Motorcycle and ATV Engine Machine Shop Services
Ken OConnor Racing is a professional motorcycle and ATV engine machine shop providing precision engine machining, rebuilding and performance services for customers throughout the United States and worldwide.
From cylinder boring and honing to crankshaft rebuilding, cylinder head machining, two-stroke porting and complete engine rebuilding, our goal is simple: accurate machine work, careful assembly and dependable results.
Our engine machining and assembly services are performed at our Danielson, Connecticut machine shop, giving us control over the work from initial inspection and measurement through final machining and assembly. We work on recreational, trail and high-performance motorcycle and ATV engines, including Yamaha Blaster engines and many other two-stroke applications.
Browse our engine machining and rebuilding services below to learn more about each service.
Professional motorcycle and ATV crankshaft rebuilding, pressing and precision truing for reliable two-stroke engine performance.
Cylinder Boring
Precision motorcycle and ATV cylinder boring and honing for correct piston clearance, bore geometry, ring seal and long engine life.
cylinder head machining
Professional motorcycle and ATV cylinder head machining for proper compression, squish clearance and improved two-stroke engine performance.
Professional four-stroke motorcycle and ATV cylinder head reconditioning, including inspection, valve service, seat work and precision machining.
Cylinder plating
Professional cylinder plating services for worn or damaged motorcycle and ATV cylinders, finished to the correct bore size and piston clearance.
Cylinder Sleeves
Professional motorcycle and ATV cylinder sleeving and precision machining for worn, damaged or otherwise unusable engine cylinders.
Professional motorcycle and ATV engine rebuilding and assembly with precision measurements, correct clearances and careful in-house workmanship.
two stroke porting
Professional two-stroke porting for motorcycle and ATV engines, tailored to engine setup, exhaust system and intended riding or racing application.
Flywheel Lightening
Precision motorcycle and ATV flywheel lightening to reduce rotating mass and improve throttle response and engine acceleration.
Professional two stroke Engine Rebuilding Services
Professional two-stroke engine rebuilding for motorcycles and ATVs, including precision machine work, component inspection, correct clearances and complete engine assembly.
Professional Engine Machining & Rebuilding
Accurate engine building starts with accurate machine work. Ken OConnor Racing provides the machining services necessary to properly repair, rebuild and prepare motorcycle and ATV engines for dependable service or increased performance.
Components are inspected and measured before machining so the work is based on the actual condition of the engine—not guesswork. Cylinder, crankshaft, cylinder head and engine assembly services can be performed individually or combined as part of a complete engine rebuild.
Two-Stroke Engine Machine Shop
Two-stroke engines require precise cylinder clearances, crankshaft alignment, sealing and port geometry. We provide professional two-stroke engine machining and rebuilding for Yamaha, Honda, Kawasaki, Suzuki and other motorcycle and ATV applications.
Yamaha Blaster owners can also take advantage of our extensive experience with the Yamaha YFS200 engine, including cylinder machining, crankshaft rebuilding, performance porting, cylinder head modifications and complete engine builds.
Ship Your Engine or Components to Us
You don’t have to be local to use Ken OConnor Racing. Customers can ship engines, cylinders, crankshafts, cylinder heads and other components directly to our Connecticut machine shop for service.
Contact Ken OConnor Racing to discuss your engine, the work it needs and the goals for your build.