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

Help FZR fix up

Discussion in 'Yamaha 250cc In-Line 4's' started by Yetiburger, Oct 7, 2017.

  1. beano

    beano Well-Known Member Premium Member

    Messages:
    126
    Likes Received:
    103
    Trophy Points:
    248
    Joined:
    Jan 20, 2005
    Gender:
    Male
    Occupation:
    engineering student
    Location:
    Ireland
    My Bike:
    fzr250r 3ln-1 and yzf-r1 5vy
    i had the seized slide housing problem on a set of carbs just last week actually, even after putting it in the parts washer at 80 celcius she was still seized solid, nearly broke my thumb trying to press it out, so i sprayed some penetrating fluid all around the edges and left it for 5 mins and they came straight out no problems.
     
    • Like Like x 2
  2. Yetiburger

    Yetiburger Member Premium Member Contributing Member

    Messages:
    34
    Likes Received:
    9
    Trophy Points:
    18
    Joined:
    Sep 11, 2017
    Gender:
    Male
    Location:
    Christchurch, new zealand
    My Bike:
    yamaha fzr250
    ok so things have not gone well. I used the one emulsion tube that i got out and sanded it so it was a bit thinner to use as a tool to press the other emulsion tubes out. I put the carb in boiling water for a while the in a jig in my vice and slowly tried to press the emulsion tube out of the carb. and i stuffed another jet housing.
    20171010_192431.jpg 20171010_192441.jpg 20171010_193838.jpg 20171010_193849.jpg
     
  3. my67xr

    my67xr Well-Known Member Premium Member

    Messages:
    1,886
    Likes Received:
    1,243
    Trophy Points:
    698
    Joined:
    Jun 18, 2016
    Gender:
    Male
    Occupation:
    Panel Beater, Spray Painter, Custom Fabricator
    Location:
    Adelaide
    My Bike:
    Yamaha's, FZR250 3LN3 1990, XT250TS 57R 1986, IT200L 43G 1984
    Look's like you need to soak the bottom of the carby's in some Threebond Super Engine Conditioner overnight, that'll loosen up most stuff
     
  4. Yetiburger

    Yetiburger Member Premium Member Contributing Member

    Messages:
    34
    Likes Received:
    9
    Trophy Points:
    18
    Joined:
    Sep 11, 2017
    Gender:
    Male
    Location:
    Christchurch, new zealand
    My Bike:
    yamaha fzr250
    so i'm looking at buying some more carbs. I have found a set but they just keeps saying theyre 3ln carbs. Are the 3ln1 carbs different to the newer 3ln models?
     
  5. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club

    Messages:
    2,878
    Likes Received:
    1,733
    Trophy Points:
    843
    Joined:
    Mar 18, 2014
    Location:
    Sydney NSW
    My Bike:
    ZXR250C
    Yes 3ln1 have different jet housings and the jetting is different
     
  6. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

    Messages:
    2,217
    Likes Received:
    1,726
    Trophy Points:
    823
    Joined:
    Dec 23, 2012
    Gender:
    Male
    Location:
    Thailand
    Home Page:
    My Bike:
    Yamaha FZR400 3TJ1
  7. kiffsta

    kiffsta Administrator Staff Member Dirty Wheel Club Contributing Member

    Messages:
    7,004
    Likes Received:
    5,149
    Trophy Points:
    943
    Joined:
    Aug 7, 2010
    Gender:
    Male
    Location:
    Brisbane
    Home Page:
    My Bike:
    GSXR250, CBR250RR, CBR900RR
    haha, you beat me to it Blair, I was about to post that link :thumb_ups:
     
  8. my67xr

    my67xr Well-Known Member Premium Member

    Messages:
    1,886
    Likes Received:
    1,243
    Trophy Points:
    698
    Joined:
    Jun 18, 2016
    Gender:
    Male
    Occupation:
    Panel Beater, Spray Painter, Custom Fabricator
    Location:
    Adelaide
    My Bike:
    Yamaha's, FZR250 3LN3 1990, XT250TS 57R 1986, IT200L 43G 1984
    I would think you can use the 3LN1 carbs on you bike if you swapped the lot over?
    Might be able to use the 3LN3 jets in the earlier carbs, they are that much different sized.
     
