Kawasaki KX 85 Piston
When to replace a piston?
A motocross piston needs to be replaced regularly . To be sure you replace it at the right time, it's best to always consult your motorcycle's owner's manual .
If you don't have one and can't find one, know that it varies depending on the use (motocross, enduro, sand only, etc.), the rider's skill level (replacing the piston is an operation that cannot be done regularly), the rider's level (a beginner doesn't use the engine like an elite rider) and the displacement (the more revs the engine can make, the more often the piston will need to be replaced: for example, in motocross, the piston of a 125 will be replaced more often than that of a 250 for the same rider and use).
Note: Don't forget to bring a topping bag!
How to choose the piston?
The choice of piston depends largely on the cylinder! If the cylinder generally wears more slowly, the piston also wears. The piston-cylinder assembly must therefore always be in perfect harmony . To this end, you need to have tools to measure the cylinder of your motorcycle . The original clearance between the piston and the cylinder , for example, must be respected :
- New motorcycle:
- Cylinder bore = 54 mm
- Standard size piston bore (dimension A) = 53.95 mm
- Size to be respected: 54 - 53.95 = 0.05 mm
- After several hours of operation:
- Measured cylinder bore = 54.01 mm
- Piston bore to select = 54.01 - 0.05 = 53.96 mm
- To respect the clearance, you must choose a size B
There are several options, as there are forged or cast pistons, double or single ring, etc. Our advice? If you don't have any particular engine tuning skills, always choose the same type of piston as the original and make sure to respect the clearance!
About the Athena brand:
Athena is a renowned brand in the two-wheel world, both for motocross spare parts and for other disciplines. Initially a gasket manufacturer, it has expanded to produce all types of spare parts and has become known for its high-quality production.
Choosing Athena means having the certainty of having high -end spare parts for your two-wheeler.
Technical data of the Athena Kawasaki KX 85 piston:
- The two-stroke pistons are made of 4032 silicone
- The four-stroke pistons are made of 2618 silicon (the same material used for Formula 1 pistons)
- Contains 3% copper for better heat resistance
- All pistons are forged using a precise heat treatment process that accommodates manufacturing tolerances as low as 0.005mm
- The machining of the forged pistons guarantees maximum lightness
- Kits include piston, rings, wrist pin and circlips
- Size B
