WILLIAMS 395 SportJet
Technical Guide, Maintenance and Spare Parts
The Williams SportJet 395 is a sport jet tender designed for yachts 20 meters and larger.
More spacious than the SportJet 345, it can accommodate up to 6+1 people, while retaining the performance and handling characteristic of the SportJet range.
It is equipped with the 90 HP BRP Rotax ACE 903, a four-stroke three-cylinder engine also used on several other Williams Jet Tenders.
With its 3.90 m length, 50-liter tank and a top speed of up to 74 km/h, the SportJet 395 is equally suited for transfers between the yacht and the shore as for coastal outings and water activities.
This guide presents the main features of the Williams SportJet 395, its Rotax engine, common maintenance parts and the main points to check in case of a problem.
Find parts for your WILLIAMS SportJet 395
- Engine parts
- Fuel system
- Ignition
- Sensors
- Electrical parts
- Cooling
- Oil and filters
- Gaskets and seals
- Impeller block parts
- Other
Technical specifications of the Williams SportJet 395
- Overall length: 3.90 m.
- Width: 1.77 m.
- Dry weight: 390 kg.
- Height: 0.94 m.
- Low configuration height: 0.85 m.
- Engine: BRP Rotax ACE 903 – 90 HP.
- Propulsion: jet.
- Capacity: 6+1 people.
- Fuel tank: 50 liters.
- Maximum speed: up to 74 km/h (46 mph).
- Recommended yacht: 20 m and larger.
Specifications may vary slightly depending on the year, equipment and tender configuration.
The 90 HP BRP Rotax ACE 903 also equips the TurboJet 285 and TurboJet 325 presented in our guides. Some maintenance parts may be common when OEM references and fitments match. The same engine family does not guarantee the interchangeability of all components. See our complete Rotax ACE 903 engine guide.
How often to maintain the WILLIAMS SportJet 395?
The program below uses the same maintenance schedule as that kept for the SportJet 345 and the TurboJet 285 or 325. Check its applicability to your model year and configuration in the WILLIAMS documentation.
| Frequency | Maintenance to perform | By |
|---|---|---|
| After every use at sea | Exhaust system flushing | 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, steering and propulsion | Workshop |
| 100 hours or 1 year | Oil change + filter + periodic checks + lubrication | Workshop |
| 100 hours | Power Take-Off (PTO) boot replacement | Workshop |
| 200 hours or 2 years | Coolant + spark plugs + thorough cleaning/checks | Workshop |
| 200 hours | PTO sleeve + seal and propeller shaft seal/sleeve | Workshop |
In a marine environment, regularly monitor the engine oil, oil filter, spark plugs, fuel system, cooling, battery, electrical connections, anti-corrosion protection, steering, propulsion block and anodes.
The SportJet 395 has an engine flushing point. After use in salt water, flushing and corrosion protection contribute to the longevity of the engine and its components. Follow the WILLIAMS and Rotax procedure corresponding to your tender; our engine flushing guide complements these recommendations without replacing the model manual.
Common parts of the WILLIAMS SportJet 395
This selection is an overview of the compatible parts available on www.rotaxtenderparts.com. OEM references serve as a starting point to determine the corresponding aftermarket reference. Click on a "Buy" thumbnail to add one unit of the product to the cart and access the cart. When several versions require a choice, the "Choose the version" thumbnail opens the product sheet. The names and references retain their links to the product sheets.
The iNR connector only concerns tenders equipped with this option.
Common Problems with the WILLIAMS SportJet 395
The following symptoms can have several causes. These clues guide inspections but do not constitute a diagnosis or an indication of automatic part replacement. Work on fuel, moving parts, and electrical circuits must be carried out safely, according to the manual, and by a professional when necessary.
- The engine does not start: check the battery voltage, electrical connections, battery disconnect switch, kill switch cable, fuses, relays, fuel supply, fuel pump, spark plugs, coils, and any fault codes. A battery capable of powering accessories may not provide sufficient voltage during starting.
- Engine misfires: ignition components, fuel supply, sensors, and electrical connections are among the clues to examine. A targeted inspection helps avoid replacing parts at random.
