Site Information

 Loading... Please wait...
  • Image 1

Regulator / Rectifier - Yamaha DS7 RD250/350/400 R5 XS1/2/400/650 TX650


Product Description

Regulator rectifier for many of the 70's Yamaha's with points type ignition. Battery not charging? Might be time to replace your rectifier regulator. Unlike many other units, this is designed to work with lead acid based, gel and lithium batteries. The battery must be fully charged and in perfect working order before installing a new regulator rectifier.

This unit has a very consistent output and runs cooler than the original part due to the modern heat sink. The stable voltage output across the RPM range keeps the battery charged so you can ride with confidence!

All units are tested prior to shipping for quality assurance. Includes industry-leading 1 year warranty.


Dimensions: 68mm length x 80mm width x 25mm height
Mounting bolt spacing: 64mm (Measured center to center)
Replaces Yamaha Part Numbers: 1L9-81910-50-00, 256-81970-11-00, 278-81910-22-00, 278-81970-21-00

Note: This unit replaces the stock regulator and rectifier which were commonly 2 separate units on most early points type ignition systems. We have a 6 pin terminal set and a 3 pin terminal set if you need to replace the stock connections or to adapt this unit to your harness.

Note: Corroded / loose / damaged wiring is a common cause for charging system issues, make sure all connections are clean and secure. If the stock connector is brittle or melted and the terminals are corroded, it's best to replace them before installing the new part. This unit might not mount where the stock part was, check dimensions above.

Note: It is strongly recommended to isolate the charging issue prior to replacing the regulator / rectifier. With a bad battery, stator or wiring issues, a new RR will not charge the battery. A faulty stator or wiring can cause damage to the RR.


5 Pin Plug
3 white wires - Phase input from stator
1 black wire - Ground
1 red wire - Positive

2 Pin Plug
1 green wire - Switched ground from alternator field
1 grey wire - voltage sensing input from ignition switch

Fits Yamaha:

DS7 - 1972
RD250/A/B - 1973-1975
R5 - 1970-1972
RD350/A/B - 1973-1975
RD400C/D/E/F - 1976-1979
XS400/D/E/F - 1977-1979
TX650 - 1973
TX650A - 1974
XS1 - 1970
XS1B - 1971
XS2 - 1972
XS650_2F - 1979
XS650B - 1975
XS650D - 1977
XS650SE - 1978
XS650SE-11 - 1978
XS650SF - 1979
XS650SG - 1980

Other Details

Main Category:
Electrical / Lighting
Sub Category 1:
Charging System
Sub Category 2:
Regulator / Rectifier Combos

Product Reviews

Write Review

This product hasn't received any reviews yet. Be the first to review this product!