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Info Chinese/Aftermarket 3LN Carby Boots

Discussion in 'Yamaha 250cc In-Line 4's' started by Linkin, Sep 20, 2017.

  1. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

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  2. beano

    beano Well-Known Member Premium Member

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    Absolute typical that these would show up a few weeks after I shell out a fortune for genuine Yamaha :mad::mad::mad:

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  3. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Yeah my second set arrived yesterday,
    same company marking's as the other set i just got and same as the original's, and they're now only $31 instead of the $50 i paid
     
  4. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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  5. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

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    I picked up the new aftermarket boots from the post office this morning. They appear to be of decent quality, and are numbered for cylinders 1 through 4. They are not perfect however, and may require cleanup and de-burring before being put into service.

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    One set will go to the fizzer factory in the post, anyone else need a set?
     
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  6. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    I match ported mine to the head, didn't need to take much off.
    One mounting hole needed to be drilled out too, it was filled with rubber
     
  7. logan anderson

    logan anderson Active Member

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    Ok, managed to get a set of these (one hole filled in) has anyone had any luck with them and do you need a sealant between these and the engine?
     
  8. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Nah mine have been all good since i fitted them, i just drilled out that rubber in the 1 hole.
    I did match port mine to the head port's though, i used a Dremel with a 80grit 13mm sanding drum and took about 1mm to 3mm out of the inside to straighten up the flow.
    I didn't use anything to seal them to the head, the moulded in rubber seal work's fine underneath.
    I also coated the inside's and outside's of the rubber/nbr/pvc with some silicon grease to make removing the carby's easier in the future if i need to 10Pcs-Dremel-Accessories-12-5mm-Grit-80-Sanding-Bands-3-17mm-Sander-Drum-Mandrel-Rotary-Tool.jpg
     
  9. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

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    Yea definately put rubber grease on the inside where the carby sits .... cuz if you dont have to remove/refit the carbys 5000 times being an FZR , then u arnt trying :D

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  10. logan anderson

    logan anderson Active Member

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    You say that, however at the moment except some bogging on take off now and again (which I think is either the fuel filter being clogged or the fuel pump being dead ) I'd rather not touch the carbs when they look like this:

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  11. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    So how will you swap the manifold's if you aren't touching the carb's ?
    Look's like you need to order the 2x full seal kit's from @maelstrom, and get rid of that epoxy/silicon asap ?
     
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  12. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

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  13. logan anderson

    logan anderson Active Member

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    I might start my own post for this, save post jacking
     
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  14. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Just an update on my replacement china intake manifold's
    I was doing some work on my bike today and noticed the new intake's have hairline cracking just like the original's,
    not sure if it affect's the idle etc yet but i'll check when i get the fuel tank back on by spraying them with some wd40 etc
    They are now 18 month's old and i coated them in silicon grease before fitting them
    I guess spending $25 every 18 month's to replace them isn't too bad

    How are your genuine boot's holding out @beano ?



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    Last edited: Apr 11, 2019
  15. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    They will certainly be NBR. The OEM will most likely be NBR-PVC blend which has better weathering capability but we all know they go hard and crack too. Like you said it will come down to cost over time and whether you plan on keeping the bike.
     
  16. beano

    beano Well-Known Member Premium Member

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    @my67xr i actually have no idea, the bike is currently at my folks house about 120kms away while i finish my final year at uni.

    my exams finish in a few weeks so will be moving back home after that and hopefully will get some serious bike time in this summer.

    i will check the boots and post back up when i get home :thumb_ups:
     
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