WILLIAMS 285 TurboJet (Rotax)
Parts, maintenance and diagnostics for this tender
Compact and high-performance, the Williams TurboJet 285 is a jet-propelled tender particularly suited to yachts from 12 to 16 metres. In the configuration shown, it is fitted with a 90 hp, four-stroke, three-cylinder BRP
Find parts for your WILLIAMS TurboJet 285
- Engine parts
- Fuel system
- Ignition
- Sensors
- Electrical parts
- Cooling
- Oil and filters
- Gaskets and seals
- Turbine block parts
- Other
TurboJet 285 specifications
- TurboJet 285: BRP Rotax ACE 903 engine, 90 hp, three cylinders, four-stroke.
- Dimensions: 2.90 m long; 1.70 m wide.
- Fuel capacity: 40 litres.
- Capacity: 3 + 1 persons.
- Advertised maximum speed: up to approximately 74 km/h / 46 mph, depending on the configuration and operating conditions.
- Advertised dry weight: approximately 315 kg.
- Typical use: yachts from 12 to 16 m.
Specifications may vary depending on the year, configuration and equipment. This article applies to the Rotax engine version, not older versions fitted with a different engine. Confirm the specifications using 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 (90 hp). See the Rotax ACE 903 engine technical guide for engine information and associated references. Being part of the same engine family does not guarantee that all parts are interchangeable.
How often should the WILLIAMS TurboJet 285 be serviced?
Regular maintenance: the table below shows the maintenance schedule provided for this range of tenders according to the WILLIAMS documentation.
| Frequency | Maintenance to be carried out | By |
|---|---|---|
| After every use at sea | Exhaust system flush | User |
| Every 10 hours at sea | Engine anti-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 system, steering and propulsion | Workshop |
| 100 hours or 1 year | Oil change + filter + periodic checks + lubrication | Workshop |
| 100 hours | Replace PTO bellows | 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 285
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 pages. This selection is based on the TurboJet 285 applications listed in our product pages, generally from 2019 onwards for Rotax versions; the limits specific to each product page should still be checked. Compare the OEM reference, year and 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 285
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 decoding Rotax fault codes on Sea-Doo and Williams.
How to identify the right part for your TurboJet 285?
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 285: Frequently Asked Questions - FAQ
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What engine is equipped on the Williams TurboJet 285?
The Williams TurboJet 285 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 285?
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 285?
The stated maximum speed can reach approximately 74 km/h / 46 mph, depending on the configuration and operating conditions.
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How much does a Williams TurboJet 285 weigh?
The stated dry weight for the described configuration is approximately 315 kg. It may vary depending on the model year and equipment.
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How many people can ride in a TurboJet 285?
The TurboJet 285 described is configured for 3 + 1 people. Respect the capacity indications of your personal watercraft.
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What is the fuel tank capacity of the TurboJet 285?
The stated fuel capacity is 40 liters.
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What spark plugs does the Williams TurboJet 285 use?
The Rotax ACE 903 engine equipping the Williams 285 Turbojet uses NGK CR8EB type spark plugs. Always check the part number corresponding to your engine before replacement. Our set of 3 compatible CR8EB spark plugs is described as a high-performance generic alternative
What oil should be used in a Williams TurboJet 285?Use BRP XPS 4T 5W-40 synthetic oil. . compliant with the specifications recommended by BRP for the Rotax ACE 903 engine and follow the maintenance recommendations corresponding to your model year. This oil is the same for the Rotax 1503 and the Rotax1630
- How often should a Williams TurboJet 285 be serviced?First service after break-in: to be performed between 10 and 25 hours (oil change and oil filter replacement, hose and clamp checks, and general inspection). The following intervals: depend on the number of hours on the personal watercraft 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 285 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 285 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 285 overheating?
An obstruction or defect in the cooling circuit can cause overheating. The water intakes, hoses, and 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 285 vibrating?
A vibration can originate from the engine (rarely) or the propulsion unit (more likely). The propeller, wear ring, drive shaft, and propulsion components should be checked in particular. It is common for the propulsion unit to suck in a foreign object (piece of wood, rope, fishing line, rocks, orange sports buoy...), resulting in a loss of propulsion and/or strong vibrations of the personal watercraft (FMT)
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How to diagnose a fault code on a TurboJet 285?
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 285 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 285 presented here uses a 90 hp configuration.
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Are the parts of the MiniJet 280 compatible with the TurboJet 285?
All engine parts are common, but the two models should not be considered entirely interchangeable, as differences exist, particularly on the transmission, stuffing box, and propulsion unit. Other so-called "steering" elements, such as control and steering cables, are different.
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Where to buy parts for Williams TurboJet 285?
Rotax Tender Parts offers maintenance and replacement parts for Rotax engines and various components used on Williams personal watercraft. Browse the product table above and compare the OEM part number of your original component to confirm compatibility.
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