Description
A properly assembled top end is the foundation of reliable 4-stroke performance, and the WSM Top End Kit eliminates guesswork by delivering factory-quality components in one package. Whether you’re rebuilding after high-mileage wear or refreshing your Honda 420 for peak power output, this kit provides everything necessary for a complete, correct assembly without trips to multiple suppliers. Trust proven components engineered to OEM specifications so you can focus on what matters—reliable performance on the track or trail.
- Complete piston assembly
- Compression rings included
- Wrist pins & clips
- Needle roller bearings
- Head gasket set
- Base gasket included
- Intake manifold gasket
- Exhaust gasket
- Oil filter
- 4-stroke models only
- Honda 420 fitment
- MPN: 54-231-20
