New to Powersport Superstore? Try our Year-Make-Model search and find the right parts for your ride by clicking "My Garage" on the upper-right! ➡

Wsm 54-305-12P Top End Kit - 0.50mm Oversized to 83.50mm Bore

SKU: 4147057

Wsm 54-305-12P Top End Kit - 0.50mm Oversized to 83.50mm Bore

WSM
$124.84
$124.84 $138.71
Sale Sold out
/
Shipping calculated at checkout.
In stock and ready for shipping
This is a pre order item. We will ship it when it comes in stock.
Bore: 83.50mm
Sizing: 0.50mm Oversize

The piston walls are treated with a nonabrasive coating which reduces heat and friction for added horsepower and greatly extends piston life. Made to exact OEM specifications.

Vehicle Fitment:

1994-1996 Polaris Big Boss 400L 6x6
1995-1996 Polaris Scrambler 400 4x4
1994-1996 Polaris Sport 400L
1994-1996 Polaris Sportsman 400 4x4
1995-1996 Polaris Xplorer 400 4x4
1996 Polaris Xpress 400L
Secure, Trusted, and Encrypted

Protected by industry-leading 256-bit SSL encryption and backed by Shopify’s PCI DSS–compliant infrastructure. Every page, click, and transaction is encrypted and monitored for threats — so you can shop with confidence knowing your data stays protected.

Parts for Every Machine

We stock aftermarket parts, gear and accessories for motorcycles, ATVs, UTVs, snowmobiles, personal watercraft, and even performance cars — all backed by expert support and live inventory.

Real-Time Fitment Accuracy

Search by Year, Make, and Model with confidence. Our proprietary vehicle fitment system ensures you’re only shown what fits — no guesswork, no returns — just parts that fit.

Fast, Trackable Shipping

We ship from over 20 U.S. warehouses — often same or next business day. Every order includes tracking and transparent fulfillment updates from start to finish, all processed through a secure, encrypted checkout.

Quick Links

Ride With Us. Stay Connected.

Follow us for real-time fitment updates, gear drops, and pro tips from the garage. No spam, just parts, tech, and news for riders like you.

Your Garage

Add a Vehicle