Moto-Ski Mirage I II IIE III 377 cc .040 Over Pistons Pair for Moto-Ski 1980

.040 Over Pistons - Pair for Moto-Ski Mirage I, II, IIE, III

These .040 over pistons are replacement engine components sized for 377 cc applications, built for top end rebuilds on for Moto-Ski Mirage snowmobiles with a bored-over cylinder.

Overview

This pair of .040 over pistons is a rebuild component sized for 377 cc engines used in for Moto-Ski Mirage I, II, IIE, and III snowmobiles from 1980 through 1985. When a cylinder is scored or out of round, boring it oversize and fitting matching pistons brings the top end back into spec. They suit riders and mechanics refreshing a vintage for Moto-Ski Mirage.

Built For Performance

• .040 inch oversize sizing to match a rebored cylinder
• Sold as a matched pair for complete top end service
• Aluminum piston body with ring lands cut to oversize spec
• Designed around the 377 cc displacement used in these models
• Suited to two-stroke snowmobile top end rebuilds

Fits These Machines

• for Moto-Ski Mirage I
• for Moto-Ski Mirage II
• for Moto-Ski Mirage IIE
• for Moto-Ski Mirage III

On-The-Job Use

• Top end rebuild on a snowmobile with a worn or scored cylinder
• Freshening compression on a vintage rider before the season
• Shop or garage overhaul of an older two-stroke engine
• Restoring a machine with a previously bored-over cylinder

Specs At A Glance

Good To Know

Q: Do I need a .040 over piston? A: Only if your cylinder has been bored .040 inch oversize. Measure the bore and clearance before ordering, and confirm the piston matches your machining.

Q: What else should be replaced during a rebuild? A: Pistons and rings alone may not be enough. Check bore condition, wrist pins, bearings, and cylinder plating or honing before assembly.

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