WILLIAMS 325 TurboJet (Rotax)
Technical guide, maintenance and spare parts
The Williams TurboJet 325 is one of the flagship models of Williams Jet Tenders. Designed for yachts from 16 to 21 meters, it combines jet propulsion, a 90 HP BRP Rotax ACE 903 engine and a format that allows for good storage capacity on board.
With its 3.29 m length, 325 kg dry weight and 4+1 person capacity, the TurboJet 325 is a particularly versatile tender for shore excursions, coastal trips and water activities.
This guide presents the main features of the Williams TurboJet 325 as well as maintenance parts, common problems and useful technical resources for its maintenance.
Find parts for your WILLIAMS TurboJet 325
- Engine parts
- Fuel system
- Ignition
- Sensors
- Electrical parts
- Cooling
- Oil and filters
- Gaskets and seals
- Turbine block parts
- Other
Technical specifications of the Williams TurboJet 325
- Overall length: 3.29 m.
- Width: 1.70 m.
- Dry weight: 325 kg.
- Height: 0.94 m.
- Height with removable steering wheel: 0.80 m.
- Engine: BRP Rotax ACE 903 – 90 HP.
- Propulsion: hydrojet.
- Capacity: 4+1 people.
- Fuel tank: 40 liters.
- Maximum speed: up to 77 km/h.
- Recommended yacht: 16 to 21 m.
Specifications may vary depending on the year, configuration and equipment. This article concerns the Rotax engine version, not the older versions with a different engine. Confirm the specifications with your tender's documentation.
The engine belongs to the same family as that of the Williams MiniJet 280, rated at 60 hp, but with a different power configuration (90hp). See the technical guide for the Rotax ACE 903 engine to find engine information and associated references. The same engine family does not guarantee the interchangeability of all parts.
How often should the WILLIAMS TurboJet 325 be maintained?
Regular maintenance: the table below shows the maintenance schedule provided for this tender range according to the WILLIAMS documentation.
| Frequency | Maintenance to perform | By |
|---|---|---|
| After every use at sea | Flush the exhaust system | User |
| Every 10 hours at sea | Engine corrosion protection | User |
| Every month (2 weeks at sea) | Sacrificial anode check | User / Workshop |
| 50 hours or 1 year | Oil change + oil filter + general check of engine, cooling, fuel, electrical, steering and propulsion | Workshop |
| 100 hours or 1 year | Oil change + filter + periodic checks + lubrication | Workshop |
| 100 hours | Replace the power take-off (PTO) boot | Workshop |
| 200 hours or 2 years | Coolant + spark plugs + thorough cleaning/checks | Workshop |
| 200 hours | PTO sleeve + seal and propeller shaft seal/sleeve | Workshop |
Common parts for the WILLIAMS TurboJet 325
Click on a thumbnail to add one unit of the product to the cart, then access the cart to complete your order. On a computer, hover over the thumbnail to display "Buy" followed by the part name. The names and references open the product sheets. This selection is based on the TurboJet 325 applications listed in our sheets, generally from 2019 for the Rotax versions; the limits specific to each sheet remain to be checked. Compare the OEM reference, the year and the fitment before ordering. OEM references identify replacement parts and do not mean that every product is an OEM original part.
Common Problems with the WILLIAMS TurboJet 325
The symptoms below may affect several components or systems. These are possible causes, not a diagnosis or troubleshooting guide.
- The engine does not start: battery, electrical connections, fuses, relays, or starter. If the starter normally turns the engine without starting, the areas to check include fuel supply, ignition, and electronic management: fuel pump, injectors, coils, spark plugs, or sensors. A fault code can guide the diagnosis.
- Engine misfires: ignition, fuel supply, or engine management. Vibrations can also originate from the propulsion unit; the turbine, wear ring, drive shaft, and associated components should be checked depending on the symptom.
- Lack of power: ignition, injection, fuel supply, engine management, or propulsion unit. Look for a possible fault code and check maintenance items before replacing components.
- Display of a fault code: the electronic system of the Rotax ACE 903 monitors various parameters and may record an anomaly. A fault code alone is not enough to confirm that a particular part needs to be replaced. Overheating may be related to the cooling circuit, an obstruction, or a water circulation problem; in case of a persistent alert, stop the engine and look for the cause before continuing use.
