The Cometic C3777 Top End Kit is designed for Beta 350 RR and 390 RR four-stroke engines, helping restore dependable sealing throughout the top end while supporting improved low-end power. This kit is manufactured by Cometic and supplied under vendor part number C3777, providing a practical gasket solution for engine rebuilding, maintenance, and performance-focused applications.
The kit includes gasket materials selected for durability, flexibility, and torque retention. Its graphite gaskets feature a steel core laminated on both sides with flexible graphite, while the fiber gaskets are engineered for maximum sealing performance and consistent clamping. O-ring gaskets meet or exceed OEM specifications to support reliable fluid and combustion sealing when properly installed.
Cometic C3777 fits 2011–2017 Beta 350 RR models and 2015–2017 Beta 390 RR models. Confirm the motorcycle model year and engine application before ordering, and follow the manufacturer’s service procedures for surface preparation, torque sequence, and installation. This top end gasket kit is intended for compatible Beta applications and is not a universal-fit component.
Features:
- Performance: Raises compression to support improved low-end power.
- Graphite Gaskets: Feature a steel core laminated on both sides with flexible graphite.
- Fiber Gaskets: Designed for maximum sealing, flexibility, and torque retention.
- O-Ring Gaskets: Meet or exceed OEM specifications.
- Fitment: Fits 2011–2017 Beta 350 RR and 2015–2017 Beta 390 RR models.
- Brand: Cometic.
- Manufacturer Part Number: C3777.
- Vendor Part Number: C3777.
Fitment:
2011 Beta 350 RR
2012 Beta 350 RR
2013 Beta 350 RR
2014 Beta 350 RR
2015 Beta 350 RR
2015 Beta 390 RR
2016 Beta 350 RR
2016 Beta 390 RR
2017 Beta 350 RR
2017 Beta 390 RR
2018 Beta 350 RR
2018 Beta 390 RR
2019 Beta 350 RR
2019 Beta 390 RR