# 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

## Details

- **Price:** 255.0 AUD
- **Vendor:** Sawley's Auto and Marine
- **Tags:** Sawley’s AAM Used Parts – Sea-Doo Parts | Jet Ski Parts & Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 255.00 AUD | In stock |

## Images

- 420837559 Seadoo Balance Shaft | Genuine Used Part
- 420837559 Seadoo Balance Shaft | Genuine Used Part
- 420837559 Seadoo Balance Shaft | Genuine Used Part
- 420837559 Seadoo Balance Shaft | Genuine Used Part
- 420837559 Seadoo Balance Shaft | Genuine Used Part
- 420837559 Seadoo Balance Shaft | Genuine Used Part
- 420837559 Seadoo Balance Shaft | Genuine Used Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/420837559-seadoo-balance-shaft-genuine-used-part)
> Updated: 2026-07-02