420898044 Timing Cam Chain for Sea-Doo Fish 18-170 1630 2025

Timing/Cam Chain for Sea-Doo

This timing/cam chain is a direct-fit replacement for Sea-Doo Fish 18-170 1630 models, cross-referencing OEM part number 420898044, and it keeps camshaft and crankshaft rotation synchronized for proper engine timing.

Overview

This timing/cam chain for Sea-Doo is built to restore precise valve timing on the Rotax 1630 ACE engine used in the Fish 18-170. As a critical internal engine component, the timing/cam chain for Sea-Doo drives the camshaft in sync with the crankshaft so valves open and close at the correct moment. It suits riders and mechanics performing a top-end rebuild or replacing a stretched or worn chain.

Built For Performance

• Constructed as a direct replacement for OEM part number 420898044
• Designed to maintain precise camshaft-to-crankshaft timing
• Built to withstand sustained high-RPM marine engine operation
• Roller-style link design for smooth, quiet chain travel
• Pre-stretched during manufacturing to reduce initial elongation
• Heat-treated steel construction for long service life

Fits These Machines

• for Sea-Doo Fish 18-170 1630, 2025

On-The-Job Use

• Top-end engine rebuilds on the Rotax 1630 ACE platform
• Replacing a stretched or noisy timing chain
• Scheduled maintenance during valve clearance service
• Restoring correct cam timing after engine teardown

Specs At A Glance

Good To Know

Q: Does this chain fit my Sea-Doo Fish 18-170? A: It is designed for the Fish 18-170 1630 across the 2025 model year. Always confirm your engine code and serial number before ordering.

Q: Should I replace the tensioner at the same time? A: Replacing the chain tensioner and guides alongside the chain is commonly recommended during a rebuild. Inspect all related components for wear before reassembly.

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