Crankshaft Main Bearing for Sea-Doo Sport 18-300 1630 2026

Crankshaft Main Bearing for Sea-Doo

This crankshaft main bearing is a replacement engine component that supports the crankshaft inside the 1630 Rotax engine used across Sea-Doo Sport 18-300 models. A crankshaft main bearing helps keep the crank rotating on a stable axis and protects the block from excessive wear and vibration. It is intended for riders and mechanics rebuilding or servicing the 1630 engine on 2026 Sea-Doo Sport 18-300 machines.

Overview

This crankshaft main bearing is a service part for the 1630 engine found in Sea-Doo Sport 18-300 watercraft built for the 2026 model year. The bearing carries radial load from the crankshaft and helps maintain correct alignment inside the crankcase during operation. It is a direct-fit replacement component for rebuilds, refreshes, and routine engine repair on these machines.

Built For Performance

• Built to support radial load on the crankshaft of the 1630 engine
• Precision sizes for proper oil clearance and smooth rotation
• Hardened bearing surfaces for resistance to wear under load
• Designed for the 1630 Rotax engine architecture used in Sea-Doo Sport 18-300
• Sold as a single crankshaft main bearing for rebuild or service work

Fits These Machines

• for Sea-Doo Sport 18-300 1630 (2026)

On-The-Job Use

• Engine rebuilds and bottom-end refreshes on 1630-powered Sea-Doo Sport 18-300
• Replacing worn or out-of-spec main bearings during crankshaft service
• Shop and DIY repair work on Sea-Doo Sport 18-300 watercraft
• Preventive maintenance on high-hour 1630 engines

Specs At A Glance

Good To Know

Q: Do I need to replace all main bearings at once? A: When the engine is apart for a rebuild, it is good practice to replace all main bearings together so wear stays even across the crankshaft. Confirm the correct bearing size against your engine's service data before ordering.

Q: Can I install this without machining the crankcase? A: In most cases this bearing installs as a direct replacement if the crankcase journals are within spec. If the case shows scoring or out-of-round wear, have it checked before assembly.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.