# 420950820 Sea-Doo Rocker Cover Gasket | Genuine OEM BRP Part

🔧 Product Description

  

Genuine Sea-Doo 1503 / 1630 4-TEC Valve Cover Gasket - Part Number: 420950820

  

A genuine BRP moulded valve/rocker-cover gasket for Sea-Doo 1503 and 1630 Rotax 4-TEC engines. It seals the perimeter of the cylinder-head cover and helps keep engine oil out of the surrounding engine compartment.

  

⚙️ Key Features

  

• Genuine BRP moulded valve-cover gasket

• Correct perimeter shape and bolt-clearance profile

• Oil- and heat-resistant elastomer

• Reusable only if expressly permitted and completely undamaged; replacement is preferred after removal

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 420950820 → supersedes legacy reference 290950820 / 2909508201

• 290950820 and 2909508201 → earlier valve-cover gasket references

  

OEM / Related Numbers:

  

• 420950820

• 290950820

• 2909508201

  

Aftermarket / Verified Equivalents:

  

• No verified direct branded aftermarket equivalent with confirmed BRP sealing profile

  

🚤 Compatibility

  

Commonly used on:

  

• GTI, GTS, GTR and GTX 1503/1630 model families

• RXP, RXT and Wake 1503/1630 model families

• Sportster, Speedster, Challenger, Islandia and Utopia 4-TEC jet boats

• Naturally aspirated and supercharged engines whose cylinder-head diagram specifies 420950820

  

Typically suits:

  

• HP Range: Approximately 130-325 HP across supported 1503/1630 engines

• Engine / Drive Type: Three-cylinder 1503 cc or 1630 cc Rotax 4-TEC/ACE engine

• Year Range: Approximately 2002 onward

• Serial / Model Identification: Confirm the valve-cover casting and engine family. The 900 ACE Spark engine uses a different cover and gasket arrangement.

  

🔌 Function

  

Seals the valve-train cavity to retain lubricating oil and exclude water and debris.

  

Common signs replacement or service is required:

  

• Oil seepage around the valve-cover perimeter

• Burning-oil smell or oil on the exhaust components

• Oil enters the spark-plug wells

• Gasket is hard, torn, swollen or displaced

• Leak begins after valve-clearance, cylinder-head or cover service

  

📦 Condition

  

• Genuine Sea-Doo / BRP OEM part

• Brand new

• Supplied in genuine BRP or equivalent protective packaging

## Details

- **Price:** 64.0 AUD
- **Vendor:** Seadoo
- **Tags:** Sea-Doo Parts | Jet Ski Parts & Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 64.00 AUD | In stock |

## Images

- 420950820 Sea-Doo Rocker Cover Gasket | Genuine OEM BRP Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/420950820-rocker-cover-gasket)
> Updated: 2026-08-01