Carb Crud

This topic contains 3 replies, has 3 voices, and was last updated by Profile photo of bambam bambam 1 year, 6 months ago.

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  • #75114
    Profile photo of sjm205
    sjm205
    Registered Member
    RideCBR Regular
    Points: 3,190

    I recently rescued a ’91 F2 from it’s long, cold hibernation of at least 6 years. I knew the carbs would be ugly, but isn’t it interesting that each one developed a different color crud? I wonder if the down-draft mice droppings played some part.

    Well, new battery has arrived. Air filter and tires are on order. Band new chain and sprockets were in the box. She should scrub up nicely in a few weeks.

    #75136
    Profile photo of kerosene
    kerosene
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    RideCBR Regular
    Points: 2,666

    Looks like rusted tank crud to me

    #75142
    Profile photo of sjm205
    sjm205
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    RideCBR Regular
    Points: 3,190

    Thankfully the tank appears rust free. It will need a good flushing and the petcock is pretty much seized right now. The air filter rotted through and grew stalactites (or mites, whichever hang down) that dripped into the carbs. I’ve stripped the floats, jets, slides, etc into zip-locs but don’t want to separate the bank. It’s about time for the elbow grease.

    #75143
    Profile photo of bambam
    bambam
    Registered Member
    RideCBR Guru
    Points: 22,470

    It looks they will need a good long soak in carb cleaner. Sounds like you have the right idea here , just keep this in mind, you can do a real good job of cleaning things out but if you dont do the full soak , it might not get all of the tiny holes clean , especially the idle jets. It would suck to get everything back together and find out there is an issue. If needed , use a scribe to mark the carbs 1,2,3,4 and break them down so you can get them to soak in carb cleaner for a while.

    Depending on when the last time this bike ran , it could also be ethanol related problems, If so , it will need a good bit of soak time- possibly days on end.

    after re-assembly , be sure to do a good sync on these carbs so it will run right.

    Good Luck Brother. F2’s rock!

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