420851754 Sea-Doo Spark Plug Tube | Genuine OEM BRP Part

🔧 Product Description

Genuine Sea-Doo 1503 / 1630 4-TEC Spark Plug Tube - Part Number: 420851754

A genuine BRP spark-plug pipe/tube used through the cylinder head and valve cover on 1503 and 1630 Rotax 4-TEC engines. It isolates the spark plug and ignition-coil well from engine oil, moisture and the valve-train cavity.

⚙️ Key Features

• Genuine BRP moulded spark-plug tube

• Correct length and sealing profile for the 1503/1630 cylinder head

• Supports and protects the stick ignition coil

• One tube is required per cylinder

• Not the Spark/GTI 90 ACE 900 tube unless the engine diagram specifically lists 420851754

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 420851754 → supersedes 420851751

• 420851751 → follows earlier 711851750 / 420851750 applications

OEM / Related Numbers:

• 420851754

• 420851751

• 420851750

• 711851750

Aftermarket / Verified Equivalents:

• SBT: 46-112-06

• Aftermarket replacement: AM420851751 / AM420851754

🚤 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 420851754

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 cylinder-head and valve-cover diagram. Spark/GTI 90 900 ACE engines use a different tube arrangement.

🔌 Function

Creates an isolated dry well for the spark plug and ignition coil while sealing the tube through the cylinder head and valve-cover area.

Common signs replacement or service is required:

• Engine oil or water collects around the spark plug

• Ignition coil boot swells, arcs or corrodes

• Misfire occurs after water exposure

• Tube is cracked, distorted or loose

• Sealing surfaces leak after valve-cover or cylinder-head work

📦 Condition

• Genuine Sea-Doo / BRP OEM part

• Brand new

• Supplied in genuine BRP or equivalent protective packaging