/ Register

  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Help BDST28 throttle butterflys

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

Page 2 of 2
  1. soames

    soames Well-Known Member

    Messages:
    60
    Likes Received:
    33
    Trophy Points:
    213
    Joined:
    Nov 23, 2014
    Gender:
    Male
    Occupation:
    problem finder
    Location:
    milton keynes uk
    My Bike:
    fzr250 3ln1
    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

    Messages:
    5,111
    Likes Received:
    3,478
    Trophy Points:
    1,148
    Joined:
    Dec 23, 2012
    Gender:
    Male
    Location:
    Thailand
    Home Page:
    My Bike:
    Yamaha FZR400 3TJ1, Honda MC22
    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
    #22
  3. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

    Messages:
    5,111
    Likes Received:
    3,478
    Trophy Points:
    1,148
    Joined:
    Dec 23, 2012
    Gender:
    Male
    Location:
    Thailand
    Home Page:
    My Bike:
    Yamaha FZR400 3TJ1, Honda MC22
    maelstrom, Dec 16, 2014
    #23
  4. soames

    soames Well-Known Member

    Messages:
    60
    Likes Received:
    33
    Trophy Points:
    213
    Joined:
    Nov 23, 2014
    Gender:
    Male
    Occupation:
    problem finder
    Location:
    milton keynes uk
    My Bike:
    fzr250 3ln1
    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
    #24
  5. soames

    soames Well-Known Member

    Messages:
    60
    Likes Received:
    33
    Trophy Points:
    213
    Joined:
    Nov 23, 2014
    Gender:
    Male
    Occupation:
    problem finder
    Location:
    milton keynes uk
    My Bike:
    fzr250 3ln1
    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
    #25
  6. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

    Messages:
    5,111
    Likes Received:
    3,478
    Trophy Points:
    1,148
    Joined:
    Dec 23, 2012
    Gender:
    Male
    Location:
    Thailand
    Home Page:
    My Bike:
    Yamaha FZR400 3TJ1, Honda MC22
    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
    #26
  7. soames

    soames Well-Known Member

    Messages:
    60
    Likes Received:
    33
    Trophy Points:
    213
    Joined:
    Nov 23, 2014
    Gender:
    Male
    Occupation:
    problem finder
    Location:
    milton keynes uk
    My Bike:
    fzr250 3ln1
    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
    #27
  8. soames

    soames Well-Known Member

    Messages:
    60
    Likes Received:
    33
    Trophy Points:
    213
    Joined:
    Nov 23, 2014
    Gender:
    Male
    Occupation:
    problem finder
    Location:
    milton keynes uk
    My Bike:
    fzr250 3ln1
    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
    #28
  9. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

    Messages:
    5,111
    Likes Received:
    3,478
    Trophy Points:
    1,148
    Joined:
    Dec 23, 2012
    Gender:
    Male
    Location:
    Thailand
    Home Page:
    My Bike:
    Yamaha FZR400 3TJ1, Honda MC22
    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
    #29
  10. soames

    soames Well-Known Member

    Messages:
    60
    Likes Received:
    33
    Trophy Points:
    213
    Joined:
    Nov 23, 2014
    Gender:
    Male
    Occupation:
    problem finder
    Location:
    milton keynes uk
    My Bike:
    fzr250 3ln1
    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
Page 2 of 2

Share This Page