SBT Engine Rebuild Kit 55-116E for Sea-Doo 300 GTX, RXP-X, RXT-X, GTR-X, Replaces 420892738, 420950772

This is the SBT 55-116E engine rebuild kit for the Sea-Doo 300 supercharged four-stroke, found in the GTX, GTX LTD, RXP-X, RXP-XRS, RXT-X, GTR-X and Fish Pro APEX jet skis. It gathers the bearings, gaskets, timing chain and standard-size piston and ring sets for a full bottom-end and top-end refresh. Use it when the engine is coming apart for a rebuild and you want the wear items in one box, cross-referenced to OEM 420892738 and 420950772.

Fits

• Sea-Doo GTX 300 (2019-2026)
• Sea-Doo GTX LTD 300 (2016-2024)
• Sea-Doo RXP 300 (2019)
• Sea-Doo RXP-X 300 (2016-2023)
• Sea-Doo RXP-X ARS / RXP-X XRS (2020)
• Sea-Doo RXP-XRS 300 (2017-2019, 2021-2022)
• Sea-Doo RXT 300 (2019)
• Sea-Doo RXT 300 XRS / RXT XRS 300 (2018-2021)
• Sea-Doo RXT-X 300 (2016-2023)
• Sea-Doo RXT-X 300 XRS (2020)
• Sea-Doo RXT-X RS 300 (2022)
• Sea-Doo GTR-X 300 / GTR X 300 (2024-2026)
• Sea-Doo Fish Pro APEX 300 (2025)

What's included

• Counter balance shaft bearing set
• Main bearings
• Rod bearings
• Internal gasket kit
• SBT timing chain
• Oil spray nozzles (3)
• Piston and ring sets (3), STD size

Replaces OEM part numbers

420892738 · 420950772

Not sure it fits your ski? Call or text 954-914-6465 with your hull ID (HIN) and we'll confirm before you order.