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1982 XS 400, won’t start

Discussion in 'The Garage' started by Caleb, Sep 1, 2019.

  1. Caleb

    Caleb XS400 Member

    554F0DE9-C9CE-43FB-8377-B83D408B25D8.jpeg 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 heritage special as well, if that helps any)
  2. NewHavenMike

    NewHavenMike 1976 XS360C Top Contributor

    Welcome. The manuals are available here for you to read and download. If you intend on really riding the bike on the road safely and have great reliability, and the ability to do roadside diagnosis and repair, then you must read the manuals and study your bike. I recommend buying the physical book so you can handle it when your hands are dirty, and its much easier having all the info right there instead of going back and forth with the phone.

    Most years of the XS400/360 are interchangeable as far as the manual and parts go. The big difference between years would be the carbs, but carbs all share the same basic design features anyways. Carbs have very small parts and soft brass components, use the right tools.

    Its probably a clogged jet inside the carbs, and maintenance.

    If you recently purchased this bike or your uncle finally gave it to you, whatever the case may be, you must inspect the bike 100% and it would be very wise to perform all of the maintenance requirements. Youll need a few metric tools and screwdrivers, a manometer, and a voltmeter. For me, I need an induction timing light. You should have a timing light too, but you have electronic ignition and it shouldnt ever really need adjustment.

    Start with the engine, I would probably start with a compression test if you know nothing about the bike.

    Youll want to clean the carbs and sync them and set the valve clearances. Make sure you have a good battery, Id probably buy a new one if its more than 2 years old. Get it running and do a basic voltage check to be sure you get good charging power and idle voltage. After this, Start it and enjoy.

    This is an older machine and their owners really have to know what theyre doing to enjoy the motorcycle and keep it on the road. You dont take this bike to the dealer to be worked on. Maintenance intervals may be more frequent than modern bikes but its not too demanding, even for me having a points ignition. I enjoy my old machines and the routine maintenance that comes with it.
  3. Caleb

    Caleb XS400 Member

    I’ve got the physical manual, compression is good, we found that out after it shot gas out the plug holes about 5 feet away into my buddies eye. (Testing for spark) I won’t be riding this bike, unfortunately , I have to flip it. Moms... not a chance with the cruiser, I’m stuck with the BWS 50 for now. Working on getting my KLR 250 street legal. Have a TW 200 as well but neither bikes have papers (or titles as you call them in the US)
  4. crib20

    crib20 XS400 New Member

    I assume you know that the fuel is set to prime not "on" (from the picture above).

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