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Help BDST28 throttle butterflys

Discussion in 'Tech Tips' started by soames, Dec 8, 2014.

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  1. soames

    soames Well-Known Member

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    OK so got hold of Yamaha UK from the carb ID 3ln 20 they were used on bikes in 93/94 so they are in fact 3ln 6 /7 carbs but by the look of it they have totally different needles 5cdl25 for 1 and 4 / 5cd25 for 2/3
     
    soames, Dec 16, 2014
    #21
  2. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    They all have different needles and jets on 1&4 vs 2&3, or do you mean the needles are different to something else?
     
    maelstrom, Dec 16, 2014
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  3. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    maelstrom, Dec 16, 2014
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  4. soames

    soames Well-Known Member

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    The needles on the 3ln 20 are different between carb 1/4 and 2/3 I can see the physical difference
    Were as the 3ln 00 carbs have all the same needles across the board markings the same and no physical differenceat all
    I know the needles have a shim washer on all for carb 2/3 presume to richen the mixture
     
    soames, Dec 16, 2014
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  5. soames

    soames Well-Known Member

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    Bolloxs I mean the needles for both sets of carbs are physically totally different between the two sets and on the 3ln00 set they have a shim washer on carb 2/3
    Set 3ln20 have shim washers on all the needles and 2/3 needles are physically different from 1/4
     
    soames, Dec 16, 2014
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  6. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Yes, that is because the 3LN6 & 7 run Zeal cams and other bits and pieces. So they are slightly detuned and the redline is also a bit lower.
     
    maelstrom, Dec 16, 2014
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  7. soames

    soames Well-Known Member

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    Cheers I might swap the needles between carbs once I get one or other set sorted will update this when I get chance to
    There is one good improvement I noticed the 3ln20 has anti vibrate plastic shims that have a locating tab fits into the slide
     
    soames, Dec 16, 2014
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  8. soames

    soames Well-Known Member

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    OK had to strip down the 3ln00 carbs again because I can't get them to stop flooding and running at 6tho idle and got three of the throttle butterfly's out the one for cylinder 3 was as I suspected bent to buggery haven't got the last one out due to one screw head mashin and yep I have a jis screwdriver so my question is are they a listed part somewhere or do I need to make one up from scratch ?
     
    soames, Dec 18, 2014
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  9. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Suzuki from the GSX-R250 GJ73 if the carbs are the same size then that should fit. Part number is 13551-06C00
    Why do you keep calling the bikes 3LN00 and 20? That is very confusing, for me at least.
    They are 3LN1, 3LN3, 3LN5, 3LN6 & 3LN7. Those designations are used at the top of every page in the parts book.
    cheers
    Blair
     
    maelstrom, Dec 18, 2014
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  10. soames

    soames Well-Known Member

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    Thanks Blair only reason I was using the code off the carb didn't think to call them 3ln1 / 3ln6/7
    Been ringing around seems I will have to get some made depending on cost
     
    soames, Dec 19, 2014
    #30
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