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Drilling jets

Discussion in 'Hyosung 250cc' started by marc, Jun 15, 2014.

  1. marc

    marc Member

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    Just a question for anyone on here could I drill my own jets if so how do I know what size bit too use I have a 90 main front carb jet and a 20 pilot jet in front and rear is 87.5 main and 20 pilot need to know what size I would use its abit hard to find some one in aus who does a cheap jet kit so if I can do it myself cheaper then I would give it a shot
     
  2. Th3_Huntsman

    Th3_Huntsman Senior Member Premium Member Contributing Member

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    That seems like a horrible idea, have you got your carb model number to search for jets with, it should be interchangeable across the manufacturer of the carbs
     
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  3. Mclaren

    Mclaren Well-Known Member Contributing Member

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    You can get jet drills bits they arnt cheap but u want to make sure you right as once done can not be undone!!! U use a hand piece and drill by hand

    image.jpg
     
    Last edited by a moderator: Jun 15, 2014
  4. Th3_Huntsman

    Th3_Huntsman Senior Member Premium Member Contributing Member

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    your bike has 2x 26mm Mikuni carburetors so you should just be able to ebay mikuni jets
     
  5. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Last edited by a moderator: Jun 17, 2014
  6. Th3_Huntsman

    Th3_Huntsman Senior Member Premium Member Contributing Member

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  7. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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  8. Th3_Huntsman

    Th3_Huntsman Senior Member Premium Member Contributing Member

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    double check measurements for the actual size of the jet but i have part numbers for you,
    Below is the mikuni part code for the jet
    N100.604-xx (xx is the size jet you would like) so in your case
    N100.604-92.5
    N100.604-95
     
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  9. Frankster

    Frankster See the World before you leave it Staff Member Premium Member Ride and Events Crew

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    LOL, I concur. I just bought some "rare" jets from wemoto for $3 each. Not worth rooting around drilling unless you have absolutely no choice.
     
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  10. Murdo

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

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    Why do you want to drill the jets? What makes you think that you need the bigger jets? Is engine running lean or just not happy?
     
  11. marc

    marc Member

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    seems to play up under pressure fine down low but anything over 40 coughs and splutters bad not sure if its only a airbox issue or not as it dosent have the filter part on it at the moment so just getting straight air also got straight pipes on it

    am also not sure on float height a guy from another forum messaged me the other day and said the manual was a misprint its 7mm not 17mm they need to be set at bit confused
     
    Last edited by a moderator: Jun 19, 2014

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