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I would like to change the main jet on my xs 400 gs form 135 to 130. At motorcyclescarbs.com I have found a Mikuni main jet with the following designation: M10/14 #130. I assume the M10/14 has to do with the thread of the main jet. Is this the correct thread size for the xs 400 gs ? Also...

Since I purchased the 1980 xs400gs a couple of years ago I noticed carbon fouling ( rich mixture) on both spark plugs. I checked and cleaned the air-filters, checked idle, used hotter spark plugs, etc. Nothing seems to change the condition of the plugs. ( I should add that I replaced the...

Welcome to this site. I am from Germany but came to the USA over 30 years ago. I'm sure you will add considerably to this site. Currently I own an xs400gs ( in addition to a BMW r1200R). I enjoy working on the xs400. My project is to "customize" the bike. ( not a restoration). I will probably...

I can't find one good reason why not to wear a helmet. Provided of course that you obtain the right helmet for yourself. Some helmets are awkward and uncomfortable, especially on long rides. I have, for short rides to the store or downtown, not worn a helmet but definitly on longer rides and...

I have a damaged (hole) in the filter of the petcock. Unable to find a replacement of the filter (I tried Bikerbandit.com and Powersedge.com) I decided to replace the petcock. Since most petcoks do not fit ( the filters are usually round and larger) I will have to make adjustments to the tank...