Bent throttle needle.

Discussion in 'Motorbike Technical Discussion' started by Ian Field, Apr 27, 2012.

  1. Ian Field

    Ian Field Guest

    How dodgy is a *VERY* slightly bent throttle needle?

    Once I get a response from the parts supplier, a new needle, emulsion tube &
    main jet are going on the shopping list anyway - the previous owner mucked
    about with the carb, but to what extent?!

    Trouble is, delivery could be a week or two!

    Ian Field, Apr 27, 2012
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  2. If the jet needle rubs against the needle jet orifice as it goes up
    and down and wears it to an oval or egg shape, it will always drool a
    little excess fuel and you won't be able to lean out the idle mixture
    by turning the mixture screws.

    It's kind of hard to notice a slightly egg shaped hole, and this
    problem occurs more frequently in semi-downdraft carbs, such as on an
    FZR750 or FZR1000 Genesis motor where the cylinders are inclined at a
    35~45 degree angle, depending on the year...
    krusty kritter, May 8, 2012
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