Ski-Doo Formula S 380 .040 Over Pistons Pair for Ski-Doo 1995-1998 Snowmobile

.040 Over Pistons - Pair for Ski-Doo Formula S 380

These .040 over pistons for Ski-Doo Formula S 380 snowmobiles from 1995-1998 replace worn or damaged stock pistons to restore cylinder bore fit and engine compression.

Overview

These .040 over pistons for Ski-Doo Formula S 380 machines are sized to fit cylinders that have been bored oversize during a top-end rebuild. The pair works for riders refreshing a 380 twin that has lost compression, scored a piston, or needs a fresh bore after a seize. Sold as a matched pair for the Formula S 380 produced from 1995 through 1998.

Built For Performance

• .040 inch oversize bore size for use with rebored cylinders
• Sold as a matched pair for the 380 twin engine
• Suited to top-end rebuilds after cylinder boring or honing
• Replaces worn or scored stock pistons to help restore compression
• Designed around the Ski-Doo Formula S 380 engine family

Fits These Machines

• for Ski-Doo Formula S 380, 1995
• for Ski-Doo Formula S 380, 1996
• for Ski-Doo Formula S 380, 1997
• for Ski-Doo Formula S 380, 1998

On-The-Job Use

• Top-end rebuilds on trail ridden Formula S 380 sleds
• Bore and hone jobs that require oversize pistons
• Refreshing engines after a cold seize or piston scoring
• Seasonal maintenance on older 380 twin models

Specs At A Glance

Good To Know

Q: Do I need to bore my cylinders before installing these pistons? A: Yes, .040 over pistons require the cylinders to be bored and honed to the matching oversize to achieve correct piston to wall clearance.

Q: How many pistons come with this order? A: This listing supplies a pair of pistons, which covers both cylinders on the 380 twin engine.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.