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Thread: SR400 misfire

  1. #1
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    SR400 misfire

    Hi SR owners,

    I love long rides out in the country on my SR 400. The engine performs flawlessly when riding along. However I have noticed that now and then when I pull up to a stop, the engine occasionally misfires. It has even cut out a few times but only when coming to a halt. Has anyone else ever had this problem with their SR400?

    Andy

  2. #2
    Senior Member MadMax's Avatar
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    Float height Andy.....

  3. #3
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    I has the EFI version Madmax

  4. #4
    Senior Member gcrank1's Avatar
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    Turn the idle up a tad?
    '81 Yamaha SR500 Caff Racer
    '09 Suzuki TU250X 'The Silent Red Fellow'
    '98 Honda Shadow 750 ACE Deluxe
    In all things maintain your uprightness lest the road reach up and smite thee

  5. #5
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    How do I do that on a EFI model gcrank1?

  6. #6
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    I have something similar. I took off the fueltank to paint and since I got it back on the engine misfires at idle for maybe half a second, sometimes comes back, sometimes shuts off completely. Does not happen too often tho.
    It's a 88 model so not sure if we have the same problem. Perhaps something wrong with the fuel line to the carb? If anyone knows, greatly appreciated.

  7. #7
    Senior Member MadMax's Avatar
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    Quote Originally Posted by Andy24 View Post
    How do I do that on a EFI model gcrank1?
    I think any adjustment on FI models is dealer only Andy, for the sake of a coupe of quid why not try a new plug 1st?

    Quote Originally Posted by robinprins View Post
    I have something similar. I took off the fueltank to paint and since I got it back on the engine misfires at idle for maybe half a second, sometimes comes back, sometimes shuts off completely. Does not happen too often tho.
    It's a 88 model so not sure if we have the same problem. Perhaps something wrong with the fuel line to the carb? If anyone knows, greatly appreciated.
    Check the condition of the fuel and vacuum lines, make sure they're not kinked or pinched, another thing that springs to mind is the inside of the tank got dusty when being prepped for paint and some of that has found its way into the carb, partially blocking the needle valve or pilot jet circuit?

  8. #8
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    Yes I'll fit a new spark plug and see how it goes. Just need the rain to stop now so I can get out on the SR. So much for flaming June☔☔☔

  9. #9
    Senior Member gcrank1's Avatar
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    Not having an EFI SR to look at but an EFI Suz. TU250X I can only say that the Suz. has a cable operated throttle plate on the throttle body and has a 'typical' looking adjustment screw which I tweaked a tad as a too low idle and resultant stall when warm is somewhat common on that model. It is not a very sophisticated EFI system....
    Perhaps NJ-Brett will chime in, he has had both and still has an SR, and had diddled with both.
    '81 Yamaha SR500 Caff Racer
    '09 Suzuki TU250X 'The Silent Red Fellow'
    '98 Honda Shadow 750 ACE Deluxe
    In all things maintain your uprightness lest the road reach up and smite thee

  10. #10
    I also get this sporadically with my '15 with 4k miles. I've never had it cut out all the way though.

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