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Good Evening. I got my 1964 YA6 running and on the road. I can't seem to be able to stop air in the tube. I rebuilt the pump. New seals etc. Bled the pump. When the bike is running if open up the oil pump and slightly open the throttle I can get oil pumping through with no visible bubbles / gaps. If I let it idle it will eventually start to show air gaps etc. Any thoughts would appreciated, cheers

Thanks Guys! I appreciate the assistance.

I've finally got my YA6 running. Took it for it test run. My transmission shift pattern is Neutral 1, 2, 3, 4 down. Is the correct? It shifts fine. I can't find any documentation about this. Thanks

Yes I am. Located in Vancouver, British Columbia. I got the bike to fire once.. but it seems it's getting flooded. I rebuilt the carb. It's getting spark.. I double checked the timing.. any thoughts would be appreciated. Cheers

Update. I think I have figured it out. After looking at the wiring schematic I thought the only thing that could be stopping it was cranking over / starting is the starting switch located in the voltage regulator. I took the regulator off, cleaned the contacts on the starting switch and reinstalled it. It worked, but no spark. I cleaned the contacts on the points and now I have spark. It wouldn't start, but I think that is a fuel issue. I am off to get some gas. I will update later. Thank you Neo for pointing me in the right direction.

I have an update. I tested the starter button with a circuit tester from the battery and the button (circuit) works. I then jumped the starter directly from the battery to starter (M circuit) and it cranked over, but no spark at the points or spark plug. I then jumped the battery circuit (B) and the common circuit (C) at the ignition switch and the starter button would not work. It almost seems the starting switch within the regulator is not engaging. As previously noted I have replaced the original regulator with a NOS one, but I guess that doesn't mean the starting switch works. Thank you again in advance for any advice / thoughts.

Thank you Neo. I will have a look today. I have also attached the wiring diagrams. Thanks.

Good Morning, I ended up with a 1964 Yamaha YA6 which I have gone through. I went to start and it has no spark. I checked the wiring, changed out the regulator, coil and starter/generator/dynamo. It has lights, signals, horn, brake light which all work, but I can't get a spark. When I pulled the bike apart the white wires (armature circuit) was melted, I fixed that. Otherwise I'm stumped, please help! Cheers