Mikuni TM40 accelerator pump...not pumping..

Discussion in 'Thumpers' started by Outwardbound, Aug 29, 2020.

  1. Outwardbound

    Outwardbound Been here awhile Supporter

    Jan 17, 2005
    Strongsville, OH
    I have a TM40 on my DR650, and apparently the accelerator pump isn't working. The carb itself works OK, but the throttle response has dropped-off. Hopefully it's something simple like gas-gunk in the jet, but I dunno. Is this a common problem fixable on my end or do I need to sent it off? How complex/finicky is the pump? Just looking to steepen my learning curve before I tear into something of which I know little. Thanks for reading!