421000076 Crankshaft Assembly for Sea-Doo Speedster 800 1998-1999

Crankshaft Assembly for Sea-Doo

This crankshaft assembly is a direct replacement component for the engine in the Sea-Doo Speedster 800, cross-referencing OEM part number 421000076, and it transfers piston force into rotational power to keep your marine engine running.

Overview

The Crankshaft Assembly for Sea-Doo is a complete rotating core component for the Speedster 800 engine. It converts the up and down motion of the pistons into the rotary power your jet drive needs to move water and push the boat. This crankshaft assembly suits rebuilders and riders restoring a 1998 to 1999 Speedster 800.

Built For Performance

• Direct replacement for OEM part number 421000076
• Machined journals sized for the 800 series two-stroke engine
• Balanced rotating assembly to reduce vibration at speed
• Built to withstand continuous high-RPM marine operation
• Designed as a complete drop-in rotating assembly for rebuilds

Fits These Machines

• for Sea-Doo Speedster 800, 1998-1999

On-The-Job Use

• Engine rebuilds and top-end refresh projects
• Restoring older Speedster 800 jet boats to running condition
• Replacing a scored or seized crank after bearing failure
• Marine repair shops handling 800 series Rotax-style engines

Specs At A Glance

Good To Know

Q: Is this an original Sea-Doo part? A: No, this is an aftermarket crankshaft assembly made to fit Sea-Doo applications as a replacement for OEM 421000076. It is not manufactured or sold by Sea-Doo.

Q: Do I need special tools to install it? A: Crankshaft installation on this engine type typically requires a press and case alignment tools, so professional assembly is recommended for most rebuilders.

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