This page is dedicated to Yamaha DS7, R5, RD250, RD2350 and RD400 Two Stroke Twins

This page is still under construction but eventually it will contain everything we make for these bikes as well and technical
information, troubleshooting and pix of part installation and bikes.
Voltage Regulator / Rectifier Unit
Because of customer demand this unit now comes with micro plugs like Yamaha used on the original regulator and rectifier. We supply new plugs
for the harness and highly recommend that you install them as well as replacing the plug from the alternator to the wiring harness since the original
connectors are almost always trashed.
We will supply the VRREM7-YRD with the larger plugs on request.
The leads are the same length as the original regulator and rectifier leads and the unit fits nicely into the place where the original regulator mounted.
$154.00
VRREM7-YRD
Voltage Regulator and Rectifier Set for the R5, DS7, RD250, RD350
This set comes with micro plugs like Yamaha used on the original regulator and rectifier. We supply new plugs for the harness and highly
recommend that you install them as well as replacing the plug from the alternator to the wiring harness since the original connectors are almost
always trashed.
We will supply the this with the larger plugs on request.
The leads are the same length as the original regulator and rectifier leads and mount to the original regulator and rectifier mounts.
$105.00
VRRSET-YRD

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Click here for information on how to install automotive coils on RD series Yamaha twins.

We cannot always make these fast enough to met demand so eMail us to check on stock on hand at sales@OregonMotorcycleParts.com

VRREM3-RD400.
Requires custom mounting but plugs right into the
harness.
$154.00
The pic on the right shows one of these units
custom mounted on a RD400.
Special order only
eMail us to be put on the list for one

VRREM3-RD400 regulator / Rectifier For the RD400 and Daytona Special

Special order only

Regulator and rectifier for the RD400 Yamaha

The most common charing problem on the R5, DS7, RD250 and RD350 is no from failed parts but rather from improper installation
of the brushes. The green wire from the brushes to the voltage regulator is supposed to connect to the one brush on the alternator
and be isolated from ground. These 2 wires are supposed to be sandwiched between 2 insulated washers with insulated tube
covering the bolt. The later models had one top hat shaped washer and one flat one with a larger hole than the bolt size to go over
the shank of the top hat washer.
The low res pic below is a scan from an old Yamaha parts book. The brush connection is circled in red. This is the bes I can to
now to show this. Make sure that neither of these 2 wires touch ground and at least this part will be OK.
Connecting one of our electronic regulators so the field wire (to
the brushes) shorts directly to ground will blow the circuitry in
the regulator.
This is a non warranty repair. We rebuild regulator fried from
improper installation for a $35 rebuild fee...
The best thing is to install it right. The easy way to make sure it
is installed correctly is to check the resistance from the green
wire to ground. Find the green wire where it comes out of the
case and follow it up to where it unplugs from the harness.
Unplug it and test the resistance from it to ground. If all is OK,
the resistance will be in the 3.8 to 4.5 ohm range. If the
resistance is very low or 0, either the brushes are installed
incorrectly or the rotor is blown and in any case will blow your
new regulator...
Electronic Regulator only for DS7, R5, RD250, RD350.
We supply a new plug for the harness and highly recommend that you install it as well as replacing the
plug from the alternator to the wiring harness since the original connectors are almost always trashed.
The 6th wire from the old rectifier is not used with this regulator and this is covered in the instructions.
VR3-YRD
$54.00
Rectifier for DS7, R5, RD250, RD350.
This is a 5 wire rectifier for use with our VR3-YRD voltage regulator only.
We supply a new plug for the harness and highly recommend that you install it as well as replacing the
plug from the alternator to the wiring harness since the original connectors are almost always trashed.
R255a-YRD
$51.00
Rectifier for DS7, R5, RD250, RD350.
This is a 5 wire rectifier for use with our VR3-YRD voltage regulator only.
We supply a new plug for the harness and highly recommend that you install it as well as replacing the plug from the alternator to the
wiring harness since the original connectors are almost always trashed.
R255a-YRD
$57.50
VR4-RD400 Voltage Regulator
This regulator plugs into the stock wiring harness
but requires custom mounting. It's a little longer
than the OEM regulator and will not fit in the stock
location.
$55.00
VR4-RD400
R255a-RD400 Rectifier
This rectifier mounts in the stock location
and plugs right into the wiring harness.
$51.00
R255a-RD400
See article #24 on our FAQ page for diagnostic information about the R5, DS7, RD250 and RD350.

S pecial Order Only