The Cometic C3811FB is a complete top-end gasket kit featuring a fiber base gasket, designed specifically for modern 250cc and 300cc two-stroke dirt bikes.

Vehicle Fitment
KTM: 250 SX, 250 XC, 300 SX, and 300 XC (2023–2025)
Husqvarna: TC 250 and matching 300 off-road models (2023–2025)
GasGas: MC 250 (2023–2025)

Key Features
Fiber Base Gasket: Built with a high-quality fiber base material for optimal sealing and durability at the cylinder-to-cases interface.
Complete Top-End Set: Includes all necessary O-rings, seals, and gaskets required to rebuild the top end of the engine.
OEM Specification: Precision-engineered to match or exceed factory tolerances for a seamless fit.
High-Temp Materials: Utilizes advanced materials resistant to extreme combustion temperatures and pressures.