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Pinned FZR250 3LN1 carb service and tune

Discussion in 'Yamaha 250cc In-Line 4's' started by Oz_gone, Apr 2, 2015.

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  1. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

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    these would be perfect:

    image.jpg
     
    Grasshopper, Apr 4, 2015
    #41
  2. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

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    Hey @Oz_gone, you and @Linkin should catch up some time: he's in Zetland and your in Surry Hills..... you can compare Fizzer notes..
     
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    Grasshopper, Apr 4, 2015
    #42
  3. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Are there any outlet that would allow you to connect them to the airbox?
     
    maelstrom, Apr 4, 2015
    #43
  4. Oz_gone

    Oz_gone Member

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    Yep, thats what we thought. There has to be a way to connect to the carb body and they dont have a particular connection the other end...They just hang there.

    Do they have to be 'one way' breathers tho?
     
    Oz_gone, Apr 4, 2015
    #44
  5. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

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    Ah.. no they're just a filter, I don't know if they're meant to be one way breathers....... Interesting, my FZR carbs never had them on, just had the tubes hanging off... I put the proper ones on, but never noticed any difference.... I suppose they're meant to filter the air going in.....
     
    Grasshopper, Apr 4, 2015
    #45
  6. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Did we use the 2 spares I had in the end?
     
    GreyImport, Apr 4, 2015
    #46
  7. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

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    Yeah I put them on my bike, I think there are still a couple here somewhere...
     
    Grasshopper, Apr 4, 2015
    #47
  8. Murdo

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

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    This is what I found in Robbo's carb tops with the filters.
    x 015.JPG
     
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    Murdo, Apr 4, 2015
    #48
  9. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Interesting ..... Ive never found that in any of the carbys here

    @Murdo .... are u splitting the bank ? ... if u want to use the ultrasonic cleaner let me know.
     
    GreyImport, Apr 4, 2015
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  10. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

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    Yes, I've seen that in one of my sets of carbs... not quite as much though... I think it was the originals...
     
    Grasshopper, Apr 4, 2015
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  11. Murdo

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

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    Thanks Grey, already done.
     
    Murdo, Apr 4, 2015
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  12. Oz_gone

    Oz_gone Member

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    Thats from the actual filters inside breaking down after 20 odd years...See the earlier fotos ;)
     
    Oz_gone, Apr 4, 2015
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  13. Oz_gone

    Oz_gone Member

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    Odd they dont connect to the air box then...As that is filtered already. Was worried that they gave some sort of pressure effect as they seem to be one way!
     
    Oz_gone, Apr 4, 2015
    #53
  14. kiffsta

    kiffsta Senior Member

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    Post office was shut today, Tuesday it is
     
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    kiffsta, Apr 4, 2015
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  15. richie

    richie Active Member

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    I also just did my carbs with keyster carb kits i felt your pain when they didnt have the brass hex screw for emulsion tube as two of mine were broken and replaced by previous owner with normal screws causing all sorts of problems, i got my two off fowlers in the UK for 15 pounds using the part number 1hx 14565 that @GreyImport gave me :)
     
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    richie, Apr 8, 2015
    #55
  16. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    You should be able to buy them from your local Yamaha dealer.
     
    maelstrom, Apr 8, 2015
    #56
  17. Oz_gone

    Oz_gone Member

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    We eventually got the pilot jet out of the housing and with the extra jet housing bolt that Kiffsta sent we should be able to move forward now.
    Also managed to pick up a set of used 3LN carbs from WA that might be good for spares if anything else go's wrong or resell if not.
     
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    Oz_gone, Apr 14, 2015
    #57
  18. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Good news!
    I suggest that you lubricate all of the brass threads when you fit all of those new jets and the pilot screws too.
    Dissimilar metals gall and brass is notorious for it. When you hear a squeaking thread, that is the sound of tearing metal. I use WD40
    cheers
    Blair
     
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    maelstrom, Apr 14, 2015
    #58
  19. Oz_gone

    Oz_gone Member

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    Yup...We read that in your 'kill yourself' post.
    We did larf :)
     
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    Oz_gone, Apr 14, 2015
    #59
  20. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Aaaah my humour did not go unnoticed. Have to have something to laugh about :p
    I usually write my web pages as irreverent as possible and then I have to edit them
    so as not to offend and confuse the world at large.
     
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    maelstrom, Apr 14, 2015
    #60
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