Wiseco Piston Ring Set 95.00mm (3741XS)

The Wiseco 3741XS is a 4-stroke piston ring set sized for a 95.00mm cylinder bore, supplied per piston with the correct top, second, and oil rings to restore compression, sealing, and oil control on a Wiseco top-end rebuild. Wiseco develops and tests its ring sets specifically for its own forged pistons, so they hold their geometry and seal under race-level heat and RPM.

Specs

• Part number: 3741XS
• Bore size: 95.00mm
• Engine type: 4-stroke
• Quantity: Ring set for one (1) piston
• Brand: Wiseco

Fitment

Confirmed applications for the 95.00mm 3741XS set (running Wiseco pistons):

• Yamaha YZ450F — 2003–2009
• Yamaha WR450F — 2003–2015
• Yamaha YFZ450 — 2004–2009, 2012–2013
• Yamaha YFZ450R — 2009–2020
• Yamaha YFZ450X — 2011
• Yamaha YZ426F — 2000–2002
• Yamaha WR426F — 2000–2002
• Gas Gas EC 450 F — 2013–2015

Match the ring set to your Wiseco piston or top-end kit, or confirm fit with the Year / Make / Model selector above. Multi-cylinder engines require one set per cylinder.

Important compatibility note

These rings fit Wiseco pistons only — they will not work with OEM or other-brand pistons. Suitable for cast iron, Nikasil (nickel-ceramic), boron composite, and Electrofusion bores. Do not run them in chrome-plated bores unless Wiseco specifies otherwise, as this can cause engine damage.