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does anybody know for sure if the heads of a 79 will work with a 1981 motor? If so which parts from which bike engine must I retain? thanks be well gil :confused:

Seeking the following items, if you've got em and want to sell em let me know thanks. One main needle (stock) if not two matching aftermarket Idle adjustment screw washer and o-ring Two new float valves (hanging pointed pin) Cafe type handle bar, but with low/small offset Good...

Like title say, I need a cap for a 1981 xs400. Not specific as long as the thread are correct and is suited to this engine, let me know how much, gi :thumbsup:

Looking for a filler cap for a 81 xs400. Does anybody know what other years have the same thread and size that will fit/work? thanks gil

1977 xs400e starter turns over nicely, even starts it every now and then. But kick starter always starts. Compression 115 lbs dry. Spark is not that strong, but when running no issues; spark visible but not what I'm used to seeing. Carbs clean. Needs 2.75 turns on the pilot screws. Stock air...

Hey guys, was reading through the tech manual and saw that the 1981 doesn't have a pilot or idle screw adjustment. Is there a way to alter/manage via jets or other means. If not is there a benefit to replacing the cab with a pre 81 carb. I will tinker later as I put on pods and exhaust. Finally...

Anybody feel that the trouble involved to change rear drum on a 1981 is worth the effort, expense and performance improvements? Rims are alloy not spokes. If so what parts are required? Personally, my guess not worth it on such a small bike, but then again if I was sure why would I be asking...

Hello all, new to the site, but reviewed enough to see that there is a boat load of valuable data here, so thanks and a "atta boy" to you all. My son and I just bought two xs400's, a 1977 for him and a 1981 for myself. Plan was cafe build and that may occur later but for now simple mods and...

Hello all, although new to this site I'm not new to biking nor bike rebuilding. I recently bought two XS400's one 1977 (my son's) and another 1981 that I will ride. We plan on making some slight mods as the 1977 is too mint to alter and the 1981 is simply for riding. Anyhow, we have found this...