MOTOR ULTIMATE MXS CERAMIC
This is the Ultimate MXS Ceramic 3-transfer .21 Competition Engine. Like its predecessor the M3X, this engine is manufactured by the prestigious Japanese brand O.S. Engines, in this case based on its Speed B21 Ty Tessmann II edition square stroke engine, but with some modifications to the crankshaft and the rear crankcase cover to improve performance. This engine has more power and idles better than its predecessor.

With this engine you will have an incredible power curve that provides spectacular useful power at all times. It provides smooth, linear power at low RPM, making it work perfectly on bumpy circuits, and at the same time provides great power at mid and high RPM, but with great feel. It is one of the engines with the best idle on the market.

BUTT

We have redesigned the cylinder head, a little higher than the original low profile B2102 model, but with a lower weight so the center of gravity remains just as low, improving engine cooling even when the ambient temperature is high.

CARBURETOR

Unlike the previous model, the MXS comes equipped with the 21 J3 carburetor. Unlike the original OS carburetor, the high needle holder has been redesigned with fins similar to those on the cylinder head. This design allows the fuel inlet to the carburetor to be significantly cooled. Thanks to this innovative design, the carburetor temperature is cooler and more constant, and as a consequence it is more stable, achieving great idle stability, engine power increases and consumption decreases.

Another important point that has been modified is the carburetor barrel handle, which has two grub screws instead of one. The new design of this part allows the angle to be adjusted in any position without having to disassemble the engine.
This carburetor allows for more detailed carburetion adjustment, a very interesting detail for the most experienced pilots.

BACK COVER

The rear cover, CNC manufactured from 7075-T6 Swiss aluminum bar, has been redesigned with two larger tear ducts to facilitate fuel flow to the piston, significantly increasing engine power.

Thanks to its design, it is possible to remove the rear cover without damaging the piston even when it is at its lowest point (PMI). The side slots also make it easy to remove the lid without having to use any tools.

CRANKSHAFT

The MXS crankshaft uses an evolution of the B2102 crankshaft with DLC treatment in which a second tungsten weight has been added to increase rotational inertia.

BEARINGS

The MXS comes equipped with a ceramic rear bearing and a front bearing with steel balls and a double cover. Both original OS.

VENTURIS

The motor incorporates a 6.5mm venturi as standard to adjust the motor's performance to the maximum.

SHIRT AND PISTON

The sleeve and piston with 3 inlet ports and one exhaust port guarantee minimum fuel consumption, as well as smooth and linear power.

Both the sleeve and the piston are manufactured from high quality aluminum bar to guarantee the maximum durability of our engine equipment.

TECHNICAL SPECIFICATIONS

Displacement: 3.49 cc
R.P.M. (power): 2.65 PS/2.61 hp @ 34,000rpm
Practical Range: 4,000-42,000
Bore x Stroke: 16.40x16.40mm
Jacket: 3 + 1 ports
Rear bearing: ceramic
Front bearing: steel
Crankshaft: 14mm
Carburetor: 21 J3
Spark Plug: P3 Turbo
Exhaust position: rear
Weight: 345g
Fuel type: 16% nitro. Recommended Nitrolux fuel.