Full Bore


Ski Doo top end rebuild kits.

Complete with pistons, cylinder boring, gaskets and upper bearings.

Pro x and wiseco piston kits for ski doo snowmobiles. Parts only or complete with cylinder boring. Email us for a price quote at info@fullboreonline.com

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

Everything you need to rebuild your top end.  

Ski Doo, Yamaha and Polaris top end rebuild kits are being added daily.

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.

Featuring Pro x and Wiseco pistons in our snowmobile top end kits.

Pro x logo

Piston Kit Features The ProX Racing Parts snowmobile pistons. Top level durability, quality and performance as you would expect from a ProX Racing Parts. Good and reliable parts that will increase the life span of your motor. ProX Racing Parts pistons for snowmobiles have the following special features:

• High quality cast piston made with dedicated tooling and molding

• Made from Hypereutectic alloy for extra strength and reduced expansion

• Special dual ring set up for improved durability and resistance to wear

• Full MOS2 skirt coating for improved breaking in and resistance to scuffing

• Anodized piston dome for increased protection against excessive heat

• Usage of high quality rings such as Riken for optimum heat transfer and sealing

• Packed in a box containing piston, rings, pin and clips A full ProX Racing Parts piston kit including: rings, pin & clips.

With these features and quality level, pistons from ProX Racing Parts are both a very reliable and cost effective way to maintain the engine of your sled in excellent condition!

Full Bore top end kit with pro x pistons

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 snow.

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.

Find your make on 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.

Full Bore boring cylinder

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Turnaround time

Turnaround time is running 7-10 business days on our top end kits.

Placing an order is straight forward.

First find what you are looking for and make the payment right here on the website.

After making payment with buy it now button, ship your cylinders with a copy of receipt, contact phone #, return shipping address and any special requests.

If paying with a cashier check (certified bank check)  please contact us at info@fullboreonline.com to let us know it is coming so we can keep it in mind for scheduling.  Please note that we schedule our  workload by payments received and or deposits.  Shipping us something overnight doesn't mean we can do it immediately.  If you are in that big of a hurry, be sure to find out our current turn around time before ordering. 

kits are being added daily.

be sure to check back and refresh your page.

Don't see your engine? email us for a quote.

Contact us

Email us at info@fullboreonline.com

 Phone 989-340-1321

Mon - Thur 9-5, Friday 9-4

Eastern time.

Shipping address (shipping only)

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