Wiseco 553M05550 Dirtbike Forged Piston Kit 55.50mm 1.5mm Oversize

The Wiseco 553M05550 is a high-performance forged dirtbike piston kit engineered for riders demanding maximum power and reliability. With a 55.50mm bore diameter and a 1.5mm oversize specification, this piston is designed for engines that have been bored out beyond the standard factory dimension, requiring cylinder sleeving or re-boring for proper fitment.

Wiseco pistons are forged from a high-silicon aluminum alloy, delivering a superior strength-to-weight ratio compared to cast pistons. The forging process creates a denser grain structure that resists heat and stress under extreme performance conditions, making them ideal for competitive motocross and off-road riding.

Key Features:

• Forged high-silicon aluminum alloy construction for maximum strength and durability
• 55.50mm bore diameter — 1.5mm oversize for re-bored or sleeved cylinders
• Innovative piston skirt design optimized for increased horsepower and torque output
• Complete kit includes: piston, rings, wrist pin, and circlips
• Manufactured to tight tolerances for consistent ring seal and reduced blow-by
• Designed for high-rev two-stroke or four-stroke dirtbike applications

Important: This is an oversize piston. Proper installation requires the cylinder to be professionally bored or sleeved to the matching 55.50mm oversize dimension. Always verify bore size with a precision measuring tool before installation.

Wiseco has been a trusted name in performance pistons for motocross, off-road, and powersports applications for decades, supplying top-level professional race teams and everyday riders alike.