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  1. #1

    Join Date
    Aug 2010
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    Rebuilding BN46I

    So I opened up my 2 rebuild kits and I only see 1 check valve (item #4 on the part list). What should I do? Reuse one off the carb or order another? First time rebuilding this carb.

    http://www.mikuni.com/pdf/bn46i_rebuild-kit.pdf


  2. #2
    badjoka's Avatar
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    If the old one is not damaged (creased, kinked, etc) you can reuse it. See if it works, (just a check valve) but if its old and your in no rush to ride, then play it safe and order one.

  3. #3
    SURFnTURF's Avatar
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    Replace them (both) as they are your fuel pump check valves and the grommet's as well. Pay close attention to #14 and make sure it sits nice and flat against the valve assembly.Check your needle and seat for any wear/damage as well.

  4. #4
    badjoka's Avatar
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    Nothing more suprsing then opening the package and having #14 flip out onto the garage floor and actually finding it!

  5. #5

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    Aug 2010
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    Altoona, IA
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    Thanks for the replies. I'm just ordered 2 more for good measure.

    Next problem is... have you ever experience the screws being way to tight to get off? On the MAG the 2 regulator screws are damn near stripped and the screw holding the retainer plate for the seat is completely stripped. On the PTO carb 7 of the 8 screws are damn near impossible trying to unscrew them without them stripping.

    Any suggestions???

  6. #6
    SURFnTURF's Avatar
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    These are salt water carbs hey ? You will require one of these to get all the screws out "Impact Screwdriver" and the seat screw you will have to have it drilled and tapped again using a larger diameter machine screw.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  7. #7
    badjoka's Avatar
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    Sears has it for around $20, awesome tool! Would never rebuild a carb without it being available.

  8. #8

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    Dec 2008
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    Chicago Northwest Indiana
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    +1 on the impact driver. I have at times had luck using a rotary tool with a disc to cut a slot in the head (not too deep) then using a slotted screwdriver that fits really well. Replace screws thereafter.

  9. #9

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    Aug 2010
    Location
    Altoona, IA
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    Thanks for the advice. I'll stop and get one of those impacts tomorrow.
    I'm going to take the carbs by my dad's shop tomorrow and see if he can work his magic since he has about 20 years of shop experience on me.

    Oh and nope. These are fresh water (well as fresh as a man made lake you can get) since I bought them a little over 2 months ago. The owner before me said he only rode around here and I'm pretty much as far as anyone from any type of salt water (I'm in Iowa).

  10. #10
    "Tearing it up on the water" seadoobutch787's Avatar
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    ++++1 on the impact driver, i bought one at auto zone and it works great. I did have a buddys carb that had the screws stripped out, if that happens you can drill the heads off and the valve body will come off, the screws will come out with a pair of pliers. It's the screw head that gets corrosion on it making it hard to come out without stripping.

    Also you should use a mikuni tool for installing those grommets for the check valve, i tried a phillips screw driver before and i tore the grommet.

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