The Cometic C3765 Top End Kit is designed for dependable engine rebuilding and improved low-end performance on compatible Beta two-stroke motorcycles. This gasket kit raises compression to help deliver stronger low-end power while supporting a reliable seal across the cylinder, head, and related top-end components. It is an appropriate replacement solution for riders and technicians servicing a Beta 250 RR, Beta 300 RR, or Beta 300 Xtrainer.
The kit combines Cometic gasket technology with materials selected for sealing performance, flexibility, and torque retention. Graphite gaskets feature a steel core laminated on both sides with flexible graphite, helping maintain a consistent seal under engine heat and pressure. Fiber gaskets are designed for maximum sealing capability, flexibility, and torque retention, while the included O-ring gaskets meet or exceed OEM specifications for dependable fit and service performance.
Fitment includes the 2013–2017 Beta 250 RR (2T), the 2013–2014 Beta 300 RR (2T), and the 2015–2017 Beta 300 Xtrainer. Verify the motorcycle model, year, and engine configuration before installation. Manufactured by Cometic and identified by manufacturer and vendor part number C3765, this top end kit is intended to provide the properly matched gasket components needed for a professional engine service.
Features:
- Compression Improvement: Raises compression to support better low-end power.
- Graphite Gaskets: Feature a steel core laminated on both sides with flexible graphite.
- Fiber Gaskets: Designed for maximum seal performance, flexibility, and torque retention.
- O-Ring Gaskets: Meet or exceed OEM specifications for reliable sealing.
- Fitment: Fits 2013–2017 Beta 250 RR (2T), 2013–2014 Beta 300 RR (2T), and 2015–2017 Beta 300 Xtrainer.
- Brand: Cometic.
- Manufacturer Part Number: C3765.
- Vendor Part Number: C3765.
Fitment:
2013 Beta 250 RR (2T)
2013 Beta 300 RR (2t)
2014 Beta 250 RR (2T)
2014 Beta 300 RR (2t)
2015 Beta 250 RR (2T)
2015 Beta 300 RR (2t)
2015 Beta 300 Xtrainer
2016 Beta 250 RR (2T)
2016 Beta 300 RR (2t)
2016 Beta 300 Xtrainer
2017 Beta 250 RR (2T)
2017 Beta 300 RR (2t)
2017 Beta 300 Xtrainer
2018 Beta 250 RR (2T)
2018 Beta 300 RR (2t)
2018 Beta 300 Xtrainer
2019 Beta 250 RR (2T)
2019 Beta 300 RR (2t)
2019 Beta 300 Xtrainer
2020 Beta 250 RR (2T)
2020 Beta 300 RR (2t)
2020 Beta 300 Xtrainer
2021 Beta 250 RR (2T)
2021 Beta 300 RR (2t)
2021 Beta 300 Xtrainer