Full Bore


Cylinder boring, piston and top end kits.

Take the guess work out of rebuilding your top end with our top end rebuild kits. 

Everything you need to rebuild your top end.  

Full Bore top end kits are returned to you with everything needed for your top end rebuild, including Your cylinders bored to the next available piston size.  pistons, rings, pins, bearings, circlips, head gasket, base gasket, exhaust gaskets and any other gaskets that come in a top end gasket set for your model.

951 top end

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Pro X logo

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All work is guaranteed!!!

After we receive your cylinders we will inspect them and determine what oversize pistons it will take to make the cylinders straight then bore your cylinders on a boring bar, and final sized with a rigid hone.  The ports are chamfered in a 3 stage process to ease the rings back in, including a final hone to extend engine life, and improves performance.

The kit is returned to you with everything needed for your top end rebuild

No more trips home from the machine shop without your cylinders because the pistons weren't big enough to clean it up.  Let alone the fact you have to send those pistons back and order another set.  We keep it simple and offer solutions for your top end rebuild and get you back on the water.

All cylinder work is done here at Full Bore.

If you send your old piston we can usually tell you what caused the failure so you can keep this from happening again.

Cylinder boring, resleeving and complete top end rebuild kits for Sea Doo, Yamaha, Kawasaki, and Polaris PWC.

Find your make on the link bar on left hand side of screen or the drop down menu at the top of the page.

 Our top end rebuild kits include everything needed for your top end rebuild.

  • Pistons
  • Rings
  • Gaskets
  • Circlips
  • Upper bearings
  • Wrist Pins
  • Your cylinders bored to fit.

Boring a cylinder needs attention to detail, if it is going to be done right.  Here at Full Bore we take every precaution to make sure it is right and will custom size to what your needs are. Our strict quality control policy ensures specifications will be met. The cylinder is bored, sized, and followed by a three stage chamfer to ease the rings back in and increase engine life, and final hone for the proper cross hatch.

cylinder being bored

Cylinder boring ........... $75 each


Send your piston and we will bore your cylinder (up to 0.060" oversize) to fit.

Cylinder resleeving

Sea Doo and Yamaha PWC cylinder resleeving.

Everything from simply resleeving your cylinder and resizing back to standard bore  starting at $150 to complete resleeve kits that includes everything needed to reassemble.

For cylinder resleeving please check out our resleeve page here

Accepting credit cards through pay pal, right here on the web site.  It's the safe and secure way to pay online.

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Contact us

Email us at info@fullboreonline.com

Phone 989-340-1321

9-5 Monday - Thursday

9-4 Friday Eastern time.

Shipping address (shipping only)

Full Bore
486 S Ripley Blvd
PMB #228
Alpena, MI 49707