Dual 117/86-tooth sprocket Sea-Doo 420834915 – Rotax 1630 supercharged

Description

This 117/86-tooth double gear, OEM reference 420834915, is a replacement part for the drive mechanism associated with the magneto and starter assembly of the Rotax 1630 supercharged engines listed below. It is used during overhaul after gear inspection. Compatibility is limited to the models indicated and does not extend to the naturally aspirated versions of the Rotax 1630.

Technical Specifications

• OEM reference: 420834915.
• Manufacturer reference: not provided.
• Type: double gear, 117/86 teeth.
• Application: supercharged Rotax 1630 only.
• Material: metal, unspecified alloy.
• Condition: new, replacement part.
• Packaging: 1 double gear; magneto, starter and other elements not included.
• Weight: 1.761 kg, value recorded for the product.
• Regulated substances: no substances of concern declared by the supplier.
• Installation: follow the engine workshop procedure and check the reference, tooth profile and associated drive elements before mounting.

Compatibility – Sea-Doo Jet Ski

Compatible only with 300 hp models with a supercharged Rotax 1630 engine. See our Rotax 1630 engine technical sheet for engine context; this does not replace the part reference check.

• Sea-Doo GTX 300: 2016 to 2022; non-iDF* versions for 2021 and 2022.
• Sea-Doo GTX Limited 300: 2021 with iDF* and 2022 (iDF* configuration not specified for 2022).
• Sea-Doo RXP 300: 2016 to 2020.
• Sea-Doo RXP-X 300: 2021, non-iDF*.
• Sea-Doo RXP RS 300: 2022, non-iDF*.
• Sea-Doo RXT 300: 2016 to 2020.
• Sea-Doo RXT-X 300: 2021 and 2022, non-iDF*.

* iDF stands for “Intelligent Debris Free”: Sea-Doo intelligent anti-debris system allowing a blocked water intake to be cleared using a handlebar control, without getting off the jet ski. “With iDF” designates a vehicle equipped with this system; “non-iDF”, a vehicle that is not equipped with it.

The designations and mentions with or without iDF follow the applications on the supplier sheet. Check the exact fitment for your vehicle; do not extend these indications to other variants, displacements or years.

Compatibility – Williams Annexes

• Williams 520 Sportjet – Rotax 1630: supercharged version only, subject to matching with reference 420834915.

⚠️ Always check your serial number (VIN) and the original OEM reference before ordering to confirm the exact compatibility with your model.

Why Replace the Double Gear?

Damaged teeth or observed wear can disrupt the transmission of motion. A starting failure is not enough to blame this gear: have the entire mechanism checked before replacing the part.

• Chipped, broken teeth or abnormal wear observed during disassembly.
• Unusual mechanical noise during drive requiring a diagnosis.
• Irregular drive or engagement failure after checking the starting circuit.

Take advantage of work on the magneto and starter assembly to inspect the associated gears. No systematic replacement interval is documented; replace the part based on the diagnosis and the manufacturer's instructions.

See Also – Other Parts for Supercharged Versions

These two products concern the supercharging circuit of machines common to this sheet. Check their references and mounting conditions separately; they are not included with the double gear.

Sea-Doo 300 Supercharger – 420893566 / 420893567

Sea-Doo 300 and Williams Intercooler – 276000415 / 276000397