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Starting problem. Xj550 Maxim

Discussion in 'XJ Technical Chat' started by SkyMac, Jul 30, 2019.

  1. SkyMac

    SkyMac New Member

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    Hey, i'm hoping you guys can help me diagnose a starting issue with my 1981 XJ550 Maxim. I'm not very active on here so I apologize if there's a relevant thread I might have missed.

    The problem is when I try to start, the engine turns over and over but never fires. If I walk away and come back in about 20 - 30 minutes, the bike will start, no problem. It starts reliably like this every time. I just have to turn it over, then wait a while and try again, and it'll start. Any ideas?

    New battery. New spark plugs. Rebuilt carbs. Float levels are within spec. New valve shims. I have not vacuum synced the carbs yet.

    Any help is appreciated.
     
    SkyMac, Jul 30, 2019
    #1
  2. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    How long does the bike sit when you notice this problem?
    The fuel bowls are open to atmosphere, so sitting for more than a day or two will require priming the carbs before attempting to start.
     
    k-moe, Jul 30, 2019
    #2
  3. SkyMac

    SkyMac New Member

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    I forgot to mention this only happens after the bike sits overnight. Unfortunately it’s unable to start the first attempt even after priming the carbs. If it’s already been running though, I can shut it off and start it up again within a couple hours no problem.
     
    SkyMac, Jul 30, 2019
    #3

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