Professional Motorcycle & ATV Engine Machine Shop • Since 1983
Ken OConnor Racing provides professional engine machining for two-stroke and four-stroke motorcycles, ATVs and other powersports applications. Our services include cylinder boring and honing, cylinder sleeving and plating, crankshaft rebuilding, cylinder head machining, four-stroke cylinder head reconditioning, two-stroke porting and complete engine assembly.
No excuses. Just results.
PRECISION
BUILT IN.
Professional engine machining, performance work and complete assembly for two-stroke and four-stroke motorcycles and ATVs.
40+
years of
experience
100%
Work performed
in-house
350+
Parts brands
available
– Accurate clearances
– True crankshafts
– Proper finishes
– Proven results
what we do
THE MACHINE WORK
BEHIND THE POWER.
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Ken OConnor Racing is the leading motorcycle and ATV engine machine shop in Connecticut for a reason. From a single cylinder to a complete engine, every job gets the same focus: measure carefully, machine accurately, and build it right.
Crankshaft Rebuilding
Precision truing, pressing and rebuilding for powersport and two-stroke motorcycle crankshafts.
Cylinder boring & honing
Measured, bored and power-honed to the exact piston clearance your engine requires.
Cylinder Sleeving
We inspect the cylinder, install and machine the replacement sleeve, match the ports when required, and finish-hone the bore to the proper piston clearance.
Cylinder plating
A complete path for worn, damaged or hard to replace cylinders – done with finish and fit in mind.
complete engine assembly
Built clean, measured carefully and leak-down tested before it leaves the shop.
two-stroke porting
Purpose-built port work matched the how and where you ride – not a one-size-fits-all grind.
Cylinder head Machining
Squish clearance affects combustion efficiency, detonation resistance, and engine performance.
Cylinder head reconditioning
Four-stroke reconditioning and performance machining backed by real engine-building experience.
The Blaster Store
The parts you need.
The knowledge to
back them up.
Huge Yamaha Blaster inventory, OEM parts and access to more than 350 brands-
supported by the people who actually machine and build these engines.
✓ Hard-to-find Blaster parts
✓ Engine rebuild components
✓ Performance upgrades
✓ Real technical support
Simple from start to finish
READY TO GET
YOUR ENGINE DONE?
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You send the parts. We inspect, communicate and complete the work in our own shop.
01
Tell us about the job
Use the contact form or call the shop. Tell us the engine, the problem and your goal.
02
Ship your parts
Follow our packing and shipping instructions so everything arrives safely and identified.
03
We inspect & machine
Your parts are measured, the work is confirmed and machining is performed on site.
04
Back to you—ready
Completed work is carefully packed and returned, ready for the next step in your build.
Built on reputation
“Quality, service and price.
That’s not a slogan—it’s the standard.”
KEN OCONNOR · OWNER & ENGINE BUILDER
Your build starts here
LET’S BUILD IT
RIGHT.
Questions about machining, parts or a complete engine build? Talk directly with the shop.
860 230 5003
Ken OConnor Racing
Motorcycle & ATV Engine Machine Shop
© 1983–2026 Ken OConnor Racing. All rights reserved.
Quality. Service. Price.