Let's start at the beginning. Welcome.
RD400s are great little bikes. pretty fast,handle well for the time and are fun to ride. I have owned and modified a few over the years and am in the middle of creating an RD350 drag bike for fun.
Motogadget make some really nice parts and the M unit is a really trick unit. I have looked at them a few times and always decided to save those pennies for other more essential stuff. Wiring on a bike like an RD is simple enough but the stock system is adequate. If I wire a bike from scratch I like to wire in headlamp relays and an ignition relay and fuses for each circuit. I have used a couple of PC8 fuse panels from Eastern Beaver and I like their Sumitomo waterproof connectors and Panasonic mini relays. Main
You can also get electrical parts from
Motorcycle Terminals, Connectors, and Wiring Accessories and
OEM-Type Bullet & Spade Electrical Connectors for 1960's through 1970's Japanese Vehicles... Bridgestone, Datsun, Hodaka, Honda, Kawasaki, Landcruiser, Suzuki, Tohatsu, VW, & Yamaha
Products for flasher cans and rectifiers and LED bulbs
Oregon Motorcycle Parts Products for regulators/rectifiers and connectors.
Fortunately RD's are easy to work on and still lots of parts available from pipes to carbs to reeds and so on. A great place for parts is Economy Cycle in Winthrop harbor
https://www.economycycle.com/ good people and they sell mainly RD stuff. I just bought a pair of RD400 intake manifolds from John at Economy. Good people.
RD400s are great little bikes. pretty fast,handle well for the time and are fun to ride. I have owned and modified a few over the years and am in the middle of creating an RD350 drag bike for fun.
Motogadget make some really nice parts and the M unit is a really trick unit. I have looked at them a few times and always decided to save those pennies for other more essential stuff. Wiring on a bike like an RD is simple enough but the stock system is adequate. If I wire a bike from scratch I like to wire in headlamp relays and an ignition relay and fuses for each circuit. I have used a couple of PC8 fuse panels from Eastern Beaver and I like their Sumitomo waterproof connectors and Panasonic mini relays. Main
You can also get electrical parts from
Motorcycle Terminals, Connectors, and Wiring Accessories and
OEM-Type Bullet & Spade Electrical Connectors for 1960's through 1970's Japanese Vehicles... Bridgestone, Datsun, Hodaka, Honda, Kawasaki, Landcruiser, Suzuki, Tohatsu, VW, & Yamaha
Products for flasher cans and rectifiers and LED bulbs
Oregon Motorcycle Parts Products for regulators/rectifiers and connectors.
Fortunately RD's are easy to work on and still lots of parts available from pipes to carbs to reeds and so on. A great place for parts is Economy Cycle in Winthrop harbor
https://www.economycycle.com/ good people and they sell mainly RD stuff. I just bought a pair of RD400 intake manifolds from John at Economy. Good people.