Professional Motorcycle & ATV Engine Assembly

Proper engine assembly requires more than installing new parts. Clearances must be accurately measured, components carefully inspected, and every fastener assembled according to the correct specifications.

Ken OConnor Racing provides professional motorcycle and ATV engine assembly for single-cylinder two-stroke and four-stroke engines. With over 30 years of engine-building and machining experience, every assembly is completed with close attention to cleanliness, accuracy, reliability, and performance.

Engine Assembly

Racing engine for motorsports and performance vehicles.

Two-Stroke and Four-Stroke Engine Assembly Services

Modern motorcycle and ATV engines require specialized tools, precision measuring equipment, service information, and proper assembly procedures. Attempting an engine build without the correct equipment can result in damaged components, improper clearances, premature wear, or complete engine failure.

Our engine assembly process may include:

  • Inspection and measurement of engine components
  • Cleaning and preparation of parts
  • Crankshaft and transmission installation
  • Bearing, seal, gasket, and locking-tab installation
  • Correct crankcase assembly procedures
  • Cylinder and piston installation
  • Cylinder head and valvetrain assembly
  • Fastener tightening to proper torque specifications
  • Verification of engine operation and critical clearances
  • Two-stroke engine leak-down testing when applicable

Experienced Motorcycle and ATV Engine Builder

Ken OConnor Racing has been building race-proven engines for more than 40 years. Our in-house machining experience allows us to identify problems that may be overlooked during a basic parts replacement or engine assembly.

We work with motorcycle and ATV engines used for recreation, restoration, racing, and high-performance applications. Every engine is assembled using professional equipment and proven procedures—because an engine is no place to cut corners.

Engine component diagram for Ken OConnor Racing, showcasing detailed parts and assembly.
Technical diagram of racing transmission parts and assembly for high-performance motorsport vehicles.
Detailed diagram of a carburetor for Ken OConnor Racing engines.
Engine component diagram for racing applications.
Technical diagram of Keno Connor Racing gearbox components and assembly.
Engine diagram of Keno Connor Racing vehicle, showcasing detailed mechanical components.
Detailed diagram of racing gear components for high-performance vehicles.

Ship Your Engine to Ken OConnor Racing

Customers can ship engines and components to Ken OConnor Racing for professional assembly. Visit our shipping page for packing instructions, or contact us before sending your engine

pricing

Engine Assembly
Single Cylinder Two Stroke$750-$800
Single Cylinder Four Stroke$850 – $925

Final pricing depends on the engine model, condition, parts supplied, and work required. Contact Ken OConnor Racing before shipping your engine to confirm availability, pricing, and required components.

We ship and receive worldwide daily.