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After I first got my 400 it was running on one cylinder, I found out that the vacuum line from the right intake manifold wasn't attached to the petcock. Hooked it back up and it ran well. There's only the one vacuum line from the right side manifold. My question is this; is there supposed to...

I recently picked up this 1980 XS400. It's my first XS400. It has little over 11k miles. The old school seat and drag bars on some 2-3" risers are the only mods on it. I'm not too familiar with bikes (cars and trucks are more my area of expertise), but I know the basics. So I have a little...