Sherco Top End Engine Rebuild Kit - 250cc - 2006 to 2010

Part Number
RKTS05250
Grouped product items
Product Name Price Qty
Sherco 250 Piston Kit Size A
1 in stock
£139.95
Sherco 250 Piston Kit Size B
2 in stock
£139.95
Sherco 250 Piston Kit Size C
0 in stock - Available to order
£139.95
Sherco 250 Piston kit Size D
0 in stock - Available to order
£139.95
Sherco Cylinder Base Gasket - Narrow - 0.5mm
42 in stock
£7.32
Sherco Cylinder Base Gasket - Narrow - Shim 0.2mm
1 in stock
£3.24
Sherco Cylinder Base Gasket - Narrow - Shim 0.3mm
5 in stock
£3.24
Sherco Cylinder Base Gasket - Narrow - Shim 0.4mm
2 in stock
£3.48
Sherco Inner Cylinder Head O-Ring Large
96 in stock
£4.77
Sherco Outer Cylinder Head O-Ring Large
112 in stock
£4.98
Sherco Cylinder Head O-Ring For Bolts
308 in stock
£0.69
Cylinder Exhaust Gasket - Sherco 1999 On, Scorpa 2010 On
12 in stock
£4.55
Exhaust O-ring - Sherco 1999>2013, Scorpa 2010>2013
45 in stock
£2.99
Aluminium Flat Seal Crush Washer - M5x9x1
261 in stock
£0.30
Athena 18x22x22 Little End Bearing
9 in stock
£7.20
Top end rebuild kit including the piston, gaskets and O-rings.

For the Sherco ST250 trials bikes from 2006 to 2010. (plus some of the late 2005 bikes).

Also fits the Scorpa SR250 models from 2010 to 2013

Please select the piston and base gasket size required to suit your bike, each bike is different.

Piston Sizes

LetterSizePart number
A 72.75mm M009
B 72.76mm M586
C 72.77mm M587
D 72.78mm M588


The factory recommended piston to cylinder tolerance for the 250 is 0.024 to 0.035mm, 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.

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.

We recommend you set your squish (the gap between the top edge of the piston and the cylinder head) to around 1.10mm.

More Information
Manufacturer Sherco
Year 2005, 2006, 2007, 2008, 2009, 2010
Model 250
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