SKU:857M06640
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 857M06640 Standard Bore Piston Kit is designed for KTM dirt bike applications requiring dependable replacement engine components. Built by Wiseco, a trusted name in powersports performance, this piston kit supports consistent engine operation and helps restore proper piston performance during an engine rebuild or top-end service.
The standard-bore design is intended for compatible KTM engines that retain the original cylinder bore specification. This makes the Wiseco 857M06640 a practical choice for replacing a worn or damaged piston without automatically requiring cylinder machining for an oversized component. Always confirm fitment against your motorcycle’s year, model, engine specifications, and service requirements before installation.
Supplied as a kit, the Wiseco 857M06640 provides a coordinated piston replacement solution for dirt bike maintenance and performance work. Proper installation should follow the KTM service manual and Wiseco instructions, including inspection of the cylinder, piston clearance, rings, wrist pin, circlips, and related components. Careful preparation and correct break-in procedures help support reliable service life and consistent performance.
Whether used for routine top-end maintenance or a complete engine refresh, this Wiseco standard piston kit is engineered for riders, technicians, and rebuilders seeking a dependable replacement for compatible KTM dirt bikes. Verify all application details before ordering to ensure the kit matches the intended engine configuration.
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