PROX Crankshaft Bearing Ø17x40x12 - 6203T9C3 for KTM SX 50, SX 50 MINI, HUSQVARNA TC 50, TC 50 MINI and GAS GAS MC 50 2013-2027

PROX offers this engine bearing for KTM SX 50, SX 50 MINI, HUSQVARNA TC 50, TC 50 MINI and GAS GAS MC 50 2013-2027. The engine’s shafts run on ball or roller bearings in the cases. They carry heavy loads at high revs and eventually develop play.

What is this bearing made of?

Races and balls (or rollers) in hardened chrome steel, 100Cr6 type: a very hard steel that withstands the fatigue of millions of engine revolutions.

• Open bearing: unsealed, it is lubricated and cooled by the engine oil; clean oil is its best protection.
• C3 / C4 internal clearance: slightly more clearance than normal for a hot engine’s expansion; always refit the original clearance.
• Limit: it dislikes dust and old oil; running short of oil destroys it within minutes.

Why choose PROX?

ProX uses Koyo or NTN bearings, largely made in Japan in OEM factories, with the original internal clearance (C3 / C4).

When should you replace the bearings?

On competition bikes the main bearings are replaced at every bottom-end rebuild, at the hours recommended by the manufacturer. With the cases open, spin each bearing by hand: the slightest rough spot means it must go.

Specifications and fitting tips

• Packing: by unit
• Manufacturer part number: 23.6203T9C3

Cross-Mania tip: Heat the cases to remove and fit the bearings without forcing them, and replace the oil seals at the same time.

Also needed with this part

• Complete engine gasket kit : MOOSE 822347MSE · MOOSE 811337MSE
• 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 50 2024
GAS GAS MC 50 2023
GAS GAS MC 50 2022
GAS GAS MC 50 2021
HUSQVARNA TC 50 2024
HUSQVARNA TC 50 2023
HUSQVARNA TC 50 2022
HUSQVARNA TC 50 2021
HUSQVARNA TC 50 2020
HUSQVARNA TC 50 2019
HUSQVARNA TC 50 2018
HUSQVARNA TC 50 2017
HUSQVARNA TC 50 MINI 2024
HUSQVARNA TC 50 MINI 2023
HUSQVARNA TC 50 MINI 2022
HUSQVARNA TC 50 MINI 2021
HUSQVARNA TC 50 MINI 2020
HUSQVARNA TC 50 MINI 2019
HUSQVARNA TC 50 MINI 2018
KTM SX 50 2027
KTM SX 50 2026
KTM SX 50 2025
KTM SX 50 2024
KTM SX 50 2023
KTM SX 50 2022
KTM SX 50 2021
KTM SX 50 2020
KTM SX 50 2019
KTM SX 50 2018
KTM SX 50 2017
KTM SX 50 2016
KTM SX 50 2015
KTM SX 50 2014
KTM SX 50 2013
KTM SX 50 MINI 2024
KTM SX 50 MINI 2023
KTM SX 50 MINI 2022
KTM SX 50 MINI 2021
KTM SX 50 MINI 2020
KTM SX 50 MINI 2019
KTM SX 50 MINI 2018
KTM SX 50 MINI 2017
KTM SX 50 MINI 2016
KTM SX 50 MINI 2015
KTM SX 50 MINI 2014
KTM SX 50 MINI 2013