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What carburetors are interchangeable with my 1980 XS400 Special? I'm having trouble finding diaphrams for the Mikuni B34s that are currently installed. I'd rather replace them than try to rebuild them. I honestly don't understand them enough. Has anyone used different carbs and got a good result?

I can't seem to find the slide diaphragms stateside for the Mikuni BS34 carburetors on my 1980 SX400 Special.

Again, I’m brand new to motorcycles. I’m finally at the place where I want to start the bike but I’m not able to. I have spark, decent compression and I’m feeding fuel directly through the fuel inlet on the left carb. As I pour fuel into a container that has a hose with the other end connected...

Forgive me because this is my first ever motorcycle and I'm no Mechanic. I have a 1980 XS400 Special and I tested the ignition coils. According to the Haynes manual, the primary resistance range should be between 3-5 ohms. Mine measure 2.6. The secondary resistance range should be 10.0 and...

I recently came into the possession of a 1980 Yamaha XS400 Special. I changed the oil, cleaned the carbs and attempted to kick start it because the ignition is broken. It looked like someone started the bike with a screwdriver and as a result, it's gnarled up. I ordered a new one today. Did a...