- The engine starts but lacks power: insufficient fuel supply, clogged filter, incorrect fuel pressure, faulty injector, spark plug, or coil, engine sensor, cooling, electronic limitation, or propulsion block. Reading fault codes can guide the diagnosis.
- Fault code displayed: the electronic system may indicate an anomaly and limit engine performance. A code indicates a detected fault, not necessarily a defective part.
- The engine overheats: check the water supply, cooling circuit, hoses, any obstructions, temperature sensors, and exhaust system. Stop the engine in case of a persistent warning and find the cause before continuing use. After use in salt water, perform the flush according to the manufacturer's recommendations.
- The SportJet 395 lacks thrust: the engine is not necessarily at fault. Have the intake screen, propulsion block, internal propeller, and forward / reverse system inspected. Ingested algae, ropes, plastic bags, or other debris can significantly reduce performance. Stop the engine and prevent any restart before inspection; do not attempt to clear the water intake while the engine is running.
Consult our Rotax fault code guide to identify recorded faults and guide inspections. (FMT)
How to identify the right part for your SportJet 395?
Send us a clear photo of the part, its OEM reference when visible, the model, year, and engine identification information. Specify the presence of options such as iNR for the components concerned. We can help you identify a suitable replacement part.
You can also use our tool: Identify my part from a photo.
SportJet 395 or TurboJet 325?
The Williams SportJet 395 and TurboJet 325 described here both use the 90 HP Rotax ACE 903, but their designs differ.
| Feature | TurboJet 325 | SportJet 395 |
|---|---|---|
| Length | 3.29 m | 3.90 m |
| Engine | Rotax ACE 903 – 90 HP | Rotax ACE 903 – 90 HP |
| Capacity | 4+1 people | 6+1 people |
| Fuel tank | 40 L | 50 L |
| Top speed | 77 km/h | 74 km/h |
| Yacht type | 16–21 m | 20 m and more |
The TurboJet 325 prioritizes compact format and performance, while the SportJet 395 adopts a configuration more oriented towards water sports and onboard comfort. The SportJet notably features a rear platform facilitating access to the water and equipment intended for water sports. Consult our Williams TurboJet 325 guide.
WILLIAMS SportJet 395: Frequently Asked Questions - FAQ
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What engine is equipped on the Williams SportJet 395?
The SportJet 395 presented here is equipped with a BRP Rotax ACE 903 producing 90 HP.
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What is the engine displacement of the SportJet 395?
The Rotax ACE 903 is a three-cylinder four-stroke engine of approximately 899 cm³.
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What spark plugs does the Williams SportJet 395 use?
The Rotax ACE 903 engine equipping the Williams SportJet 395 uses NGK CR8EB type spark plugs. Always check the reference corresponding to your engine before replacement. Our set of 3 compatible CR8EB spark plugs is described as a high-performance generic alternative.
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What oil should be used in a Williams SportJet 395?
Use an oil compliant with the specifications recommended by BRP for the Rotax ACE 903 engine, checking the application of BRP XPS 4T 5W-40 to your year. Follow your personal watercraft's maintenance recommendations. For other engines, consult the Rotax 1503 and Rotax 1630 guides without automatically applying their recommendations.
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How often should a Williams SportJet 395 be maintained?
First service after break-in: confirm its due date in the documentation corresponding to your year. The following intervals depend on the personal watercraft's hours and the date of the last maintenance. The table kept above notably provides for interventions at 50, 100 and 200 hours or according to the corresponding calendar intervals.
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Does the SportJet 395 have a propeller?
It does not have a conventional external propeller. It uses jet propulsion, with an internal propeller integrated into the turbine block.
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Can the SportJet 395 be used for water skiing?
Yes, it is designed to allow water activities and can receive a suitable tow system. Check the installed equipment and the manufacturer's instructions before use.
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How to flush a Williams SportJet 395?
The SportJet 395 has an engine flush point. Follow the WILLIAMS and Rotax instructions specific to your model, notably the order of operations and the water supply, to avoid improper water circulation. Consult our Rotax engine flush guide in addition to the manual.
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Why does my SportJet 395 not start?
A weak battery, a relay, fuse, kill switch, fuel pump, ignition, engine sensor, or electrical circuit problem may be the cause. An accurate diagnosis is recommended before replacing a part. (FMT)
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