Vertex 125 Piston Kit - Sherco 125 2000>2013, GasGas 125 1997-2001+Edition

Part Number
Grouped product items
Product Name Price Qty
S3/Vertex Replica Sherco 125 Piston Kit Size A
1 in stock
S3/Vertex Replica Sherco 125 Piston kit Size B
1 in stock
Vertex Replica Sherco 125 Piston kit Size C
1 in stock
Vertex Replica Sherco 125 Piston kit Size D
0 in stock - Available to order
Comes supplied with new Piston Rings, Gudgeon Pin and Piston C-Clips

The pistons come in sizes A, B, C & D. Size A is the smallest of the pistons and is usually what the bikes come with from the factory but not always, each letter size up increases the piston diameter by 0.01mm, the size is etched on to the top of the piston.

Sherco part number M212
Fits 125 Shercos from 2000 to 2013

GasGas part number M01410003
Fits: 125 GasGas's from 1997 - 2001 + 125 Edition 2002 - 2004

S3 Part Ref: PI-1040-A, PI-1040-B

Piston Sizes

LetterSizePart number
A 55.95mm M212
B 55.96mm M580 or M212B
C 55.97mm M581 or M212C
D 55.98mm M582 or M212D

The Sherco factory recommended piston to cylinder tolerance for the 125 is 0.0175 to 0.0225 mm (we aim for a more realistic 0.02 to 0.03mm), if you are considering putting the next size up piston in please be aware that your original piston will have worn down and any wear in the cylinder is unlikely to be uniform down the bore so please check the bore size all the way down the cylinder and from left to right as well as front to back, the factory measure the piston and cylinders at 24 degrees C. The piston is measured front to back and 19mm up from the bottom of the skirt, be aware that the pistons are manufacture tapered (larger at the bottom) and oval (larger front to back) to allow for unequal expansion of the piston in use.

More Information
Manufacturer Vertex
Sherco Part Code M212
GasGas Part Code M01410003
Year 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
Model 125
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