Gs450 miss on left cylinder

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  • Zook
    • Feb 2026

    #1

    Gs450 miss on left cylinder

    Hi have been chasing a problem with an 81 gs 450s left cylinder had a miss at low revs,after changing ignition only small improvement,anyway the problem eventually turned up as bad fuel tap diaphragm,it has a small hole and was allowing fuel down the vacuum hose of the tap.14 bucks ebay bike is now sweet.This bike has all of 9000 km on it completely original
  • tom203
    Forum Guru
    Past Site Supporter
    • Aug 2010
    • 8925
    • Norway,Maine

    #2
    Same thing happened to me years ago...this is why I stress checking the vacuum petcock if you have a engine miss.

    That's amazing low mileage for a 1981 bike - did someone misplace it in a shed years ago?
    1981 gs650L

    "We are all born ignorant, but you have to work hard to stay stupid" Ben Franklin

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