Wössner 2 Stroke Piston Ring Ø45.00mm - Semi Keystone 1.0mm for KTM SX 65, HUSQVARNA TC 65 and GAS GAS MC 65 2009-2025

WOSSNER offers this piston ring set for KTM SX 65, HUSQVARNA TC 65 and GAS GAS MC 65 2009-2025. Rings are thin steel bands sitting in the piston grooves. They press against the cylinder wall to hold compression and scrape oil.

Why replace the rings?

The benefits:

• Regain compression and power.
• Reduce oil consumption and smoke.
• A cheap fix when piston and cylinder are still within spec.

Why choose WOSSNER?

Wössner has forged its own pistons since 1994: Molykote-coated skirt to reduce friction and ease running-in, kit supplied complete with rings, pin and clips.

When should you replace the piston rings?

Harder starting, loss of power, blue smoke, oil consumption or a knock when cold: these are the signs of a tired top end.

Recommended hours for a top-end rebuild (manufacturer recommendation for the KTM SX 50/65, Husqvarna TC 50/65 2017-2023):

• Check every 20 h, replace every 80 h.
• KTM SX, Husqvarna TC, GASGAS MC 50/65 since 2024: racing: every 45 h.

Specifications and fitting tips

• Manufacturer part number: RSV4500

Cross-Mania tip: Check the ring end gap in the cylinder before fitting and respect the fitting direction (mark facing up).

Also needed with this part

• Piston : VERTEX · PROX
• Top-end gasket kit : PROX · TECNIUM
• 2-stroke oil : LIQUI MOLY 1 L 3065 · LIQUI MOLY 1 L 3063

Compatibility

Check the exact model and year of your bike in the list below before ordering.

Fits:
GAS GAS MC 65 2025
GAS GAS MC 65 2024
GAS GAS MC 65 2023
GAS GAS MC 65 2022
GAS GAS MC 65 2021
HUSQVARNA TC 65 2023
HUSQVARNA TC 65 2022
HUSQVARNA TC 65 2021
HUSQVARNA TC 65 2020
HUSQVARNA TC 65 2019
HUSQVARNA TC 65 2018
HUSQVARNA TC 65 2017
KTM SX 65 2025
KTM SX 65 2024
KTM SX 65 2023
KTM SX 65 2022
KTM SX 65 2021
KTM SX 65 2020
KTM SX 65 2019
KTM SX 65 2018
KTM SX 65 2017
KTM SX 65 2016
KTM SX 65 2015
KTM SX 65 2014
KTM SX 65 2013
KTM SX 65 2012
KTM SX 65 2011
KTM SX 65 2010
KTM SX 65 2009