Cylinder Boring

We have over 30 years' experience in the Machining and Fabrication Industry and over 40 years' experience in the Powersports Industry. We bore 2 Stroke and 4 Stroke Cylinders up to 102 mm in bore diameter most for Dirt Bikes, ATVs, and Side x Side models. We use high precision CNC equipment to do our machine work and use a CMM (Coordinate Measuring Machine) with touch probes to get exact measurements within .001mm or .00005 inch (half a ten thousandth). After boring is complete, we will hone your cylinder using a Diamond Hone to get that perfect 45-degree crosshatch.

Just send us your cylinder and we take care of the rest. Your package will look like new and be ready to bolt on and go! Use our drop-down menu to find your vehicle. Purchase the Cylinder Boring Service. Print the receipt. Send us your cylinder. We will have your package back to you in about 10 to 14 days after we receive it. Contact us if you need technical help with your cylinder.

Send your cylinder to:

RebuiltPowerSports, LLC
2917 2nd Ave East
Hibbing, MN
55746

 OUR CYLINDER BORING SERVICE INCLUDES:

• Remove Cylinder Studs, Dowel Pins, Remove Old Gasket Material, Run Cylinder through Ultrasonic Cleaner.
• Inspect Cylinder Bore for wear or damage. Inspect Cylinder Sealing Surface for Flatness.
• Bore and Hone Cylinder to next oversize piston per factory service manual specifications.
• Resurface Cylinder Sealing Areas as needed per factory service manual specifications.
• Chamfer Cylinder Ports on 2 Strokes.
• Deburr any rough edges on cylinder sleeve.
• Vapor Blast, Repaint and Oven Cure Cylinder with factory OEM engine paint as needed.
• Install Cylinder Studs if required. 
• We supply you with a New Piston Kit, New Top End Gasket Kit, New OEM Dowel Pins.
• Piston Kits include Piston, Piston Rings, Piston Wrist Pin and Piston Circlips. 
• Top End Gasket Kits come with Gaskets, O-Rings, Sealing Washers, Valve Stem Seals and Exhaust Gasket.
• We Pay the Return Shipping too!

TYPES OF CYLINDER SLEEVES EXPLAINED:

AC - Original cylinder bore is alloy-chrome plated, Nikasil, or Electrofused. The cylinder plating needs to be removed and must be bored to accept the new cylinder sleeve. Then new plating will be applied.

CS - Original block has a cast-in sleeve liner in the cylinder. The cylinder must be bored out to accept the new cylinder sleeve. The cast-in liner will be bored completely out of the cylinder. Do not try to push out the cast-in liner, cylinder damage may be the result.

CI - Original block has a cast-in liner in the cylinder. The cylinder must be bored to accept the new cylinder sleeve. When using a CI style sleeve the cast-in liner will not be completely removed. The sleeve is designed to insert into the iron lined cylinder.

RS - Original block has a replacement sleeve. Heat the cylinder to remove the sleeve. Reheat the cylinder to install the new cylinder sleeve.

CC - Original barrel is cast-iron. The cylinder must be bored to accept the new cylinder sleeve.

Click the DROP-DOWN MENU to find your vehicle for services, parts and pricing or fill out the Contact Form for more information.