Wiseco Pistons: Yamaha YZ85/LT100/MX100/DT100/YZ100/RT100/AT125/DT125/IT125/MX125


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YZ85 02-2023 Crankcase clearance required for 50mm and larger,

YZ85 02-2023 52.50mm 105cc Big Bore

Waseca MX Pistons
While Wiseco got its start in 2-stroke performance, the Wiseco team has remained at the forefront of powersports performance through
every era and evolution, including the development of high-performance 4-strokes. Today, Wiseco offers a range of forged 4-stroke
pistons covering everything from the casual rider looking for durability to the professional-level racer competing for wins.

Wiseco Pro-Lite
• The Forged 2-stroke piston that started it all
• Great value for reliable fun factor • Refreshed performance from the track to the trail •
Optomizing forging design for strength optimization • Extra lightening operations for enhanced
throttle response • Wrist pin, rings and circlips included

Wiseco GP Series
• Designed for Endurance/High RPM Applications
• Designed with optimized features for long service life and top-end power
• Electra-Coated crown, ring groove and pin bore resists potential wear, combustion heat damages,
and ring micro-welding • ArmorGlife skirt coating reduces friction to optimize performance potential
• Wrist pin, rings and circlips included

Wiseco Racer Elite
Designed for Full-Race Applications
• First 2-stroke piston to be forged with 2000-series alloy, providing greater tensile strength
• ArmorPlating surface treatment on crown, in ring groove and pin bores protext from harmful detonation,
friction wear, and ring micro-welding • ArmorFit skirt coating conforms to the cylinder bore for optimized
fitment, translating to optimized performance • Wrist pin, rings and circlips included

Wiseco Forged Series
Multi-Purpose Riding and Racing
• A complete range of forged pistons engineered for each specific 4-stroke powersports engine
• Convering hundreds of applications across ATV, Dirt Bike, Street, Snowmobile, UTV, V-Twin and more
in a variety of bore size and complression ratio options • Forged material optimizes strength and service
life • Performance enhancing features varied across applicable applications to maximize durability and
power • Wrist pin, rings and circlips included

Wiseco Racer Elite
Designed for Full-Race Applications
• Engineered to be a complete racing piston package to compete at the highest levels
• Industry-first features including asymmetrical skirt, lapped ring and ring groove operation to minimize
operating friction and maximize ring seal for overall improved power
• CNC-machines, billet construction for improved strength to weight ratio
• Rings, circlips, and DLC-coated wrist pin included

Additional information


YZ85 02-2023, LT100/MX100/DT100 ALL, YZ100 76-1983, RT100 90-2000, AT125 72-73/DT12573-81/IT125 80-81/MX125 74-76

Piston Type

ArmorGlide, Pro-Lite, Racer Elite, Standard


47.50mm, 48.00mm, 48.50mm, 49.50mm, 52.50mm, 52.00mm, 53.00mm, 53.50mm, 54.00mm, 51.00mm, 52.00mm, 56.00mm, 56.50mm, 57.00mm, 57.50mm, 58.00mm


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Make Model Year
Yamaha AT125 1972 - 1973
Yamaha DT100
Yamaha DT125 1973 - 1981
Yamaha LT100
Yamaha MX100
Yamaha MX125 1974 - 1976
Yamaha RT100 1990 - 2000
Yamaha YZ 85 2002 - 2023
Yamaha YZ100 1976 - 1983
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