Ultimate M3S engine comes with a new carburetor where high speed needle holder has been redesigned for a better refrigeration of the fuel flow into the carburetor, lowering the temp of the carb, and as a consequence it?s more stable with a great idle stability, improves fuel mileage and overall engine performace. Besides this, the uniball joint of the carb slide has also been modified with two stoppers instead of one. With this new modified design, you can easier adjust the angle of the uniball joint without having to disassemble the engine. This carb offers a higher accuracy tuning, a very interesting advantage to experienced drivers.   

The backplate is CNC machined and made of 7075-T6 Swiss Aluminum. The reason of making it with this material is to make it harder than the original and reduce the conrod-backplate friction increasing the life of the conrod and improving engine efficiency and performance. Thanks to its design, you can remove the backplate without damaging the conrod even when it is on its lower position (PMI). The lateral grooves allow to easily remove the backplate without having to use any tool that can damage it.  

The M3S crankshaft has been designed by the O.S team of engineers to ensure an optimum flow of fuel thanks to the aerodynamic design and the silicone filling. It is balanced with a tungsten weight in order to increase the inertia to rotation. Crankshaft durability has been improved thanks to the Dimond-Like Carbon (DLC) coatings.   BEARINGS In line with the high quality and performance of this engine, its two high precision ceramic made in Japan bearings ensure high idle stability, longer life and low friction at high temperatures.  

The engine is supplied with two venturis, a 6.0 and a 6.5 to adjust fuel mileage and torque.  

The sleeve with 3 inlet port and an exhaust port guarantee a low fuel consumption with a very high but smooth and linear power. Both, the sleeve and piston are made from a high strength aluminium bar to improve its durability.  


Displacement: 3,46 cc 
Power Output: 2.75 PS/2.71 hp @ 34.000rpm 
Practical Range RPM:  4.000-44.000 
Bore x Stroke: 16,27x16,80 
Sleeve: 3 + 1 ports 
Rear Ball Bearing: ceramic 
Front Ball Bearing: ceramic 
Crankshaft: 14 mm 
Carburetor: Aluminum w/ insulator gasket 
Glow plug: P3 Turbo 
Exhaust Position: rear 
Weight:  345g 
Fuel type: 25% nitro. Recommended fuel Nitrolux.