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  1. Qwervo

    Bent clutch push rod - Worn out housing

    Hi folks, I've posted about this issue in someone else's thread but was thinking it might deserve its own. I own an XS400 L Maxim 1984. I've been living with a manageable oil leak for the past 6000 miles, until I decided to investigate it. The leak is coming from the clutch push rod seal, what...
  2. M

    Please help, I need some gurus to give me direction!!

    I posted about this earlier but I bough a project 79’ 400 that had a screw embedded in the head. I did a top end with a new head and that went fine. Compression went from 90L, 120R to 150 L and R. I went through some issues with the carb but it has been cleaned with a full rebuild (compressed...
  3. M

    New to motorcycles

    Hey y’all, I’ve never owned a bike and I’m buying my first one tomorrow. It’s a 1981 XS400. It was in the process of being restored 10+ years ago and never got finished. As far as I’m aware the engine has been completely rebuilt. The bike is painted. That’s pretty much all I know. I will update...
  4. S

    Newbie, Found this mystery little piece in the engine . . . (THE PLOT THICKENS!)

    Hey everyone! I'm a newbie, both to this forum and to working on engines. And to riding lol. I'd really appreciate any input on this. I made a mistake - I was taking apart the engine on my 1978 XS400 and as I was splitting the crank case, I found this little piece had fallen onto my workbench...
  5. Newscooler12316

    Wrong voltage regulator?

    Hello this is my first post so I hope I'm doing it correctly... I'm having an issue with my charging system I've read the forums but I belive it my be incorrect info for my bike(79 xs400f). The issue I'm having was an over charging issue now that I've replaced my stock regulator with a...
  6. C

    78 Xs400 2e starting issues

    So I got a non running 78 xs400 2e about 6 months ago and been slowly working and learning about it. Got carbs rebuilt, new clutch lever cable, plugs, charged battery, new oil amd filter, cleaned tank amd put fresh gas. The battery needs replaced. It won't charge fully. But, trying to...
  7. P

    1982 tank on 1983 xs400R?

    Hey all, Recently i purchased a 1983 Xs400r Seca and the tank is absolutely toast. While looking online I found a few 1982 tanks that are in good ish shape and not too expensive. Does anyone know if the 1982 tank will fit on my 1983? Thanks!
  8. Daniel Moulton

    New XS500 member, I hope you'll accept me. Starting frustration

    I know the xs500 is a bit of a downer in the XS line but I cant find a forum for them, so I hope youll accept me. I am working on a 76 XS500 cafe. I picked up the bike up for $100. After a lot of work I tested to see if it would run and I got it running enough to give me the confidence to keep...
  9. R

    Wider rear tire?

    Hello guys, I have a 1981 Yamaha XS400SE and I want to change the sprockets and chain. I read around here that the DOHC models have a offset sprocket to fit a wider rear tire. I am interested in fitting a wider tire and don't really know what sprockets to buy. Do they both need the same...
  10. J

    Spark plug hole stripped/cylinder head removal

    Bought my first xs400 yesterday for my gf to learn to ride on and have been trying to get it run and was taking the spark plugs out and who ever worked on it last time decided that they need to be at 100ft/lbs and on the hole is stripped , I believe the best way would be to take the cylinder...
  11. R

    Front disc upgrade

    Hello guys, glad to know there is a forum dedicated to this bike. I just bought a 81' XS400 SE and would like to change the front rotor and maybe the brake lever and pump as well. It's my first bike and a I'm still learning so sorry for my lack of knowledge. Has anybody done this, and if so...
  12. Fortune

    New member! New bike! New... mechanic?

    New xs400 owner here, my first bike! I'm a bit of a hobbyist mechanic but I've always wanted an old Yamaha, I just love older Japanese bikes. Anyways, the owner was a super nice guy who let go of this bike for $300 and a chicken sandwich (I got the guy fries too for giving me such a killer deal)...
  13. Qwervo

    Lift / stand / lift table advice DOHC

    Hey fellas, I’m planning to do some work on the bike for the first time during the winter. Mostly maintenance, some electric fixes and some upgrades on the handlebar controls. I have a little storage room to work on the bike and the next step is to buy something to lift the bike to work...
  14. J

    1981 XS 400 H Troubleshooting Help

    Hi all, newbie here. Really appreciate the people who've taken the time to assist me so far - got my XS400 started for the first time last night! The backstory...acquired a non-running 81 XS400H as a winter project two weeks ago. I've been going through the forums and following this one in...
  15. anonymosaurus_RXS

    Electrical Video

    Hey y'all. Not sure if this has been posted before but I found this video by Yamaha thats all about electronics, specifically motorcycles. if you're like me and never gave a shit about this in school, but are fascinated by it now, this is for you. likewise, if you want some clarification on...
  16. Sodakrunner

    Need Help! Front brake kit?

    Hello new to this forum and recently bought a xs400 it runs and drives quite well but has no front brake! I need everything from the lever to the line to the caliper to the router. was wondering if they made some kind of universal kit with a more modern components that I could fab to fit my...
  17. blaketots

    XS360: Oil on right cylinder spark plug

    Hey y'all! I have an all-stock 1977 XS360 that is having power issues on the right cylinder that is causing idle issues when coming down from speed (dying at stop lights if I don't keep revved up, but easy kick to start back up; erratic idle when warm). The right cylinder runs way colder than...
  18. J

    Question about replacing batteries

    Hey everyone, I'm super new to this forum and super new to the XS400. I recently picked up a 1979 XS400F and the battery is real old, and real dead. I really want to replace it with a maintenance free battery but I can't seem to find one that says it works for the 1979 model. BikeBandit says...
  19. J

    Really struggling here...

    Hey guys, having trouble getting my bike to run smoothly, or at all. Some back story... Ive got a 77 xs360 with Mikuni BS38's. ive owned the bike for about two years and done fairly minor work on it, mostly just cafeing it. I usually commute about 10 minutes to work on it and never have any...
  20. A

    HELP - Right cylinder not advancing...

    Hey guys. So I just bought a XS 400 SECA from 1983. When I bought the bike it hesitated in the mid-range acceleration. I figured that it was just a carb adjustment. But no! After checking the spark plugs I found that the right sparkplug was very sooty (running rich) and the left was perfect...
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