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Thread: Hard to start

  1. #1
    Senior Member ssgtrillium's Avatar
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    Hard to start

    I'll start by saying my bike is running great but if I leave it sitting for a few weeks it will not start unless I squirt a bit of fuel into the spark plug hole then it's fine and starts up instantly.I don't always shut the petcock off but it doesn't seem to matter anyway.
    Does anyone else have this problem?
    littletommy likes this.

  2. #2
    Senior Member fishguy's Avatar
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    IMO this is one of the WORST problems with non-pumper carbs. The TW's "constant velocity" (CV) carbs need air rushing through the venturi for ANY fuel to be sucked into the carb. At that point there is already too much air in the chamber and it takes a lot of cranking to get enough fuel in.

    CV carbs try to overcome this problem with a "fuel enrichment" circuit (the TW's "choke"). A plunger that squirts fuel directly into the combustion chamber would have been a better fix, IMO.

    So, keep some fuel additive in your gas (Startron is my favorite but Seafoam is hard to beat). Store the bike in as dry a place as possible, especially during the winter. Make sure the battery is in perfect condition, The starter needs to spin the motor as fast as possible to make enough suction.

  3. #3
    Senior Member ssgtrillium's Avatar
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    That's a great answer..Thanks.

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  5. #4
    Senior Member UncleRandy's Avatar
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    Perfect timing--I just experienced the same issue with my TW after having it sit for a period of several months. When I put the bike up for the winter, I allowed the carb bowl to "run dry", which may have contributed to the no-start issue. I took your approach Fish Guy and it worked like a charm. Thanks!
    cowboyjeff and littletommy like this.

  6. #5
    Senior Member grewen's Avatar
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    i think your T Dub is sending you a message. "RIDE ME"
    Greg

    2019 honda cb500x
    2018 honda grom
    2018 suzuki dr200

  7. #6
    Senior Member scotti158's Avatar
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    I found that ethanol gas is the worst for sitting around. A couple of weeks in the tank and I will have hard starting. Use ethanol free when ever possible.
    2013 Yamaha TW200

    1996 Yamaha TW200

    1995 Kawasaki KLR650

    2002 Yamaha RoadStar 1600 with sidecar

  8. #7
    Senior Member phelonius's Avatar
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    I am sort of hard starting when I have sat around too long too.
    Phelonius

  9. #8
    Senior Member ssgtrillium's Avatar
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    I run super with sea foam so not cheap gas.
    scotti158 likes this.

  10. #9
    Senior Member fishguy's Avatar
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    My TW runs BEST on 87 octane. If it contains ethanol I treat with Startron. It kills the adverse effects of ethanol.

    I have thought about advancing the timing a bit and trying 91 octane again. Its possible that the performance lag I see with 91 is due to the OEM timing setting being set for 87 octane's combustion characteristics.

  11. #10
    Senior Member socalnative's Avatar
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    I forward this kind of thread to the sig other as proof that I need to ride more often or else.
    scotti158, Dryden-Tdub and grewen like this.

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