ATHENA Cast Piston for TM RACING EN 125, MX 125 2010-2024

ATHENA offers this piston kit for TM RACING EN 125, MX 125 2010-2024. The piston slides in the cylinder and takes the force of the air-fuel combustion, passing it to the connecting rod and crankshaft.

Why a cast piston?

A cast piston is moulded from a high-silicon aluminium alloy, then machined.

• Low expansion: it runs with a tight clearance, stays quiet when cold and warms up quickly.
• Durability: an excellent choice for a stock engine used for leisure or enduro.
• Price: more affordable than a forged piston.
• Good to know: it copes less well with overheating and extreme revs than a forged one.

Why choose ATHENA?

Athena, the Italian manufacturer founded in 1973, is an original-equipment supplier to manufacturers such as KTM and Ducati: the same standards for your replacement parts.

When should you replace the piston on your TM RACING MX 125?

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

No manufacturer hour figure for this model. Cross-Mania guideline: compression check every 20 h in hard use and every 40 h for leisure.

Specifications and fitting tips

• Engine: 2-stroke
• Manufacturer part numbers: S4C05400023A (A), S4C05400023B (B), S4C05400023C (C), S4C05400023D (D)

Available in several sizes: choose the one that matches your cylinder (stamped size or measured bore). Diameters: A = 53.94 mm, B = 53.95 mm, C = 53.96 mm, D = 53.97 mm.

Spare parts and items to plan

• Piston rings : VERTEX · PROX
• Piston pin : WOSSNER WP032 · WOSSNER CW15
• Piston pin clips : VERTEX
• Top-end gasket kit : VHM SK33000.VITON · VHM SK33000
• Small end needle bearing : NTN
• Coolant : MOTUL 1 L · LIQUI MOLY 1 L
• 2-stroke oil : LIQUI MOLY 1 L · MOTUL 1 L

Compatibility

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

Fits:
TM RACING EN 125 2023
TM RACING EN 125 2022
TM RACING EN 125 2021
TM RACING EN 125 2020
TM RACING EN 125 2019
TM RACING EN 125 2018
TM RACING EN 125 2017
TM RACING EN 125 2016
TM RACING EN 125 2015
TM RACING EN 125 2014
TM RACING EN 125 2013
TM RACING EN 125 2012
TM RACING EN 125 2011
TM RACING EN 125 2010
TM RACING MX 125 2024
TM RACING MX 125 2023
TM RACING MX 125 2022
TM RACING MX 125 2021
TM RACING MX 125 2020
TM RACING MX 125 2019
TM RACING MX 125 2018
TM RACING MX 125 2017
TM RACING MX 125 2016
TM RACING MX 125 2015
TM RACING MX 125 2014
TM RACING MX 125 2013
TM RACING MX 125 2012
TM RACING MX 125 2011
TM RACING MX 125 2010