Complete high-performance exhaust hardware replacement kit engineered to secure expansion chambers and prevent exhaust leaks at the cylinder spigot. Includes heavy-duty, high-temperature exhaust springs and matching high-grade sealing O-rings designed to withstand extreme thermal stress and heavy vibration under aggressive high-revving two-stroke riding conditions.
Specs & Details
- Manufacturer Part Number: 78-1097
- Alternative Part Number: FMF 011319
- Kit Type: Exhaust Spring and O-Ring Maintenance Kit
- Application: Pipe-to-cylinder connection seal and retention
Two-Stroke Vehicle Fitment
| Make | Model | Engine Type | Year Range |
| Yamaha | YZ 125 | Two-Stroke Motocross / Off-Road | 1999–2021 |
TSO Garage Note
An inexpensive insurance policy against exhaust leaks, lost pipes, and doused cylinder spigots on high-revving YZ125s. Constant vibration and extreme heat cook out factory rubber O-rings and stretch springs over time, leading to oily spooge leaking down your cases and lost expansion chamber pressure. Keeping a fresh FMF kit on hand ensures a tight seal and locks your exhaust securely in place.
