A brand new aftermarket voltage regulator rectifier for the Kawasaki KZ 550 and KZ 550 LTD, built as a direct replacement for the original unit. It rectifies the alternator output and regulates system voltage, curing the flat batteries, dim lights and unstable charging voltage that follow when the factory regulator breaks down after four decades of service.
Fitting is plug-and-play and direct fit with no assembly required - the single 6-pin plug and the 55 mm mounting hole spacing match the original. A higher grade of electrical components is used than in the original equipment, so the unit runs within specification rather than drifting as it warms up. All products shipped are tested.
Key Features
- Direct replacement to your original unit
- Plug-and-play, direct fit, easy installation
- No assembly required
- Higher grade of electrical components, exceeding OEM equipment quality
- Supplied with the 6-pin connector and wiring
- All products shipped are tested
Technical Specs
| Specification |
Detail |
| Width |
62 mm |
| Length |
85 mm |
| Height |
25 mm |
| Fixation holes (centre to centre) |
55 mm |
| Wire length |
250 mm |
| Number of plugs |
1 |
| Number of pins |
6 |
| Number of wires |
6 |
| Minimum charging voltage |
14.5 V +/- 0.5 V |
| Maximum charging current |
50 A / 500 W |
| Open circuit voltage |
15 V |
| Operating temperature |
-20 to 85 degrees Celsius |
Vehicle Fitment Guide
| Make & Model |
Years |
| Kawasaki KZ 550 (KZ550) |
1980-1983 |
| Kawasaki KZ 550 LTD |
1980-1983 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 21066-1011 |
Kawasaki |
Frequently Asked Questions
Does this unit need modification to fit?
No. It is plug-and-play and direct fit with no assembly required, using a single 6-pin plug and 55 mm mounting hole spacing to match the original unit.
What is included?
The voltage regulator rectifier unit complete with its 6-pin connector and wiring, ready to plug straight in.
How can I tell whether my old regulator has failed?
Start with a fully charged battery and measure across its terminals with the engine running. A healthy charging system holds about 14.5 V plus or minus 0.5 V. If the reading never rises above resting battery voltage, or climbs past 15 V, the regulator rectifier is the usual cause.
Will it fit both the KZ 550 and the KZ 550 LTD?
Yes. The same unit covers the KZ 550 and the KZ 550 LTD across the 1980 to 1983 model years. Confirm the OEM number 21066-1011 on your original part before ordering.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
