Ultimate Engine MXZ w/ Airmax filter and 2142 Super strong one-piece pipe combo

This is the Ultimate MXZ 3 Transfers Long Stroke .21 Engine with the Ultimate Airmax Air Filter. This engine is manufactured by the prestigious Japanese brand O.S. Engines, with the following characteristics:

Cooling Head
The MXZ is equipped with the same cooling head as its predecessors. This 8-fin cooling head has a very low center of gravity and has been designed to focus most of the airflow directly to the glow plug. By cooling the glow plug we get a more stable carburetion and idle.

Carburetor
Once again, the MXZ comes with the 21 J3 carburetor. Unlike the original OS carburetor, its high-speed needle holder was redesigned for better refrigeration of the fuel flow into the carburetor, lowering the temp of the carb, and consequently making it more stable with great idle stability, improved fuel mileage, and overall engine performance.

Besides this, the uniball joint of the carb slide was also modified with two stoppers instead of one. With this new modified design, you can easily adjust the angle of the uniball joint without having to disassemble the engine. This carb offers higher accuracy tuning, a very interesting advantage to experienced drivers.

Crankshaft
The MXZ comes with a 14mm crankshaft with a teardrop-shaped opening and paste in the inlet for improved flow.

Bearings
The MXZ comes with the original OS steel bearing in the rear and Ultimate Racing double-sealed steel in the front.

Venturi
The MXZ comes with the 6.5mm Ultimate Racing FLOWMAX venturi. With an innovative design, longer than the standard O.S. venturis and wider at the base, it ensures the inferior part of the venturi and the carburetor have exactly the same diameter. This new geometry improves fluid dynamics, providing extra power that allows the use of smaller venturis without decreasing power, and as a consequence, improves fuel mileage.

Sleeve and Piston
The sleeve with 3 inlet ports and an exhaust port guarantees low fuel consumption with very high but smooth and linear power. Both the sleeve and piston are made from a high-strength aluminum bar to improve durability.

AIRMAX AIR FILTER
The AIRMAX concept is to achieve maximum airflow to the carburetor, while respecting the external dimensions of the filter to try to fit most of the 1/8 offroad cars and bodies. This is achieved by means of a short, large-diameter tapered rubber connector tube that accelerates airflow and an internal filter structure with a larger surface area, without compromising engine protection. The result is a noticeable increase in engine power and performance.

The rubber connector tube is highly resistant to prevent unwanted damage.

The filter is supplied with a pre-oiled single layer foams, and includes a filter cover with pre-marked holes that can be used on rainy days.

Includes 2 adjustable plastic brakets to fit different cars. One is to fix it higher or lower. The other is to fix it closer or further horizontally. Both brackets have adjustable holes to give some leeway for easy adjustment.

Includes 4 screws and 2 plastic ties for complete mounting of the filter and brackets.

Technical Specifications

• Displacement: 3.49 cc
• Bore: 16.27 mm
• Stroke: 16.80 mm
• Sleeve: 3 + 1 ports
• Practical RPM range: 4,000 – 40,500 rpm
• Max. power output: 2.55 hp at 34,000 rpm
• Weight: 350 g
• Crankshaft: 14 mm
• Carburetor: 21 J3
• Glow plug: P3 Turbo
• Exhaust Position: Rear