- New
VERTEX Casted Piston for KTM GS 125, MX 125 1987-1993
€131.90
Tax Included
The piston moves up and down in the cylinder to turn combustion into motion: this kit replaces it along with its rings, pin and clips.
Available in several sizes.
VERTEX offers this piston kit for KTM GS 125, MX 125 1987-1993. 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 KTM 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
- Material: Aluminium
- Piston compression: Standard
- Stroke: 2T
Available in several sizes: choose the one that matches your cylinder (stamped size or measured bore). Diameters: A = 54.19 mm, C = 54.21 mm, D = 54.22 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
- Top-end gasket kit : see the selection
- Spark plug : see the selection
- 2-stroke oil : LIQUI MOLY 1 L 3065 · LIQUI MOLY 1 L 3063
- Air filter : TWIN AIR 154099 · TWIN AIR 154100
Compatibility
Check the exact model and year of your bike in the list below before ordering.
Fits:
KTM GS 125 1992
KTM GS 125 1991
KTM GS 125 1990
KTM GS 125 1989
KTM GS 125 1988
KTM GS 125 1987
KTM MX 125 1993
KTM MX 125 1992
KTM MX 125 1991
KTM MX 125 1990
KTM MX 125 1989
KTM MX 125 1988
KTM MX 125 1987
22293A
2 Items
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The piston moves up and down in the cylinder to turn combustion into motion: this kit replaces it along with its rings, pin and clips.
Available in several sizes.
VERTEX Casted Piston for KTM GS 125, MX 125 1987-1993
€131.90
Tax Included