Mikey85

Just purchased a 73 SDR and would and like the specs and capacity information. How can I get a copy of an owners manual?

Lorenzo, Fixed the issue with both lights illuminating when operating brakes. I had the headlight ground at the same terminal the brown wire was attached to the terminal block opposite the green wires. Removed the brown wire and grounded the headlight wire to the frame and all is working well. Thanks for your help. Mike

Lorenzo, I removed the brown wire and the brake light works now, however both bulbs illuminate bright. Are both bulbs supposed to illuminate when braking? With the headlight switched on and braking, both bulbs are much dimmer. That brown wire grounded to the frame has been that way since I bought the bike new in 1974, wonder why. Feeling better about the wiring except for both bulbs illuminating upon braking. Your thoughts? Thanks, Mike

Lorenzo, Going to remove the brown wire at the terminal block as you have suggested. I wondered if that might be the problem but remembered it was wired like that before I disassembled the bike. I'll let you know the results soon. Thanks, Mike

Lorenzo, I have correct bulbs installed (6V-4.5W and 12V-18W), checked them with meter and they are both OK. I guess what threw me off on the copy of the circuit you sent me was the front brake switch; my bike only has a rear brake switch. I disconnected the green wire from magneto green wire and applied 6v DC power supply to the rear brake circuit and brake light worked when brake pedal was depress. So what does that mean? Has anyone reviewed my schematic to see if it is correct?

Thanks Lorenzo for your input. My brake light switch operates as you have described. Don't believe the wiring diagram is for my Model 85.

RC, Thanks for your response. The wiring diagram you attached is the most legible one I’ve seen so far, thanks. The brake switch operates as expected; when plunger is depressed the circuit connects and when not depressed it is open. In looking over the M91 diagram, it appears to match my diagram. I am starting to suspect there may be a problem with the green wire coming from the magneto.

Just recently completed restoration of my model 85 Alpina I purchased new back in 1974. Did a lot of dirt bike riding back in the 70s and 80s before it was put into storage for nearly 25 years. Took a lot of photos as I went along so I could get it back original. Engine fired on the forth kick and runs great. Head light and tail light both work as before, however the brake light doesn't function when operating the rear brake pedal. Bulbs and brake switch are new and check out using a volt-ohm meter. Have attached a wiring diagram of how my bike is wired. Could someone please review the diagram and see if I have missed something or wired it incorrectly. Any other suggestions for possible solutions would be appreciated also. Thanks, Mike

My name is Mike. Just recently restored the Bultaco model 85 I purchased new back in 1974.