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Thread: 1987 650sx

  1. #1

    1987 650sx

    I have a 1987 650SX with a BN-44 Mikuni carb. I have the low speed and idle circuit tuned, but the high speed doesn't want to come around. I have adjusted the high speed screw from 1/2 to 3 turns out in 1/4 turn increments, but it won't run right at 3/4 throttle and above. If I hold it at full throttle the power will kick in for 1 second an then bog down for a while, then kick in for a second again. It seems like it gets fuel for a second and then is starved. Any suggestions?

  2. #2
    steve45's Avatar
    Join Date
    Feb 2008
    Look for air leaks in the fuel system (filter, On-Off valve, etc.). Look at tank venting, fuel pump, etc.

  3. #3
    Will do, thanks for the reply.

  4. #4
    Is there anything else you can think of to check so I can look over it before the weekend?

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