Description

This complete 3-piston kit for the supercharged Sea-Doo Rotax 1503 4-TEC includes three pistons, their rings, the pins, and the circlips for rebuilding all three cylinders. Two versions are available: standard size (STD) or oversize +0.5 mm. Each version contains a complete kit for three cylinders, not a single piston.

Designed for the 215, 255, and 260 hp applications specified below, this set is used when rebuilding or replacing damaged pistons after inspecting the cylinders. OEM part number 420890244 is specified for the standard version; the corresponding part number for the +0.5 mm version is yet to be confirmed.

Technical Specifications

OEM part number: 420890244 for the standard size; OEM part number for the +0.5 mm size is not confirmed.
Manufacturer part number: not provided.
Type: complete 3-piston replacement kit for the supercharged Rotax 1503 4-TEC.
Available sizes: STD or +0.5 mm, depending on the version selected.
Applicable power ratings: 215 / 255 / 260 hp, depending on the model.
Condition: new.
Packaging: 3 pistons with their rings, pins, and circlips in each version.
Weight: previously stated value of 650 g; total kit weight to be confirmed.
Regulated substances: none reported in the data sheet.
Installation: by a qualified mechanic after measuring the bore, checking the clearances, and verifying the assembly specifications.

Compatibility

Declared applications for 215, 255, and 260 hp supercharged Rotax 1503 4-TEC engines. The STD or +0.5 mm size must be chosen after measuring the cylinders. Model compatibility alone does not confirm the correct size for installation.

2007: GTX 215 Wake.
2008: GTX 215, GTX 215 Limited, GTX 215 Wake.
2009: GTX 215, GTX 255 Limited iS.
2010: GTX 215 iS.
2011: GTX 215, GTX 215 iS.
2012–2013: GTR 215, GTX 215.
2014–2015: GTR 215, GTX 215 Limited, GTX 260 Limited iS.
RXP and RXT equipped with the 215/255/260 hp Rotax 1503 4-TEC: model year and part number to be confirmed by VIN.

Other declared applications: Williams 400, 435, 460, and 520 Sportjet with Rotax 1503 engine, subject to verification of the engine version, piston part number, and required size. These applications should not be confused with Rotax 903 or 1630 versions.

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

Why Replace Pistons and Their Rings?

Worn or damaged pistons or rings can cause a loss of compression, abnormal oil consumption, and cylinder deterioration. The cause of overheating or lubrication failure must be investigated before reassembly.

Loss of compression or uneven values between cylinders.
Loss of power or difficult starting.
Blue smoke and excessive oil consumption.
Scratched pistons, broken rings, or damaged ring grooves upon disassembly.

During a rebuild, have the cylinders measured and their wear limits checked before selecting the size. Replacement depends on the condition of the engine and the manufacturer's specifications, not a fixed 50-hour interval.