MXR V3 Combo ceramic + filter + Escape 2142 EFRA

This is the .21 Ultimate MXR v3 Ceramic Competition Combo, a complete set ready to install that includes the Ultimate MXR v3 Ceramic Engine, the Ultimate Racing 2142 Super Sonic Exhaust, and the Ultimate Airmax Air Filter with oiled foam. The three components have been selected and optimized together to work as a unit and extract maximum performance in competition. The engine is manufactured by the prestigious Japanese brand O.S. Engines, based on their Speed B21 square stroke engine.

In addition to the modifications that the previous version already had, such as the crankshaft, the rear crankcase cover, the engine group, the innovative 6 and 6.5mm FlowMax venturi, and the crankcase to achieve greater power without compromising consumption, the v3 incorporates a new less sensitive high needle to make it easier to find the optimal carburetion point.

With this combo, you will have an incredible power curve that provides spectacular usable power at all times. It delivers linear and smooth power at low RPMs, making it perform perfectly on bumpy circuits, while also providing great power at mid and high RPMs, with excellent feel. It is one of the engines with the best idle on the market.

The combo includes:

Ultimate MXR v3 Ceramic Engine ? .21 competition engine with 3 transfers and all the exclusive modifications of the MXR v3 series detailed below.

Ultimate Racing 2142 Super Sonic Exhaust ? High-performance exhaust designed to complement the power curve of the MXR v3, maximizing gas evacuation and expanding the usable power range in competition.

Ultimate Airmax Filter with oiled foam ? High-flow air filter with pre-oiled foam that ensures clean and efficient intake from the first use, protecting the engine and optimizing carburetion.

Highlighted features of the engine:

Carburetor: Modified OS21J3 needle holder and high needle for more stable operation and more precise carburetion.

Crankcase: Same as the v2, where work was done on the crankcase to improve internal fuel flow, thus achieving extra power and efficiency.

Filter: All Ultimate MXR v3 include a complete set of Ultimate Airmax filter.

Head: The Ultimate MXR v3 is equipped with the same head as its predecessor. This 8-fin head has a very low center of gravity and has been designed to direct most of the airflow directly to the spark plug. By cooling the spark plug, we achieve more stable carburetion and idle.

Venturi: The MXR incorporates the new 6.5mm FlowMax venturi. With a longer innovative design than standard O.S. venturis and wider at the base. The new geometry improves fluid dynamics, providing extra power and a noticeable improvement in engine autonomy.

Rear Cover: The usual red crankcase cover of Ultimate engines is made from a bar of Swiss 7075-T6 aluminum and incorporates two larger ducts that improve the engine's fuel flow, increasing power and improving consumption.

Liner and Piston: Starting from the solid base of the MXS, the Ultimate MXR has worked on the engine group and designed a new set in which the transfers have been modified to vary the intake and exhaust timings and achieve more power without compromising consumption.

Bearings: The Ultimate MXR v3 uses original O.S Engines ceramic rear bearing and a front one with steel balls and double cover from Ultimate Racing.

Technical specifications of the engine:

Displacement: 3.49 cc

R.P.M. (power): 2.65 PS @ 34,000rpm

Stroke: Square 16.40x16.40mm

Liner: 3 + 1 ports

Rear bearing: O.S Ceramic

Front bearing: Ultimate Racing Steel

Crankshaft: 14mm balanced with two tungsten bushings

Carburetor: O.S 21J3 Modified with exclusive needle holder

Spark Plug: P3 Turbo

Engine weight: 345g