  9. Yetiburger

    Yetiburger Member Premium Member Contributing Member

    Messages:
    34
    Likes Received:
    9
    Trophy Points:
    18
    Joined:
    Sep 11, 2017
    Gender:
    Male
    Location:
    Christchurch, new zealand
    My Bike:
    yamaha fzr250
    so according to that guide and the jet housing these carbs are not from a 3ln1. so by that rational i guessing I can put 3ln 3 carbs on the bike if I get a complete set? also he said that the carb ID is " 3LN 00 E935 " does anybody know what that means?
     
  10. my67xr

    my67xr Well-Known Member Premium Member

    Messages:
    1,886
    Likes Received:
    1,243
    Trophy Points:
    698
    Joined:
    Jun 18, 2016
    Gender:
    Male
    Occupation:
    Panel Beater, Spray Painter, Custom Fabricator
    Location:
    Adelaide
    My Bike:
    Yamaha's, FZR250 3LN3 1990, XT250TS 57R 1986, IT200L 43G 1984
    Yeah your's are 3LN3 carb's
    Pretty sure on one end (choke control end?) of the carb's there is that number printed in ink, mine is barely readable

    If you get 3LN1 carb's the float level is different to 3LN3, 3ln1 is 16mm with the fuel level 9,2mm above the centre line on the fuel bowl
     
    • Like Like x 1
  11. beano

    beano Well-Known Member Premium Member

    Messages:
    126
    Likes Received:
    103
    Trophy Points:
    248
    Joined:
    Jan 20, 2005
    Gender:
    Male
    Occupation:
    engineering student
    Location:
    Ireland
    My Bike:
    fzr250r 3ln-1 and yzf-r1 5vy
    Either set of carbs will work, ive currently got 3ln-3 carbs on my 3ln-1, but ideally you would probably want the latest models you can get your hands on.

    i suppose the easiest way you would know which ones hes selling is to get him to pull off the jet block and send you a picture as from the outside, apart from the idle adjuster they look the exact same.

    below is a pic of the 3ln-3 model carb on the left and the 3ln-1 model on the right. the main difference visually is the jet channels are wider on the 3ln-1.

    D788172B-A64D-436C-BB2D-E833196F0928_zpsmijjktav.jpg


    There are other differences in jetting etc, ill put these in the chart below, but either set will run your bike.

    carb chart.PNG
     
    • Like Like x 1
    • Informative Informative x 1
  12. Joker

    Joker CLUB250 Staff Member Premium Member Ride and Events Crew Contributing Member

    Messages:
    2,460
    Likes Received:
    1,273
    Trophy Points:
    798
    Joined:
    Feb 2, 2014
    Gender:
    Male
    Location:
    Melbourne
    My Bike:
    FZR250R 3LN3, FZR400 3EN2, GSX650F
    I run 3LN3 carbs on my 3LN1 engine no issues so far. I didn't even bother changing them from when they ran on the 3LN3. Maybe I'll need to do some tuning though, yet to be seen as bike is still on thebench.
     
  13. Yetiburger

    Yetiburger Member Premium Member Contributing Member

    Messages:
    34
    Likes Received:
    9
    Trophy Points:
    18
    Joined:
    Sep 11, 2017
    Gender:
    Male
    Location:
    Christchurch, new zealand
    My Bike:
    yamaha fzr250
    Ohk sweet. Ive already bought all the kits for the 3ln1 carbs which could be a problem. I guess its just a case of what carbs i can find.
     
