power

So I've been working on a project for about half a year now. I got the bike running a few months ago, just needed to rebuild the carb. I rebuilt the carb, and tried to start the motorcycle. The motorcycle tried to start but didn't. I added some gas, same thing again. It didn't start. Now there's...

Hello. Joined the forum to help out a friend who asked for my help with his 1979 XS400. 1. The bike sat outside for 2 years and even if you supply 12 volts, none of the lights, gauge cluster, or even the starter works. The ignition cylinder is getting 12v and the switch does switch on 12v after...

Hi xs400ers, What are biggest tyres that will fit onto 1978 XS400? Without any mods. and how to get faster?? Currently flat out getting it up over 45mph. Tuned and running smooth but lacks power? What suggestions do you guys have? Without a rebore. I have cleaned the carbs. Cleaned fuel...

Hi everyone, So my 400S needs a new front disk master cylinder, the factory one is just completely buggered. I am considering going aftermarket and I found a lever and cylinder set on amazon that will fit the handle bars, but in the description is says: For 125, 200, 250, 300cc SO does the...