07 crf250r carb help?
  • pullencrf
    Posts:19
    Joined:Wed Apr 08, 2009 7:51 pm
    07 crf250r carb help?

    by pullencrf » Sun Jan 17, 2010 7:30 pm

    Just put motor back together. New head and valves, new hotcams stage 2 cam, crower valve springs, new cylinder, CP 13.5:1 piston. I am at sea level and outside temp was about 40F. I went for a break in ride. I did some light trail riding. After about 1hr of slow riding I started to pick up the pace and the bike ran great for another hour. I went back to the trailer to chill for a while. When I cranked the bike back up it started to pop out of the exhaust. It then would not idle. So I went home and pulled the valve cover and checked the timing and it is still dead on. There was also some deceleration backfires after 2 hrs of riding.

    Here are the carb specs for that day:
    pilot 45
    main 175
    starter 68
    stock needle
    3rd clip


    Any suggestions? Today I removed the 45 pilot for a 42 and it did the same thing. I then removed the 175main for a 172main. It would Idle great and when I went to give it throttle it would die.
  • User avatar
    marks crf
    Posts:1138
    Joined:Thu Jun 05, 2008 12:28 am

    by marks crf » Tue Jan 19, 2010 11:16 pm

    check the fuel screw
    my #00

    5th gear PINNED on the 250
    6th gear PINNED on the 125

    My van is the only TRUE factory rig

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