Aprilia Mojito 50cc....No Spark

Discussion in 'The Workshop' started by Del Sky, Jan 28, 2020.

  1. Del Sky

    Del Sky Active Member

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    Just had a quick look at the Aprilia Mojito, it's a 50cc 2002 model......bought as a non-runner because there is no spark.....not done any testing yet, just checked all the connections.....the odd thing is, when pressing the starter button, the engine won't turn, but the low two stroke oil warning light comes on.....it kicks over o.k so engine is not seized, it must be an electrical fault, but what ?......any thoughts welcomed.
     
  2. Del Sky

    Del Sky Active Member

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    Mmmhhh.............just downloaded the manual for this model.....the low oil warning light is SUPPOSED to come when the starter is pressed, and then go out when the starter button is released, which it does......you learn something every day....
     
  3. scubabiker

    scubabiker NITROJUNKIE

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    7,321
    Flat battery I guess
     
  4. Del Sky

    Del Sky Active Member

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    It's got a fairly well charged battery on it, I borrowed one off a mate until the new one arrives......plus it should start with the kickstart, in theory even with no battery at all...….a closer look tomorrow I think…..
     
    Last edited: Jan 29, 2020
  5. Stevep

    Stevep Well-Known Member

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    5,589
    Earth points, clean everything
     
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  6. Del Sky

    Del Sky Active Member

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    Success !!.....of sorts....we now have a healthy spark, I didn't realise that there was a kill switch on the handlebars......she still won't fire up, so now in the process of removing the annoying plastic, to allow access to the carb. the plug seems like new, but is very dry....I suspect fuel starvation.....
     
  7. scubabiker

    scubabiker NITROJUNKIE

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    Check the hoses, could be a split vacuum hose
     
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  8. Del Sky

    Del Sky Active Member

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    Waiting for a new long reach plug spanner to arrive, as the plug is a bugger to get to.....going to try an old trick that I used to do on one of my Honda Sky's .....apply some drops of petrol into the plughole using a syringe, this somehow pulled the mixture through.....if that don't work then will strip the carb. down, and as scubabiker says, check the vacuum hoses.....
     
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  9. scubabiker

    scubabiker NITROJUNKIE

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    7,321
    Turn the motor over with no plug in before you do that too.
    Just gets rid of all the shit
     
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  10. Del Sky

    Del Sky Active Member

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    That's the Mojito registered in my name, and declared SORN.....might be a silly question, but I wonder if there are any narrower handle bars available for these scooters ?.....those mock ape hangers are way too wide, when the old girl finally sees the light of day, she will have to go down a narrow passage to get to the street, we had a job to get her up the passage to me shed.......
     
  11. scubabiker

    scubabiker NITROJUNKIE

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    I think they are special to the bike. Have a look at the clamp for the stem
     
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  12. Del Sky

    Del Sky Active Member

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    O.k thanks......the only other possibility is maybe I could cut an inch off each end of the bars, and move everything up a bit.....that would at least make them 2" narrower.....
     
    Last edited: Jan 31, 2020
  13. scubabiker

    scubabiker NITROJUNKIE

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    Yeah that could work maybe.
     
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  14. Del Sky

    Del Sky Active Member

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    O.k....So the Mojito now has a full tank of new petrol, carb. stripped down and cleaned, all fuel lines and vacuum pipes checked, it has a brilliant spark, and compression, although not done a compression test yet.....and the little bugger STILL won't fire up....this leads me to believe it can only be two other things, 1. piston or rings, or 2. crank seals, thus not creating ENOUGH compression to drag the fuel up from the tank.....any thoughts welcomed.....
     
  15. Stevep

    Stevep Well-Known Member

    Messages:
    5,589
    only one, compression test
     
  16. Stevep

    Stevep Well-Known Member

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    5,589
    However, after you have cranked it and cranked it and cranked it, is the plug wet or bone dry?
     
  17. Del Sky

    Del Sky Active Member

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    Bone dry Steve.....so fuel not getting through....
     
  18. Stevep

    Stevep Well-Known Member

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    5,589
    compression test then
     
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  19. Del Sky

    Del Sky Active Member

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    Yes I reckon so.....will get my mate to do it.....
     
  20. scubabiker

    scubabiker NITROJUNKIE

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    Reeds?
     
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