1973 RD350 rectifier regulator replacement

[2t Fan]

I can see so many single unit options. Which one I must go for , something giving better performance and voltage

[Economy Cycle John]

These work great, plug and play.

https://www.economycycle.com/shop/yamaha-rd250350400r5ds6ds7-parts/electrical-ignitions-lighting/electrical-parts-and-related/regulator-rectifiers/yamaha-rd350-rd250-all-regulator-rectifier/

[m in sc]

yup. I've used these work great as long as the rest of the system is ok

[2t Fan]

yup. I've used these work great as long as the rest of the system is ok

How can the rotor fail, due to wear? Another thing is the brush. Anything else which can go wrong?

Thanks John and m in sc

[m in sc]

b ushes can fail as they wear, and the rotor can fail if the winding is shot. should be abut 4 ohms resistance across the slip rings with brushes are off.

[Economy Cycle John]

They also can lose efficiency when they age due to brush dust / grime on the contact rings and corrosion of bullets/connectors, loose connections. Gets dirty in there after a half century and brass connectors oxidize. Some contact cleaner on the rings and replacing old connections can help. I've had bikes come in that would only flash the signals if revved, after some good old-fashioned maintenance and a new harness, they'll flash with just the key on. Often mis-diagnosed as a bad flasher relay. 

AI says

Motorcycle generator connections are crucial for maintaining a reliable electrical system, but they can be prone to oxidation and corrosion over time. This can lead to poor conductivity, voltage drops, or even electrical failures. To prevent these issues, here are some tips:

Inspect Regularly: Check the connections for signs of oxidation or corrosion. Look for discoloration, buildup, or loose connections.

Clean Thoroughly: Use isopropyl alcohol or a contact cleaner to remove any oxidation. A small brush can help with stubborn spots.

Apply Dielectric Grease: After cleaning, apply a thin layer of dielectric grease to protect the connections from moisture and oxidation.

Secure Connections: Ensure all connections are tight and properly seated to avoid arcing or further damage.

Protect from Elements: If possible, shield the generator and its connections from water, dirt, and other contaminants.

[2t Fan]

Thanks for the detailed explanation. will check it out

[axldk6]

I thought my flasher was bad, talked to John @ economy and yup mine only flash when reved up. on my to do list.

[grcamna3]

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