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Help Megelli Build

Discussion in 'Megelli 250cc' started by Kieren Horn, Apr 12, 2019.

  1. Kieren Horn

    Kieren Horn MariosUncle

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    hey guys, pretty new around here but just gonna start a thread for some issues I’m having and trying to see if people have some advice

    So I picked a 250s up fairly cheap off gumtree was told it had the usual issues of a motorbike that hasn’t been looked after etc dirty carby, bad fuel and so on

    Was told it will idle al day fine and free rev but once it was riding under load it would spit and splutter and eventually cut out, so initially I thought it was the carby so I pulled it apart cleaned it put it back together, then pulled the fuel tank tap off and then found out the tank was full of dirt, rust and all other sort of contaminants that definitely shouldn’t be in a fuel tank.
    So I was starting to think that may be the issue?

    That the fuel tap being blocked wouldn’t allow enough fuel to be fed into the carby to allow it to accelerate properly? And that on idle it would allow enough fuel through to idle fine.

    Any opinions would be great!!

    Ps did an acid clean on the tank had a mind blank left the fuel tap on and now it’s liquid... so if anyone knows the specs for the fuel tap that would be mint
     
  2. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

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    Welcome Kieren.
    Your guess about the blocked fuel tap would be correct.
    Can you fit a fuel tap from another bike if you cannot get the genuine one.
     
  3. Kieren Horn

    Kieren Horn MariosUncle

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    Would you happen to know thread sizes? I’m struggling
     
  4. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

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    Risky has a couple, he may be able to help with size.
     
  5. risky

    risky risky

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    block off the vacuum line and buy a cheap on off fuel tap that fits a pit bike. will get the verniers out later today.

    the original vacuum one gave trouble so that was the importers solution
     
    Last edited by a moderator: Apr 12, 2019
  6. Kieren Horn

    Kieren Horn MariosUncle

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    Would this do the trick?
     

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  7. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Those 50cc fuel tap's have an inside diameter around 3mm.
    There are pit bike fuel tap's up to 5mm inside diameter

    Post a picture of your tap and where it fit's to the tank, thread size and or bolt pattern too
     
    Last edited: Apr 12, 2019
  8. risky

    risky risky

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    the thread od is 16mm measured across the width of the thread and is metric.that should give you a guide and yes your picture is what was used to replace the original vacuum type.
     
  9. risky

    risky risky

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    used another vernier calipr and it said 15.4 mm.both calipers are chinese so i suggest the thread iinnr is 15 mm. my67xr- pit bike thread on your bikes?
     
  10. Kieren Horn

    Kieren Horn MariosUncle

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    So 16mm is the size we’re going with?
     
  11. risky

    risky risky

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    go down to your local shop and see if they have either in stock and take 16 mm home and try it. if sloppy return and get 15mm. i donot have a 3rd set of calipers and lost the battery cover finding these out.
     
  12. Kieren Horn

    Kieren Horn MariosUncle

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    Yeah that’s sweet! Thanks heaps I appreciate it!! I’ll keep you updated
     
  13. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    M16 x 1.5mm thread on the pit bike's
     

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