Sherco Top End Engine Rebuild Kit - 125cc - 2000 > 2004
For the Sherco ST125 trials bikes from 2000 to 2004.
Please select the piston and base gasket size required to suit your bike, each bike is different.
|B||55.96mm||M580 or M212B|
|C||55.97mm||M581 or M212C|
|D||55.98mm||M582 or M212D|
The factory recommended piston to cylinder tolerance for the 125 is 0.0175 to 0.0225mm (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.
16mm Gudgeon Pin by mm long
Centre of the gudgeon pin to the top edge of the piston mm
Overall height mm
Weight including rings, gudgeon pin and C-clips grams
The base gaskets are available in different thicknesses to allow the correct squish clearance to be achieved. The standard gasket is 0.5mm thick and is commonly used with one of the thinner shim gasket, some bikes even come from the factory with 3 gaskets.
The factory recommend you set your squish (the gap between the top edge of the piston and the cylinder head) to a minimum of 0.50mm.
|Year||2000, 2001, 2002, 2003, 2004|
Cylinder Replating Service£159.95
Sherco Top End Engine Rebuild Kit - 125cc - 2005 > 2010
Starting at £0.30
Sherco Bottom End Engine Rebuild Kit - 125cc - 1999 to 2010
Starting at £1.39