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Thread: Help needed for a Sporty that’s about to be set in fire....

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    Help needed for a Sporty that’s about to be set in fire....

    One of my region members who is not technical so I am posting for him, has a Sportster and it won’t run properly, won’t rev, the local independent HD shop has had it for weeks and can not find the problem, they have swapped many parts from another bike but nothing has worked, they took it it the local auth HD dealer and they have given up as well.
    I don’t have the exact details of what has been swapped and tested etc but I can get them if needed.
    This bike is my friends only mode of transport, he has missed Kelso and a family members funeral as a result, he’s going crazy.
    I am looking for an expert, either professional or shed fiddler that’s willing to take a look, we can get the bike to you, we just need it fixing.
    Details, 64 reg, 17k , 48.
    Can anyone help?
    Thanks
    Rob



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    Last edited by VTwin Rob; 02-06-2019 at 08:56 PM.
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    Re: Help needed for a Sporty that’s about to be set in fire....

    where is he ?

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    Re: Help needed for a Sporty that’s about to be set in fire....

    Dunstable... we have a trailer so can get the bike moved if needed.
    Central South R13 Rep

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    Re: Help needed for a Sporty that’s about to be set in fire....

    Some more details:
    It starts and idles fine, when revved it'll either stall or spit flames back out of the throttle body.
    The crank sensor has been changed so shouldn't be a timing issue.
    Central South R13 Rep

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    Re: Help needed for a Sporty that’s about to be set in fire....

    Are there any fault codes ?

    Without wishing to be a harbinger of doom, it's not the valve timing is it?
    It's your club, have your say!

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    Re: Help needed for a Sporty that’s about to be set in fire....

    Has it been compression tested?

    Flames back through the throttle body suggests something's not sealing properly.........as in a valve, or as stated above the timing is out, which could be cam timing meaning a valve is slightly open when it should be closed.

    Being that it's an EFi bike, has the fuel mapping been adjusted, or do we assume it's a standard bike with standard pipes and filter etc?

    Any idea too if the ECU had been swapped when at a dealer to see if it was this?
    Darren Thomas
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    Re: Help needed for a Sporty that’s about to be set in fire....

    No error codes.
    Compression tests show all good.
    Could the Valve Timing slip? unlikely I think.
    Fuel pressure check is ok
    Inlet manifold, injectors, sensors all swapped with good bike, still same issue.
    Crank sensor swapped
    wiring between inlet & ecu tested ok
    ECU hasn't been swapped.
    It is a stage 1 bike, don't know if it's be mapped as needed but it was running well and nothing was changed on the bike.
    There have been a few occasions when they thought they'd fixed it only to start it the next day and found the issue was still there.

    Thanks
    Last edited by VTwin Rob; 06-06-2019 at 04:55 PM.
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    Re: Help needed for a Sporty that’s about to be set in fire....

    I think then that the ECU is the only possible culprit left.

    Especially as all the sensors etc have been changed.

    It could be that the ecu has gone wibble although the fact it can be intermittent could be a dry joint / connector at the ecu end.

    However remember that I am an idiot
    It's your club, have your say!

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    Re: Help needed for a Sporty that’s about to be set in fire....

    Has the ignition unit and trigger assembly been changed? If it has been replaced while looking for the problem then i will shut up. If not it sounds familiar to me. The trigger unit can give these symptoms especially if the air gap is wrong (loose rotor?) or failing pick up coil. The ignition unit could be failing and losing the timing/spark. This is a problem that needs hands on and the diagnostic tool thrown in the bin.
    Barrie Reid

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    Re: Help needed for a Sporty that’s about to be set in fire....

    similar thoughts has the plugs been swapped and the ht leads tested for continuity ?

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