09 crf 250r starting problems
  • Efly904
    Posts: 2
    Joined: Wed Jan 04, 2017 4:28 pm

    09 crf 250r starting problems

    by Efly904 » Wed Jan 04, 2017 4:51 pm

    Hey everybody I have an 09 crf 250r, I moved to Florida a lil while back from Nevada and took the bike with me when I moved. Ever since I moved to fl it won't start. I changed the jetting multiple times and the closest I've had to it actually running is
    Main 172
    Pilot. 42
    Needle NMUU
    Needle settling is on the third notch. I have plenty of spark but it's way to rich as the plug is black and wet. . It just backfires when I try to start the bike.
    Any help would be gladly excepted as I haven't ridden in some time because of the issue and the local riding community is not big.
  • Leardriver
    Posts: 346
    Joined: Wed May 05, 2010 10:33 am

    by Leardriver » Wed Jan 04, 2017 6:08 pm

    The main and needle and needle position don't have any effect on starting. Just the pilot and fuel screw.
    I suspect a plugged passage above the pilot of fuel screw. Are you using a new pilot?
  • Efly904
    Posts: 2
    Joined: Wed Jan 04, 2017 4:28 pm

    by Efly904 » Wed Jan 04, 2017 6:21 pm

    I am using a new pilot, everthing is new. Do you think that the jetting is fine for sea level?
    Thank you for your reply!
  • Leardriver
    Posts: 346
    Joined: Wed May 05, 2010 10:33 am

    by Leardriver » Thu Jan 05, 2017 9:57 am

    A 42 pilot was the stock set up, so I have to assume that it runs ok with that.
    I am not familiar with a NMUU needle. Stock is a NNSU. A 175 main is standard, so a 172 is way close enough.
    Will the bike start and idle? Baby steps first.
    If it won't then the jetting isn't the problem at all, it is a plugged passage or fuel supply into the carb.

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