420837559 Seadoo Balance Shaft | Genuine Used Part

🔧 Product Description

Genuine Sea-Doo Balance Shaft Ass'y - Part Number: 420837559

This genuine Sea-Doo balance shaft assembly is used in the crankshaft, pistons and balance shaft assembly on Sea-Doo 4-TEC engines. It counterbalances engine vibration and helps the Rotax 3-cylinder engine run smoothly.

⚙️ Key Features

• Genuine Sea-Doo balance shaft assembly

• OEM part number 420837559

• Factory engine balance shaft component

• Related earlier references include 290837555 and 420837555

• Direct-fit OEM shaft for listed Sea-Doo 4-TEC engine assemblies

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 420837559 → Related to 420837555

• 420837555 → Related to 290837555

• 290837555 (earlier OEM reference)

OEM / Related Numbers:

• 420837559

• 420837555

• 290837555

• 420933442 — related half bushing

• 420933470 — related half-ring

• 420933475 — related half-ring

Aftermarket / Verified Equivalents:

• No aftermarket equivalent

🚤 Compatibility

Commonly used on:

• Sea-Doo Rotax 4-TEC crankshaft, piston and balance shaft assemblies

Typically suits:

• Engine models:

• GTX 4-TEC / GTX LTD / GTX Supercharged — 2002-2006

• RXP 215 — 2004-2010

• RXT 215 — 2005-2010

• GTI 130 / GTI SE 130 — 2006-2018

• GTI SE 155 / GTI LTD 155 — 2006-2018

• GTR 215 / GTR 230 — 2012-2018

• GTX 155 / GTX 215 / GTX 260 — 2007-2018

• RXP-X 255 / RXP-X 260 — 2008-2015

• RXT-X 255 / RXT-X 260 — 2008-2015

• WAKE 155 / WAKE PRO 215 / WAKE PRO 230 — 2006-2018

• Challenger / Sportster / Speedster 4-TEC engine assemblies

• HP Range: Approximately 130HP - 260HP

• Engine Type: Sea-Doo Rotax 1503 4-TEC Crankshaft / Balance Shaft Assembly

• Year Range: Approximately 2002 - 2018

🔌 Function

The balance shaft reduces vibration from the three-cylinder engine layout by counteracting rotating and reciprocating forces inside the engine.

Common signs of failure:

• Increased engine vibration

• Bearing or shaft noise

• Metal debris in oil

• Damaged balance shaft gear or surfaces

• Engine vibration after incorrect timing or assembly

📦 Condition

• Genuine used part

• Removed from running engine where applicable

• In good working condition unless otherwise stated