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Looking for a set of carbs for my 78 xs400. I don’t care about the condition as long as they aren’t damaged. Looking to change out the aftermarket ones I have now.

Anyone interested in purchasing a brand new set of 400 carbs from mikes? Shoot me a message.

78 xs400 2e Anyone know where to buy gaskets that go to the part of the exhaust that goes into the heads themselves. Looks like they come in two pieces. Also are there other gaskets there too? seems like there should be a second gasket to make up some of the space between those split gaskets...

1978 Yamaha XS-400 2E SOHC I took my motor apart several months ago and finally had the chance to work on it today. It's been so long that when I went to put my valve cover on I forgot where to put the bolts. I have several that are the same length, two that are longer than all the rest and...

My 78 Xs400-2e needed a new motor. So I pulled apart the spare one and the original one to make a nice new motor for the old girl. I tried looking in some old threads and the manual. Ive had no luck finding the torque specs on the acorn nuts holding the cylinder head to the block. The manual...

My 78 xs400-2e has a seized motor. Any suggestions on getting the chain off the sprocket on the camshaft, without breaking it? I would like to re-use the head on my motor and just replace the bottom end. The sprocket bolts are line up at 2 o'clock and 8 o'clock so I was able to get the top bolt...

Looking to buy a 77-79 xs400-2e motor. If you have one for sale please let me know. Thank you.

Has anyone replaced a clutch in a 78 xs400-2e? Any tricks or tips? Also is there anywhere i can buy a full assembly?

1978 xs400-2e sohc, took head off to do head gasket put the motor back together started and ran but once I hit the throttle itd sputter and backfire. Cleaned carbs well thinking that was the issue put them back on and bike still did the same thing so I decided to check the timing. Lined up LF...

Just wondering if anyones actually converted a kick start only motor to an electric start motor? Im lazy, kicking it all the time gets exhausting lol. I really don't mind but am getting fidgety and looking to do something. I searched the forum a bit but i didn't really find anything, which is...

my 78 xs400-2e behind the battery is a big metal rectangle. Is that a relay of some sort? its ringing like a school bell, and it wont stop. what is this for and does this mean i need a new one?

So, im in need of some help here. I have a 78 xs400-2e, and I snapped the spark plug on my lefthand side, removing it took an unrepairable amount of the head along with it. Long story short I had to replace the head with one from a 77 model xs400. Using the manual I put it all back together, and...

Hey guys in the middle of my rebuild I wanted to change the plugs seeing as they probably my having been changed since the early 80's, my right side plug snapped flush with the motor it took a torch and an easy out to remove it unfortunately the head cracked in the process. Long story short...

The title explains it, I live in Massachusetts anyone I'm or around the area with a good head from a 78 xs400 2e I would like to buy it. If you have one and need to ship it just let me know what your price is and the shipping cost

any one have a good condition oil screen for a 78 xs400? or know where to buy one new? if theres anyone in or near massachusetts with one in good condition please let me know thanks!

Finishing up my project 78 xs400, decided today would be a good day to replace spark plugs since the last time they were changed was probably sometime back in the mid 80's! Started on the right side no problem, remove and replaced easily. Onto the left side....snap! Barely any pressure and the...

If im reading the online manual right for my bike, its saying theres an oil filter and an oil filter screen. Am I reading this correctly or is there only the screen? If theres a filter as well, where is it? Im in the middle of a rebuild so while its still dirty, Id like to get the oil change...

Anyone know where I can get replacement rubbers for where the tank slides into the frame? Or any links to ideas on how to make some myself?

Checked several threads and I can't find one with pictures. If someone could post a few pics of the petcock vacuum line and where it goes to on the carbs it would be greatly appreciated. It's a 1978 xs400, I must've plugged one of the lines into the wrong port because I don't see anywhere to...

Hey everyone, I'm new to the forum and I tried searching through most of the articles before posting my own thread. I have a 78 xs 400, it's been a project of mine for a while. The previous owner started to take it apart and lost a few things. I have two questions for anyone who can answer them...