Wiseco PK1378 56mm Forged Piston Kit 2004-2010 Suzuki RM125

The Wiseco PK1378 is a complete forged piston kit designed for the 2004–2010 Suzuki RM125 two-stroke motocross engine. Featuring an 835M overbore size of 56.00mm, this kit provides a reliable solution for top-end rebuilds or overbore applications where stock displacement has been exceeded through cylinder wear or machining.

Wiseco pistons are manufactured using a forged 4032 aluminum alloy process, delivering superior strength and reduced weight compared to cast alternatives. The tighter grain structure of forged construction resists cracking under the high-RPM, high-heat demands of two-stroke motocross competition.

Kit Includes:

• Forged piston – 56.00mm (835M) bore diameter
• Piston ring set – pre-gapped and ready to install
• Wrist pin (piston pin) – precision ground for correct fit
• Circlips (retainer clips) – securing wrist pin in place

Key Features:

• Forged 4032 aluminum construction for maximum durability
• 56.00mm overbore diameter (835M) — requires cylinder boring to match
• Designed specifically for the Suzuki RM125 two-stroke single-cylinder engine
• Manufactured to OEM-quality tolerances for proper fit and function
• Wiseco's proven two-stroke piston technology trusted by professional and amateur racers

This piston kit is intended for use with a properly bored and honed cylinder. Always verify cylinder bore size before installation. Compatible with 2004, 2005, 2006, 2007, 2008, 2009, and 2010 Suzuki RM125 models.