Sherco Top End Engine Rebuild Kit - 300cc - 2014 and 15 Factory Model Only
This is the smaller 78.5mm piston, for the 2014 Sherco Factory 300 and 2015 Sherco Factory 300 only, this bike has a 2mm longer stroke and 0.5mm smaller piston to give exactly 300cc (the standard bike is 294cc).
Please select the piston and base gasket size required to suit your bike, each bike is different.
Piston Sizes
| Letter | Size | Part number |
|---|---|---|
| A | 78.46mm | 1657 |
| B | 78.47mm | 2189 |
| C | 78.48mm | 2193 |
The recommended piston to cylinder tolerance for the 300 is 0.03 to 0.04mm, 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 1.30mm.
| Manufacturer | Sherco |
|---|
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Sherco Bottom End Engine Rebuild Kit - 250, 290 & 300cc - 2011>2022Starting at £1.99