|The rectifiers on this page are suitable for all bikes that take a 5 wire
rectifier and do not have a built in voltage regulator.
Consult a repair manual for your bike to see if your bike uses a combination regulator/rectifier.
(See the application chart at the bottom of this page)
The rectifiers on this page are Not for DOHC Honda fours. A combination regulator / rectifier for
the 1979~1983 DOHC Honda 750~1100 can be found on my regulator / rectifier units page.
All the rectifiers on this page are rated at is rated at 55 amps constant use. Most OEM 5
wire rectifiers are only rated at 18 to 22 amps.
|All the rectifiers on this page have 5 wires except where noted.
It mounts on a single 5mm stud, is 48mm square, 40mm thick and comes with
a locknut universal fit rectifier (with enough heat shrink tubing to complete
the job.) The leads are 10" long when sold without a plug; longer leads are
available on special order eMail for a time frame and price on special orders.)
You can use the original plug or order your choice.
This model rectifier is also ideal for the N600 Honda car...
The above rectifier with 5" leads and 8 prong plug for the Honda GL1000 and
the CB750 automatic.
This rectifier comes with a new mating plug for the wiring harness.
R255a rectifier for 1969~1978
SOHC in-line four cylinder Hondas
This part has the same plug as the R255a pictured above and to the right but with 5" wires
inserted into the plug in the proper order for Honda fours. CB350f, CB400f, CB500 four,
CB550, and CB750.
Note: the very early CB500 fours have a pin type terminals in the plug rather than the spade type terminals
like all the other Hondas used. These pin type terminals & plug are no longer available and the best option is
to order a 6PFL plug or the RH-1h repair harness below to go with this rectifier.
Harness repair kit for 1969~1978 Honda Fours.
This is to replace a melted or otherwise damaged plug for where the rectifier plugs into the wiring harness on SOHC Honda
fours. It can also be used to convert the early CB500 with the obsolete pin type plug to take the later rectifier used on all the
other SOHC fours up to the 1978 models.
The RH-1H repair harness comes with a mating plug for the rectifier above and 6" of heavy duty wire color coded to your
bike, 5 wire splices and enough heat shrink tubing seal the connections.
Rectifier for 1970~1977 Suzuki 2 stroke triples
This part has the same plug as the R255a pictured above but with 8"
wires and the proper plug for Suzuki GT triples. GT380, GT550 and
The later GT750 and perhaps the smaller bikes in the GT series had only 4 wires in the plug. Some bean counter at Suzuki must have figured that since
the rectifier grounds through the mounting post, a ground wire was not needed. This rectifier also grounds through the mounting post but I include the
redundant ground wire. Do not worry the original rectifier on your GT only had 4 wires, this one will work on your bike.
The good news is the rest of the wires are in the same place and in the same plug. I install the redundant ground wire on the rectifier and I send along a
ground wire for the plug on the harness at no extra charge
R255a-KZ650 rectifier for early Kawasaki KZ650
from the rectifier is red instead of white. However with the stock part, the white positive lead from the rectifier plugs
into a red wire on the wiring harness so it should be less confusing to connect than the OEM part.
The rectifier for the early KZ400 and KZ750 twins is almost the same but has a slightly different wiring configuration.
Use the button to the right to order this part for the KZ400. R255a-KZ47 $49.00
6 wire Rectifier
triples and Yamaha 2 stroke
twins in mind but will also
work on other bikes that
require a 9 diode rectifier with
a half wave positive output for
the voltage regulator.
The R2-55a6 rectifier is a universal fit 6 wire rectifier like the one at the top of
the page but it has an additional set of diodes for a half wave positive output for
bikes that require this. It is sold in kit form as a universal fit rectifier (with
enough heat shrink tubing to complete the job.) Like the 5 wire rectifiers on this
page the AC inputs wires are Yellow, red is positive and black is negative. The
sixth wire from the 1/2 wave positive section of the rectifier is blue.
Any of the bikes that normally use a 6 wire rectifier like this, can use our 5
wire rectifier when used with our VR3-U or VR3=YRD voltage regulator.
This photo shows a R255a on a customer's GT750
Suzuki café racer.
This photo shows our first R255a rectifier
on a customer's CB750.
|I welcome photos of my parts on customers bikes. Send in your photos and I'll put them up.
|(This is a partial list of the bikes that can use these rectifiers.)
Honda: CB350/4, CB400F Super Sport, CB500, CB550, CB750, GL1000
Yamaha: DS7 and R5 (1969~73), RD250, RD350, RD400, XS1, TX500, TX650, TX750, (early) XS650
Kawasaki: All early fours: Z1, KZ650, KZ900, KZ400 and KZ750 twins, H1 triple
Suzuki: GT380, GT500, GT550, GT750. GS series through 1978, GS400, GS550, GS750
Note: The 2 rectifiers below are for Kawasaki 400 and 650 that have 3 yellow wires from the alternator.
If the stock rectifier on your bike only has 2 yellow wires, you need a unit that has a built in regulator for permanent magnet alternators and this part will not work on your bike.
R255a-Y650T rectifier for early Yamaha 650 twins
This rectifier is for Yamaha 650 twins (XS1, TX650 and XS650) that originally came with a
separate rectifier and voltage regulator. This is a plug and play part for these bikes.
The OEM rectifier had white AC leads but we use yellow for the AC leads on all R255a
series rectifiers so we have added a white band on the AC leads to mark them for Yamaha.
This rectifier is shipped with 5" leads and male plug like the OEM plug but with a locking
tab. If you want to use a locking plug on the wiring harness, see my connectors page for a
Repair Harness for the Yamaha
650 twin rectifier.
The R255a-Y650T rectifier
already comes with a 6 prong
plug for the harness with a set
This option swaps out the
terminals for a repair harness
kit with 5" leads, butt splice
joints and enough heat shrink
tube to seal the repair.