To learn more about fault codes, see our Rotax fault code list for Sea-Doo and Williams and our guide to decode Rotax fault codes on Sea-Doo and Williams.
How to identify the right part for your TurboJet 325?
Can't find your part number? Send us a clear photo, its OEM part number when visible, the model and year of your Williams, as well as any available information about the engine. We can help you identify the right replacement part.
You can also use our part recognition tool by clicking:
WILLIAMS TurboJet 325: Frequently Asked Questions - FAQ
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What engine is equipped on the Williams TurboJet 325?
The Williams TurboJet 325 presented here is equipped with a BRP Rotax ACE 903 engine with 90 HP.
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What is the power of the Williams TurboJet 325?
The version described produces 90 HP thanks to its Rotax ACE 903 engine.
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What is the maximum speed of the Williams TurboJet 325?
The stated maximum speed can reach 77 km/h, depending on the configuration and operating conditions.
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How much does a Williams TurboJet 325 weigh?
The stated dry weight for the described configuration is 325 kg. It may vary depending on the model year and equipment.
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How many people can ride in a TurboJet 325?
The TurboJet 325 described is configured for 4+1 people. Respect the capacity indications of your boat.
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What is the fuel tank capacity of the TurboJet 325?
The stated fuel capacity is 40 liters.
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What spark plugs does the Williams TurboJet 325 use?
The Rotax ACE 903 engine equipping the Williams 325 TurboJet uses NGK CR8EB type spark plugs. Always check the part number corresponding to your engine before replacement. Our set of 3 CR8EB compatible spark plugs is described as a high-performance generic alternative.
What oil should be used in a Williams TurboJet 325?Use an oil that meets the specifications recommended by BRP for the Rotax ACE 903 engine, checking the application of BRP XPS 4T 5W-40 to your model year. Follow your boat's maintenance recommendations. For other engines, consult the Rotax 1503 and Rotax 1630 guides without automatically applying their recommendations.
- How often should a Williams TurboJet 325 be serviced?First service after break-in: confirm its due date in the documentation corresponding to your model year. The following intervals: depend on the boat's operating hours and the date of the last service. The table provided above includes interventions at 50, 100, and 200 hours or according to the corresponding calendar intervals.
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Why won't my Williams TurboJet 325 start?
Possible causes include a low battery, an electrical problem, a faulty relay or fuse, an ignition problem, or insufficient fuel supply. (FMT)
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Why is my TurboJet 325 losing power?
Possible causes include an ignition, injection, fuel supply, engine management, or propulsion unit problem. (FMT)
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Why is my TurboJet 325 overheating?
An obstruction or defect in the cooling circuit can cause overheating. Water intakes, hoses, and the cooling system should be checked. In case of a persistent alert, stop the engine and look for the cause before continuing use. Also see our guide dedicated to overheating. (FMT)
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Why is my TurboJet 325 vibrating?
A vibration can originate from the engine or the propulsion unit. The propeller, wear ring, drive shaft, and propulsion components should be checked in particular. The propulsion unit can suck in a foreign object (piece of wood, rope, fishing line, rocks, orange sports buoy...), resulting in a loss of propulsion and/or strong boat vibrations. (FMT)
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How to diagnose a fault code on a TurboJet 325?
The fault code helps guide the diagnosis toward the affected system, without proving on its own that a part is defective. See our Rotax error code guide to identify the codes and their meanings. (FMT)
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Is the engine of the TurboJet 325 the same as that of the MiniJet 280?
Both described models use an engine from the Rotax ACE 903 family, but the MiniJet 280 is rated at 60 hp, while the TurboJet 325 presented here uses a 90 HP configuration.
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Are the parts of the MiniJet 280 compatible with the TurboJet 325?
Some engine parts may be common when the OEM part numbers and assemblies match, but the two models are not entirely interchangeable. Differences may exist notably on the transmission, stuffing box, propulsion unit, and steering elements, such as control and steering cables. Check the part number of each part before ordering. However, apart from the hull, upholstery, and tubular frame, all parts of the Williams 285 and Williams 325 from the same model year are interchangeable.
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Where to buy parts for the Williams TurboJet 325?
Rotax Tender Parts offers maintenance and replacement parts for Rotax engines and various components used on Williams boats. Browse the product table above and compare the OEM part number of your original component to confirm compatibility.
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