Page 3 of 3 FirstFirst 123
Results 21 to 22 of 22

Thread: 1980 gs550e - fuel tap / tank noise

  1. #21
    Join Date
    Jan 2015
    Location
    Somerset, UK
    Posts
    575

    Default

    Update:

    status as was: I am sure this was the original petcock, it might have always done this.
    It was clanking along with the pulses from the vacuum tube.
    Clanking as the diaphragm for some reason was doing this:

    Analysis:
    -Riding along with fuel cap off - no change
    -engine running on and res position – no change
    -it always seemed to be bad when nearing reserve. However when I pushed it into running out on reserve and the clanking pronounced it has been a lot worse.
    -Engine running – static – pull vacuum pipe of tank – clanking stops .
    the pulses from the vacuum can be felt sucking in (1 a second)
    -tried a tighter fit vacuum pipe –no change

    Stripped petcock:
    As you can see from the picture – the diaphragm metal disk has split in two.
    -So we can say that this was the issue. BUT I renewed this from a petcock kit a while ago. (I am afraid I cannot remember the result and if it solved it for a while)

    Not good analysis BUT read on:

    I have a GSX250e 1980. the fuel tap has res/on and a prime screw.
    Fortunately it has 50mm outside to outside bolt holes and m6 bolts.
    the internals are also the same diaphragm as the original gs550e petcock.

    GSX250e one on and it works fine – no clanking.

    Q) If you remove the vacuum pipe you will feel the pulsing ?
    (When you put it back on a working fuel tap it sucks in and remains open )
    gs550e standard petcock - internals - disc broken - tapping pulse.jpg
    UKJULES
    ---------------------------------
    Owner of following bikes:
    1980 GS550ET
    1977 RD 250
    1982 GPZ 750 R1
    1980 GSX 250E

  2. #22
    Join Date
    Jan 2015
    Location
    Somerset, UK
    Posts
    575

    Default

    My bike with the gsx250e 1980 petcock.

    It works fine (for the last 3 miles)
    and has the reserve screw !! so needed when the bike is left for a while !!!

    m6 screws
    50-50mm outside to outside holes
    gsx250e 1980 petcock on a gs550e 1980- fits and works - has prime screw.jpg
    UKJULES
    ---------------------------------
    Owner of following bikes:
    1980 GS550ET
    1977 RD 250
    1982 GPZ 750 R1
    1980 GSX 250E

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •