ATHENA Crankshaft Bearing and Seal Kit for BETA RR 250, RR 300, RX 300, XTRAINER 250, XTRAINER 300 2013-2025

ATHENA offers this engine bearing and seal kit for BETA RR 250, RR 300, RX 300, XTRAINER 250, XTRAINER 300 2013-2025. The crankshaft and gearbox shafts spin on bearings in the cases; oil seals keep the oil in around the shafts.

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 ATHENA?

Athena, founded in 1973 by Giovanni Mancassola near Vicenza and based in Alonte (Italy), designs gaskets, pistons and cylinder kits; it supplies original equipment to manufacturers such as KTM, Ducati, Fantic and Triumph.

When should you replace the bearings on your BETA RR 300?

Unusual vibration, a deep knock that follows engine speed or play in the con-rod: the bottom end needs a rebuild.

The manufacturer publishes no hour interval for this model: have the con-rod play checked at every piston change. Cross-Mania guideline: rebuild the bottom end every 2 to 3 top-end rebuilds.

Specifications and fitting tips

• Manufacturer part number: P400060444001

Spare parts and items to plan

• Complete engine gasket kit : ATHENA · PROX
• Connecting rod kit : PROX · WOSSNER
• Gearbox oil : LIQUI MOLY 10W30 1 L · LIQUI MOLY 1 L

Compatibility

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

Fits:
BETA RR 250 2021
BETA RR 250 2020
BETA RR 250 2019
BETA RR 250 2018
BETA RR 250 2017
BETA RR 250 2016
BETA RR 250 2015
BETA RR 250 2014
BETA RR 250 2013
BETA RR 300 2023
BETA RR 300 2022
BETA RR 300 2021
BETA RR 300 2020
BETA RR 300 2019
BETA RR 300 2018
BETA RR 300 2017
BETA RR 300 2016
BETA RR 300 2015
BETA RR 300 2014
BETA RR 300 2013
BETA RX 300 2025
BETA RX 300 2024
BETA RX 300 2023
BETA RX 300 2022
BETA RX 300 2021
BETA XTRAINER 250 2021
BETA XTRAINER 250 2020
BETA XTRAINER 250 2019
BETA XTRAINER 250 2018
BETA XTRAINER 250 2017
BETA XTRAINER 300 2023
BETA XTRAINER 300 2022
BETA XTRAINER 300 2021
BETA XTRAINER 300 2020
BETA XTRAINER 300 2019
BETA XTRAINER 300 2018
BETA XTRAINER 300 2017
BETA XTRAINER 300 2016
BETA XTRAINER 300 2015