This is a voltage regulator for a 1973 Yamaha RD350. This should help you get that old Yamaha back on the road. This part is obsolete. The part number is 278-81910-22-00 and is shown to fit the following Yamaha products,

1970 R5 ELECTRICAL
1971 R5B ELECTRICAL
1972 DS7 ELECTRICAL
1972 R5C ELECTRICAL
1973 RD250 ELECTRICAL
1973 RD350 ELECTRICAL
1974 RD250A ELECTRICAL
1974 RD350A ELECTRICAL
1975 RD250B ELECTRICAL
1975 RD350B ELECTRICAL

This part may fit other models, so check with your local dealer or mechanic for your specific application.  If you have any questions, please feel free to email or phone.

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Please visit our EBAY Store for lots of new and used parts or call us for any parts you may need but don't see listed. We have a huge selection of Honda Kawasaki Suzuki and Yamaha new and used parts in stock dating back to the early 1970's. 

 Midway Cycle Inc is a full line MC/ATV new and used parts, accessories and service store in Huntsville AL.

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