Description
- Two-stroke pistons are made from 4032 silicium
- Four-stroke pistons are made from 2618 silicium – the same material used to produce Formula 1 pistons
- Both include 3% copper in materials for better heat resistance
- All pistons are forged using a precision heat-treatment process that allows for production tolerances of just .005mm
- Most piston kits are available in A or B sizing
- Forged piston tooling allows for the lightest available product
- Kits include antiwear coated piston, rings, pin and circlips
![Cometic Top End Kit 39mm Bore for Honda [MPN: C7974-EST]](https://www.partskeystone.com/wp-content/uploads/2026/03/cometic-top-end-kit-39mm-bore-for-honda-mpn-c7974-est-njcjknti13287.webp)
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