  14. my67xr

    my67xr Well-Known Member Premium Member

    Messages:
    1,886
    Likes Received:
    1,243
    Trophy Points:
    698
    Joined:
    Jun 18, 2016
    Gender:
    Male
    Occupation:
    Panel Beater, Spray Painter, Custom Fabricator
    Location:
    Adelaide
    My Bike:
    Yamaha's, FZR250 3LN3 1990, XT250TS 57R 1986, IT200L 43G 1984
    Don't forget this one, for the 3LN5, but might be another version of the 3LN6 3LN7 ?

    images?q=tbn:ANd9GcQudK0P3QGx42oKGZ9cnCQxqXdqnj6rnRf60jqvUK2wLMwsGDNP.jpg
     
  15. Yetiburger

    Yetiburger Member Premium Member Contributing Member

    Messages:
    34
    Likes Received:
    9
    Trophy Points:
    18
    Joined:
    Sep 11, 2017
    Gender:
    Male
    Location:
    Christchurch, new zealand
    My Bike:
    yamaha fzr250
    So I have some 3ln1 carbs coming so i'll soak them for a while before i try pull them apart. I tried shifting through the box and seem to have a couple of false neutrals around 4th and 5th. I talked to a guy who said it might be the shims between the gears. has anybody come across this before or know the specs for the gearbox?
     
  16. my67xr

    my67xr Well-Known Member Premium Member

    Messages:
    1,886
    Likes Received:
    1,243
    Trophy Points:
    698
    Joined:
    Jun 18, 2016
    Gender:
    Male
    Occupation:
    Panel Beater, Spray Painter, Custom Fabricator
    Location:
    Adelaide
    My Bike:
    Yamaha's, FZR250 3LN3 1990, XT250TS 57R 1986, IT200L 43G 1984
    When moving the shift lever and finding the false neutrals are you turning the front sprocket forwards at the same time, eg back wheel off the ground ?
    The gears may not be meshing properly through the dogs and not allowing it to go up through the gears properly ?
     
  17. Yetiburger

    Yetiburger Member Premium Member Contributing Member

    Messages:
    34
    Likes Received:
    9
    Trophy Points:
    18
    Joined:
    Sep 11, 2017
    Gender:
    Male
    Location:
    Christchurch, new zealand
    My Bike:
    yamaha fzr250
    I was just rocking the bike back and forth between shifts. do you think maybe it would be different when riding it?
     
  18. my67xr

    my67xr Well-Known Member Premium Member

    Messages:
    1,886
    Likes Received:
    1,243
    Trophy Points:
    698
    Joined:
    Jun 18, 2016
    Gender:
    Male
    Occupation:
    Panel Beater, Spray Painter, Custom Fabricator
    Location:
    Adelaide
    My Bike:
    Yamaha's, FZR250 3LN3 1990, XT250TS 57R 1986, IT200L 43G 1984
    Yeah i've had a few bike's that i thought the same, but they worked fine with the engine running
     
  19. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

    Messages:
    6,739
    Likes Received:
    4,078
    Trophy Points:
    943
    Joined:
    Jun 14, 2012
    Gender:
    Male
    Occupation:
    Troublemaker
    Location:
    North by NW NSW Oztralia - Tamworth
    My Bike:
    *Kawasaki ZXR250C *Yamaha FZR250R 3LN1 *Suzuki GSX250 *Triumph Bonneville 750 T140V
    Very different out on the road under load and with a few RPM and a bit of oil floating about inside

    Just like idling and a few revs on the stand in the driveway or workshop ... a good start but getting out on the road and giving it the beans is the true test

    Get it running properly first .... and the carbs on an FZR are the biggest challenge

    And by look of some of those pics above I suggest u put away the big hammer .... the carbs are 25yrs old and brass is soft to begin with .... the slide housings are always hard to get out , especially if its the first time
     
    • Agree Agree x 2
    • Like Like x 1
  20. Yetiburger

    Yetiburger Member Premium Member Contributing Member

    Messages:
    34
    Likes Received:
    9
    Trophy Points:
    18
    Joined:
    Sep 11, 2017
    Gender:
    Male
    Location:
    Christchurch, new zealand
    My Bike:
    yamaha fzr250
    So what is everybodies favorite penetrating lubricant?
     

Share This Page