xs 400

Hello everyone. I have read through a couple of the other threads about the XS400 not starting, but I can't seems to find anything that helps my situation. The PO said that it used to run fine until the carbs starting leaking. He put a new set of carbs on it and tried making it into a bobber and...

Sorry I actually cant figure out what this is exactly. I think its the breaker from what I have read in the manual but at least for the SOHC manual, it doesn't look like it. Anyways, Im putting the engine back together and this is the last thing I think I might have to time correctly? I didnt...

Been troubleshooting an oil leak and finally just installed the battery again. Pulled the choke fully out as its about 30 degrees out and I don't remember the noise being there. It was idling at I think 2-3k, I don't know for sure and then at some point I heard it drop in RPM to around 1.5k...

So my bikes push rod is leaking and I am having a hard time finding a place to buy its seal and bushing. Could anyone help me find a place to buy it? MikesXs just has the XS650s seal and bushing and I dont know if they will work with a XS400

Hey XS’ers. I’ve read a few threads on some similar issues from others, but I’m not quite finding the answers I need. I’ve got a 1979 XS400f that I am turning into a brat style. I’ve done a lot of upgrades, including the motogadget M unit blue, motogadget gauges, and a solid state...

Hey folks, I am new to the xs world but picked up an 81 400 to bastardize for use at Mad Max events because I read you can add a kick start to it (my pull start Predator 212 powered CB500 wasn’t cutting it in the desert) because I want the back up and reliability of a mechanical starting...

my bike is a 1978 xs400 but it has some odd quirks it came stock with front and back caliper brakes, wind shield and rear storage but the vin number says it is a base model and it has no special badging any ideas of what’s up with this?

Hey guys, I'm pretty new to this forum and this is my first resto project on a 1980 XS 400. I am ecstatic to find this collaborative site and thought I'd pick your brains regarding the wiring I'm planning to do on my bike. I see that there are other threads with the M-unit blue, but I'm...

I recently picked up a 78 xs400 barn find For 300$. It has 250 original Miles on it but its been sitting since 1991, overall the bike is in fantastic shape, a mouse chewed on the seat a little. Little rust on the pipes and the tires are toast... the previous owner drained all the gas even the...

Had it running, backfiring like crazy. Won’t run. New gas, tried the carb adjustment on the bottom but I really don’t know what these carbs are the aren’t the ones in the Manual I have. Kinda lost. Any advice? I’m a teenager and am completely new to this so any advice would be great. (It’s a...

A few months ago I purchased a 1977 Yamaha xs360. The bike was in a very rough condition when I bought it so i spent these last months rebuilding nearly everything. I'm running stock-ish (not open) exhausts and the original carbs with pod filters. I replaced the #130 main jet with a #135 to...

Hey guys, having issues with my 1982 Yamaha XS400, I believe it is a Maxim. When I first got her she wasn't running and was making a clicking noise when I tried to start it. Found the ignition fuse loose and she was up and running. It's been about 4 months, I've made a couple of upgrades but...

I've oficially given up on my project, Burnadette, as it's been at an impasse for too long and I'm making room for more feasable projects (within my current skillset that is). Basically one and a half XS, two front ends, two engines, one modified frame, and a bunch of the rest. Oh and ofcourse...

Hi guys, new member here, first bike I've ever owned. Bought this bike for $400 off craigslist about a month ago. It was running on one carb, so I took them out and gave them a thorough cleaning while replacing the float valves and needles. Put the carbs back in last week, fed them some gas...

1980 xs400,

Hi guys new to the forums here. Just got what I believe is a 84 xs400 and am having issues with the charging system. Looking for advice on where to start and how to go through to figure out which component is not working. So far I have ohm'd out the stator and all three coils are identical which...

So after cleaning and rebuilding my carb I started putting it back together and when trying to screw the float bowls back in 7 put of the 8 screw holes on the carb turned out to be stripped. If you look at the pictures they are the screw holes that attach the float bowl to the carb itself. The...

So after cleaning and rebuilding my carb I started putting it back together and when trying to screw the float bowls back in 7 put of the 8 screw holes on the carb turned out to be stripped. If you look at the pictures they are the screw holes that attach the float bowl to the carb itself. The...

Hi guys I just picked up a 82 xs400 and I had no problems cleaning out the carbs but one of the floats had a little dent and I'm assuming gas had leaked inside the float I need to replace it but I'm not sure what the part number is are the floats for these pretty much interchangeable or do I...

Hello all, Currently my bike (82' XS400 Maxim) is running great but I want to put air pods on instead of the stock air box/filter. Everything is stock - including my exhaust. What jets should I order? If anyone has done this or knows what I should do, your help would be appreciated! (Also...