CRF70F carburetor issue
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    Kiwi
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    CRF70F carburetor issue

    by Kiwi » Thu May 23, 2013 3:45 pm

    A while back my daughter crashed her 2007 CRF70F in a large mud puddle. When I started up the bike it ran poorly and took a while to clean itself out (likely burning up some amount of muddy water that it ingested). The other day I:

    - Removed and cleaned the air filter setup
    - Removed and cleaned the exterior of the carburetor
    - I then took things apart with the carb and used brake cleaner to wipe/clean all surfaces, blow out all holes/passages, and generally de-gunk everything. Truthfully, the inside of the carb didn't really look too dirty, but I opted to clean everything anyway.
    - I also removed the fuel bowl, removed the jets, and such to individually clean them.
    - I reinstalled everything and then double-checked carb operation (all seemed fine). In addition, the throttle cable and carb slide seems to work fine (no hang-ups).

    After reinstalling the carburetor, it now runs better throughout the rpm range. However, when at idle the rpm fluctuates ... sometimes fine, sometimes very high, sometimes too low.

    Any idea the problem is?
    2007 CRF450X with modified airbox, Uni filter w/no backfire screen, NCVS needle on 4th, 172 main, CRFs fuel screw at 2, Boyesen QS3, stock smog, 450R cam, FMF Megabomb header, Pro Circuit T-4 muffler, Pro Taper Evo bars, AS suspension
  • User avatar
    Kiwi
    Posts: 363
    Joined: Thu Sep 25, 2008 12:22 pm

    by Kiwi » Fri Jun 07, 2013 11:35 am

    Bueller? Bueller?

    Anyone?
    2007 CRF450X with modified airbox, Uni filter w/no backfire screen, NCVS needle on 4th, 172 main, CRFs fuel screw at 2, Boyesen QS3, stock smog, 450R cam, FMF Megabomb header, Pro Circuit T-4 muffler, Pro Taper Evo bars, AS suspension
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    crfsonly
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    by crfsonly » Fri Jun 07, 2013 12:53 pm

    typically this is a sign of a lean condition. make sure there aren't any air boots leaks that would lean out the mixture. if not, i'd recommend replacing the jets to eliminate them as the source.
    OEM Parts for Honda - Yamaha - Suzuki - Kawasaki: http://yeltrik.com
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  • User avatar
    Kiwi
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    by Kiwi » Fri Jun 07, 2013 1:34 pm

    Oh, and I bet that you just happen to sell new jets ... don't you!

    I see how you operate.

    :D
    2007 CRF450X with modified airbox, Uni filter w/no backfire screen, NCVS needle on 4th, 172 main, CRFs fuel screw at 2, Boyesen QS3, stock smog, 450R cam, FMF Megabomb header, Pro Circuit T-4 muffler, Pro Taper Evo bars, AS suspension
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    crfsonly
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    by crfsonly » Fri Jun 07, 2013 4:53 pm

    Actually, no we don't. Not unless you are planning on purchasing 1,000,000 of them and then I will gladly get in the CRF70F jet selling business. ;-)
    OEM Parts for Honda - Yamaha - Suzuki - Kawasaki: http://yeltrik.com
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