WISECO 644M04900 Dirt Bike Piston, 0.039-Inch Oversize

WISECO ATV-DIRT BIKE PISTONS.
*  All Wiseco 4 cycle pistons come complete with rings, wrist pins and circlips.
*  Only Wiseco replacement ring sets can be used on Wiseco pistons.
*  All Wiseco 2 cycle pistons are supplied with rings and circlips.
*  Wiseco 2 cycle pistons are not supplied with a wrist pin unless noted in the description.

The WISECO 644M04900 Dirt Bike Piston is designed for engine rebuilding applications that require an oversize replacement piston. This piston features a 0.039-inch oversize specification, equivalent to the commonly referenced 1.00 mm oversize designation, allowing it to be used with a properly machined cylinder during a rebuild. Its application is intended for dirt bike engines, but exact vehicle and engine compatibility should be confirmed before ordering.
Installation should be performed by a qualified technician using the manufacturer’s service procedures and the appropriate piston-to-cylinder clearance specifications. The cylinder must be professionally measured and machined to match the piston, and all related components should be inspected before assembly. Proper ring placement, wrist pin installation, circlip seating, lubrication, and break-in procedures are essential for dependable engine operation. Do not install the piston without verifying the required clearances and application details.
The WISECO 644M04900 provides a focused replacement solution for restoring compression and supporting a complete top-end rebuild. It is supplied as an individual unit, making it suitable for customers replacing a worn or damaged piston during scheduled maintenance or engine repair. Because piston designs can vary by engine family, compare the part number, oversize requirement, and manufacturer specifications with the original application before installation. Use only compatible rings, pins, clips, gaskets, and other top-end components recommended for the specific engine.
Feature: WISECO replacement piston engineered for dirt bike engine rebuild applications.
Feature: 0.039-inch oversize specification for use with a correctly machined cylinder.
Feature: Individual piston supplied under part number 644M04900.
Feature: Supports top-end service, compression restoration, and performance maintenance when matched to the correct engine application.
Feature: Requires professional measurement, cylinder preparation, and installation according to applicable service specifications.

Features:

• WISECO replacement piston engineered for dirt bike engine rebuild applications.

• 0.039-inch oversize specification for use with a correctly machined cylinder.

• Individual piston supplied under part number 644M04900.

• Supports top-end service, compression restoration, and performance maintenance when matched to the correct engine application.

• Requires professional measurement, cylinder preparation, and installation according to applicable service specifications.