72mm Racing Kit For Italjet Dragster 125 and 200 E5 to 236cc & 244cc

Feb 15, 2026 | Gepost door Michael Schebler

High-Performance 4-Stroke Racing Cylinder Kit

This high-performance 4-stroke racing cylinder kit is engineered for maximum durability, power output, and reliability under extreme racing conditions.

The cylinder is manufactured from premium cast iron and reinforced with AISI 4140 steel, featuring a precision nitriding treatment to significantly enhance surface hardness, wear resistance, and thermal stability. With a 72 mm bore, the cylinder is optimized for increased displacement and improved combustion efficiency.

The kit includes a forged aluminum piston, specifically designed for high-compression applications. The forged construction ensures superior strength, reduced weight, and excellent resistance to high temperatures and mechanical stress, making it ideal for competitive racing environments.

Sealing performance is ensured by a 2 mm steel head gasket with copper treatment, providing exceptional resistance to pressure and heat while maintaining optimal compression and long-term reliability.

Designed as a complete racing solution, this cylinder kit delivers consistent performance, improved throttle response, and extended service life for demanding 4-stroke racing applications.

A forged aluminum piston optimized for high compression ensures maximum durability at high RPM, while the 2 mm copper-treated steel gasket provides uncompromising sealing and compression stability.

Engineered for serious racers who demand performance, reliability, and consistency at the limit.

Technical Specifications – 4-Stroke Racing Cylinder Kit

Cylinder material: Cast iron

Reinforcement: AISI 4140 steel

Surface treatment: Nitriding

Bore diameter: 72 mm

Piston: Forged aluminum, high-compression design

Gasket: 2 mm steel head gasket with copper treatment

Engine type: 4-stroke

Designed to withstand high thermal and mechanical loads, this cylinder kit offers enhanced wear resistance, improved sealing efficiency, and optimized combustion performance for racing applications.

Technical Specifications – Aluminium Cylinder Head

Product Type: High-Performance Cylinder Head
Material: High-grade Aluminium Alloy
Application: Performance / Racing Engine Configuration

General Construction

Precision-machined aluminium cylinder head
Optimized port geometry for improved airflow efficiency
Reinforced structure for high thermal and mechanical stability
Integrated additional cooling holes for enhanced heat dissipation

Port Dimensions

Intake Port Diameter: 38 mm
Exhaust Port Diameter (Outlet): 25 mm

Valve Seat Specifications

Intake Valve Seat Material: C63000 (Nickel-Aluminum Bronze)
Intake Valve Seat Diameter: 26.6 mm
Exhaust Valve Seat Diameter: 25.35 mm

Valve System

Valve Stem Diameter: 5.5 mm
Designed for high RPM stability and reduced friction
Optimized seating geometry for improved sealing and durability

Cooling System

Enhanced cooling architecture
Additional cooling holes integrated into the casting
Improved thermal management under high-load conditions
Reduced risk of overheating and thermal distortion

Performance Features

Increased airflow capacity
Improved combustion efficiency
Enhanced durability under extreme operating conditions
Suitable for performance and racing applications

Technical Specifications – 40 mm Throttle Body Upgrade

Product: 40 mm Throttle Body Kit
Manufacturer: Magneti Marelli (MIU-4 Series)
Application: Performance Upgrade Kit (matched with custom intake manifold)

Throttle Body – Key Features

Type: Drive-by-cable / electronic throttle body (depending on configuration)
Manufacturer: Magneti Marelli – MIU 4 series
Body Material: High-grade aluminium with corrosion-resistant finish
Throttle Plate Diameter: 40 mm
Butterfly Valve: Precision-balanced for smooth airflow and response
Spindle/Bushing: Low-friction design for consistent throttle operation

Performance Characteristics

Increased volumetric airflow compared to stock throttle body
Optimized airflow profile to support higher engine output
Enhanced throttle response and reduced restriction
Compatible with performance intake manifold for maximum efficiency

Design Integration

Matched Intake Manifold: Custom designed for 40 mm throttle body
- Precision machined flange for perfect throttle body fitment
- Smooth, high-flow internal contours to minimize turbulence
- Designed to complement upgraded cylinder head airflow characteristics
Sealing: High-quality gasket interface for positive sealing and minimal leakage
Mounting: CNC-machined mounting points for accurate alignment

Compatibility & Installation

Designed specifically as part of this upgrade kit
Bolt-on installation with no major modifications required
Compatible with supporting sensors and fuel management systems (ECU tuning may be required)
Includes hardware and sealing components for secure assembly