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  1. #1

    Default Sportster shuts off on deceleration. Grounds good, coil new, and battery is charging

    So my sportster shuts down on decel, as in when I'm downshifting. Once I'm stopped and cycle the ignition it turns back on again. This happens intermittently but is frequent enough that it's a safety issue. Grounds seem to be good, coil is new, ignition is a vt-i Twin Tec. Any ideas?

  2. #2
    Senior Member

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    Join Date
    Apr 2013
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    9,195

    Default

    New ignition switch? No loose connections anywhere? Grounds checked with a meter while wiggling same, other connections ditto?

    I would swap ignitions (you can always use a spare ignition since they're consumables, I keep both points and electronic) then see if problem repeats). Always keep spare complete ignition systems handy for any motorcycle you intend to keep. It's like not buying asswipe by the sheet.

  3. #3
    Senior Member

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    "So my sportster shuts down on decel, as in when I'm downshifting..."

    Quote Originally Posted by farmall View Post

    Grounds checked with a meter while wiggling same, other connections ditto?
    A/K/A the "Ford test" where I used to work. Found some weird, intermittent problems with that test... Probably the best place to start looking.

    Also, did this just start happening one day, or the bike's been that way since you got it? Was anything changed on the bike before it started? Is it something that started happening occasionally and is getting worse?

    Float level in carb correct? (Drag cars sometimes can have problems caused by fuel slosh that show up in the burnout box or first gear - when you start back up, does it start cleanly or sputter like clearing extra fuel?)

    Bike have a bank angle switch? If so, maybe remove the bolt and try tipping it forward with the bike running, see if it kills it. Or make a bypass for it and test...

    Just throwing some thoughts and questions for other places to look if "Plan A" doesn't pan out

  4. #4

    Join Date
    May 2015
    Posts
    396

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    It shuts down............. Does it happen like someone shut off a switch, or does it sputter and then die?

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