PLN 4,777.50
Available, delivery time: 1-2 weeks
Product "TRIUMPH 765 Racing Alternator Kit 2017+"
Please choose your desired variant, as well as the appropriate accessories for installation and successful operation!
This is a complete, ready-to-install race alternator kit consisting of the rotor, stator, mounting plate and the dedicated regulator/rectifier. The kit is supplied pre-assembled with all necessary connectors.
In short: the significantly lighter rotor with a much smaller radius results in drastically reduced gyroscopic forces acting on the crankshaft. The effect is immense:
- Easier direction changes, especially in quick chicane transitions
- Much faster engine-speed matching when downshifting under braking, resulting in:
- quicker downshifts
- less chassis disturbance, improved rear-end stability
- more time and confidence when turning in
- later braking
- Improved throttle response and faster acceleration
A typical power gain is around 5–6 hp, although this varies slightly from engine to engine.
The kit uses a compact 45 mm rotor weighing only 198 g.
This not only reduces the effective rotating mass on the crankshaft—since the new rotor is 78% lighter than the OEM unit (198 g vs. 890 g)—but more importantly reduces gyroscopic forces thanks to the much smaller radius (45 mm vs. 120 mm). For comparison: at 14,000 rpm the OEM rotor reaches a tangential speed of approx. 320 km/h, while the race rotor spins at only about 120 km/h.
The key performance advantage comes from the fact that a lighter rotor with a smaller radius is far easier to accelerate and decelerate.
Most racing alternators also use a smaller rotor, but typically with far fewer windings. This results in low and inconsistent output, and they still rely on the OEM regulator—which is not designed to handle surplus power at racing rpm and converts it into damaging heat.
Our alternator kits also feature a compact rotor, but we use high-efficiency, fine-gauge copper wire for the windings. This enables us to deliver strong and consistent power from lower speeds (approx. 4000 rpm).
Another key benefit is the intelligent switching system inside our dedicated regulator/rectifier. Once the required voltage is reached, no additional electrical load is generated at the crankshaft. This keeps the regulator significantly cooler and far more reliable. For this reason, never use our race alternator kits with the OEM regulator.
Insbesondere für die besonderen Ansprüche hinsichtlich notwendiger Kapazitätsreserven in Verbindung mit einer Racing Lichtmaschine empfehlen wir den Einsatz einer LiFePo4 Versorgungsbatterie mit mind. 7,5 Ah, besser 10Ah.
When using a racing alternator, we advise against the use of a lithium polymer battery.
To remove the original flywheel, you will need a puller.
Pullers and LiFePO4 batteries are available here in the shop.
Important installation notice
for race generator kits by BDK Race Engineering
A BDK race generator kit replaces your motorcycle’s rotor, stator and regulator/rectifier with a considerably lighter unit designed for racing. The reduction in rotating mass is noticeable – but it requires a clean installation and brings a different operating behaviour with it. Here is what matters most so your kit works reliably from the start.
Who should carry out the installation?
Installation should be performed by an experienced mechanic – someone confident working on both the engine and the electrical system. Specifically, this includes:
- Removing the generator cover, flywheel/rotor, starter clutch and stator, including retaining the rotor key
- Removing and refitting the pick-up sensor while preserving its original position
- Working with thread-locking compound and defined torque values to manufacturer’s specification
- Cleaning gasket surfaces, correctly seating new gaskets and dowels, sealing the cable grommet – and, on liquid-cooled models, draining and refilling the coolant
- Properly crimping the spade terminals and populating the connector block
- Wiring and fusing the regulator/rectifier into the electrical system, plus taking AC and DC measurements with a multimeter
What matters during installation
- Thread lock is mandatory: All bolts are fitted with thread-locking compound and tightened to the specified torque. Failures have occurred where this was omitted – it is the most common avoidable mistake.
- Use only the supplied regulator: The standard regulator must never be run with a race generator. The regulator body must be properly earthed at all times.
- Regulator mounting: on a flat metal surface in the airflow, away from exhaust heat. Bolt one mounting point and secure the other with a cable tie.
- Mind the cable management: Route and secure the stator and pick-up wiring exactly as it left the factory, using the original clamps – free of chafing, with sufficient slack, never trapped. A chafed wire means a short to earth.
- Connections: Every spade terminal must audibly click into place. The order of the three stator wires is irrelevant – a secure fit is what counts.
- Fuse and switched supply: An intact fuse (30 or 35 A depending on the kit) belongs in the positive lead. The signal wire goes to a switched 12 V positive supply so there is no drain when the bike is off.
- Follow the original instructions: Sequence, torque figures, gasket part numbers and cable lengths are model-specific and covered in the enclosed BDK instructions.
What changes in operation
A race generator deliberately produces less charging output than the standard system. Depending on the kit, it only begins charging from around 3,000 to 5,000 rpm; running for longer periods below that will drain the battery. Three rules follow from this:
- Always start with a fully charged battery, use at least 7.8 Ah, better 10.4 Ah LiFePO4 battery.
- After every session, pull the fuse at the regulator, isolate the 12 V supply or use a battery isolator switch – otherwise the battery may be deeply discharged.
- Never start or run the bike with the battery or the regulator disconnected. This will damage the alternator.
The green LED on the regulator indicates that the system is charging – a useful quick check before and after a session.
Diagnostics
The installer should be able to carry out the basic checks independently with a multimeter: fuse and switched supply, continuity between the stator pins (between any two yes, to earth no), the AC voltage across the stator pins at a fixed engine speed, and the charging voltage at the battery. This narrows down almost any irregularity within minutes – often to something minor such as a blown fuse or a spade terminal that never clicked home. The specific target values are listed in the troubleshooting section of the enclosed instructions.
If you are unsure
That is perfectly fine – in that case, have the installation carried out by a specialist workshop or an experienced racing mechanic. If you have technical questions about your kit, we are happy to help; just get in touch.
Please note: This is racing equipment, intended exclusively for racing and track use and not approved for use on public roads. It has been designed with performance in mind over longevity, and – as is customary for racing parts – the manufacturer gives no warranty, guarantee or liability for these items, in particular none for consequential damage. Your statutory rights towards us as the seller remain unaffected. The original BDK Race Engineering installation instructions supplied with the product are authoritative for the installation itself.
Compatibility
| Brand | Model | Years |
|---|---|---|
| Triumph | TRIUMPH 765 (R/RS/Moto2) | 2017-2026 |




















