420890244 Sea-Doo Standard Piston Assembly 99.94mm | Genuine OEM BRP Part

🔧 Product Description

Genuine Sea-Doo 1503 4-TEC Standard Piston Assembly, 99.94 mm - Part Number: 420890244

A genuine BRP standard-size 99.94 mm piston assembly for selected 1503 Rotax 4-TEC engines. The catalogued assembly includes the matched standard piston-ring set but does not include the piston pin or circlips unless separately supplied.

⚙️ Key Features

• Genuine BRP cast/forged production-specification piston

• Standard nominal piston diameter: 99.94 mm

• Matched to the original 1503 cylinder-bore class

• Includes the standard piston-ring set

• Cylinder bore, piston-to-wall clearance and ring end gaps must be measured during engine assembly

📋 Kit / Assembly Contents

• 1 × standard 99.94 mm piston - supplied under assembly 420890244

• 1 × standard piston-ring set - 420890380

• Piston pin - 420216250 - serviced separately and not identified as included

• Piston-pin circlips - 420845580 - serviced separately and not identified as included

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 420890244 - current verified standard-size piston assembly reference

• 420890245 - separate 100.19 mm oversize piston assembly; not a direct substitute without approved cylinder machining

OEM / Related Numbers:

• 420890244

• 420890380

• 420216250

• 420845580

• 420890245 - oversize counterpart

• 420890381 - oversize ring set

Aftermarket / Verified Equivalents:

• Australian Jet Ski Parts: AM4TECSTD standard forged-piston kit family

• Aftermarket 99.94/standard 1503 4-TEC piston kits must be balanced and measured as an engine set

🚤 Compatibility

Commonly used on:

• GTX 4-TEC and GTX Supercharged 1503 models

• RXP 215 and RXT 215 model families

• RXP-X/RXT-X 255 and 260 model families where 420890244 is specified

• Wake Pro 215

• Selected 1503-powered Sportster, Speedster and Challenger jet boats

• Other 1503 4-TEC engines whose crankshaft/piston diagram lists 420890244

Typically suits:

• HP Range: Approximately 155-260 HP across verified piston applications

• Engine / Drive Type: 1503 cc three-cylinder Rotax 4-TEC naturally aspirated or supercharged engine

• Year Range: Approximately 2002-2016, model dependent

• Serial / Model Identification: Confirm the cylinder-bore class, engine identification number and crankshaft/piston diagram. Do not install a standard piston in a worn or machined oversize bore.

🔌 Function

Transfers combustion pressure through the connecting rod to the crankshaft while the ring pack seals compression, controls oil and transfers heat into the cylinder wall.

Common signs replacement or service is required:

• Low compression or excessive crankcase blow-by

• High oil consumption or blue exhaust smoke

• Piston slap, knocking or metallic noise

• Scuffed skirt, collapsed ring lands or seized rings

• Cylinder damage following overheating, detonation or lubrication loss

📦 Condition

• Genuine Sea-Doo / BRP OEM part

• Brand new

• Supplied in genuine BRP or equivalent protective packaging