S3 125cc Piston Kit - GasGas Pro 2002 onwards, Beta Rev/Evo 2005 to 2010
Superb quality longlife S3 Racing piston kit to fit:
GasGas Pro 125 - 2002 to present,
Beta Rev3 125 - 2004 to 2009
Beta Evo 125cc - 2009 to 2010
Kit includes piston, rings, gudgeon pin and clips but NOT the small end bearing.
Also listed as suitable replacement piston for the following bikes.
Jotagas 125
TRS 125
Sherco 125 2014 to 2019
Scorpa 125 2015 to 2019
But please check very carefully as the distance from the centre of the gudgeon pin to the edge of the piston may be slightly different so the squish clearance must be checked and the base gasket thickness adjusted to suit.
Piston Sizes
A 53.95mm
B 53.96mm
16mm Gudgeon Pin by 45mm long
Centre of the gudgeon pin to the top edge of the piston 29.7mm
Height to the top edge of the piston 60.7mm
Overall height 63.2mm
Weight including rings, gudgeon pin and C-clips 178 grams
The factory recommended piston to cylinder tolerance for the 125 is 0.04 mm, 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.
AKA, PI-SH-TR125, PI-BE-TR125, PI-GG-TR125, PI-GG-TR125-A, PI-GG-TR125-B, PI-0125-A, PI-0125-B
| Manufacturer | S3 |
|---|---|
| Sherco Part Code | 4908, 6797 |
| Beta Part Code | 25-86121-8, 25-86122-8, 2586122 800 |
| GasGas Part Code | MT120216020, MT120516020 A, MT120516121, MT120216021, MT120210121, MT120216121 B, MT120516122, MT120216022, MT120210122, MT120216122 C, MT120516123, MT120216023, MT120216123 D |
| Scorpa Part Code | 4908, 6797 |
| Year | 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2017 |
| Model | 125 |
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GasGas Pro Cylinder Base GasketsStarting at £3.75
