VERTEX Casted Piston for TM RACING EN 250, ENF 250, MX 250 2000-2019

VERTEX offers this piston kit for TM RACING EN 250, ENF 250, MX 250 2000-2019. The piston slides in the cylinder and takes the force of the air-fuel combustion, passing it to the connecting rod and crankshaft.

Why choose a cast piston?

A cast piston is made by pouring liquid aluminium into a mould: it is what most manufacturers fit as standard, especially on two-strokes.

• High-silicon alloy: it expands little, is fitted with tight clearance and stays quiet when cold.
• Good wear resistance of the skirt and ring grooves.
• Lower price than a forged piston, for OEM quality in normal use.
• Limit: less tolerant of overheating and highly tuned engines.

Why choose VERTEX?

Vertex has made its pistons in Italy since 1953 and has supplied KTM’s original pistons since 1996: molybdenum-disulphide coated skirt and Japanese rings. Its two-stroke pistons are cast from an 18 % silicon alloy.

When should you replace the piston on your TM RACING EN 250?

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

• Material: Aluminium
• Piston compression: Standard
• Rings Quantity: 1
• Stroke: 2T

Available in several sizes: choose the one that matches your cylinder (stamped size or measured bore). Diameters: A = 66.33 mm, B = 66.34 mm, C = 66.35 mm.

Cross-Mania tip: Measure the cylinder bore before ordering: the piston must match your cylinder size. Follow the manufacturer's break-in procedure and replace the top-end gaskets at the same time.

Also needed with this part

• 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:
TM RACING EN 250 2008
TM RACING EN 250 2007
TM RACING EN 250 2006
TM RACING EN 250 2005
TM RACING EN 250 2004
TM RACING EN 250 2003
TM RACING EN 250 2002
TM RACING EN 250 2001
TM RACING EN 250 2000
TM RACING ENF 250 2019
TM RACING ENF 250 2018
TM RACING ENF 250 2017
TM RACING ENF 250 2014
TM RACING ENF 250 2013
TM RACING MX 250 2008
TM RACING MX 250 2007
TM RACING MX 250 2006
TM RACING MX 250 2005
TM RACING MX 250 2004
TM RACING MX 250 2003
TM RACING MX 250 2002
TM RACING MX 250 2001
TM RACING MX 250 2000