two tw's need help
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  1. #1
    Junior Member gerryp's Avatar
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    Apr 2013
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    i have a '87 tw that starts good, idles great , carbs rebuilt, but when it warms up it stutters , backfires and barks, and has trouble idling . if i let it cool down overnight it starts all over. could it be coils or cdi? my neighbour has the same tw , his runs great unless he lets it sit for 3 or 4 days than it wont start? if he runs it every day every thing is fine. what could be wrong. he won't let me try his cdi because he thinks i may blow his cdi with my bike problems.

  2. #2
    Senior Member frog13's Avatar
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    Jun 2011
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    How many miles?.....air filter clean and oiled?....has the bike been re-jetted?.Pet-cock "filter" clean?.

  3. #3
    Senior Member arbolmano's Avatar
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    Feb 2012
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    Well, how about putting your CDI into his bike? Then you'll know if it's your CDI! Can't harm your bro's CDI that way.

    More direct would be to follow the wise sage's timing light method

    for checking the CDI on this forum. Lotta good info on this site on the problematic '87 CDI
    Tonto on the "Left Coast"
    1987 TW200 (2) 2015 BMW F700GS
    More Wagging and less Barking
    "Enjoy yourself, it's later than you think"
    Make Love not War

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  5. #4
    Senior Member Stromper's Avatar
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    Oct 2011
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    First a tank of Seafoam for both of you



    Check screen on petcock may have gel problems in the tank

  6. #5
    Senior Member rm_hm's Avatar
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    Jul 2010
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    The curse of the 87s goes on.... I'd link you to the replacement 87 cdi thread but I don't know how to cut and paste with my tablet.


  7. #6
    Member tw200_87's Avatar
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    Jul 2010
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    62
    As far as the 87 that will not start if it sits. I had this problem a while back but it seems to have resolved itself after i cleaned the carb.. I quick work around was to drain the carb bowl and let it fill with fresh gas and it would start right up..

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