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BACKFIRE/BURBLEING

  • OILLEAK2008
    OILLEAK2008
    4 years ago
    Folks
    I had to recently remove the entire rear V&H muffler/header. I have not done this before. I reinstalled using a new genuine HD metal gasket that looked to be made from a compressed steel wool pad.

    So the bike now backfires/burbles and sounds like shit.  Have I fucked up the re-install?  After I heard the results of my handiwork I re-tentioned the flange nuts but it seems now to be worse?

    I assume air is getting in/out? Should I remove it all and try again?  Is there a better product than the stock HD  gasket?

    Cheers fella's.
  • speedzter
    speedzter
    4 years ago
    Did you use the flat style gasket or the cone style ?
  • Ratbob
    Ratbob
    4 years ago
    Don’t know what bike it is but also check the O2 sensor and plug.
  • paulybronco
    paulybronco
    4 years ago
    It may even be in the connection between the muffler and header, check clamp is tight
  • tussuck
    tussuck
    4 years ago
    So.
    A:  Unless you can visually see a misaligned gasket then removal is best.
    B:  Several folks make gaskets but they are all about the same, so Harley are as good as any.
    c:  Dube check you used the correct gasket at the head end as there are two types.  Round and flat or round and cone shaped
  • Ken in Cairns
    Ken in Cairns
    4 years ago
    Putting the gasket is n the freezer overnight helps with the installation fyi.
  • OILLEAK2008
    OILLEAK2008
    4 years ago
    Sorry folks - should have mentioned the bike. Its a stock 1995 EVO.  The gasket was a HD item (not sure if the correct one) - it was tapered/beveled on one side and square on the other. I fitted it with the taper facing out to mate with the header pipe.
    My pipes are age related Vance & Hines so not sure if the shape of the mating edge shape of these makes any difference????  
  • Krash Kinkade
    Krash Kinkade
    4 years ago
    Quoting OILLEAK2008 on 24 Mar 2020 07:49 AM

    Sorry folks - should have mentioned the bike. Its a stock 1995 EVO.  The gasket was a HD item (not sure if the correct one) - it was tapered/beveled on one side and square on the other. I fitted it with the taper facing out to mate with the header pipe.

    My pipes are age related Vance & Hines so not sure if the shape of the mating edge shape of these makes any difference????  

    OILLEAK scroll back up to your first post, then go down one to second post & answer speedsters question
  • OILLEAK2008
    OILLEAK2008
    4 years ago
    Quoting speedzter on 23 Mar 2020 08:12 AM

    Did you use the flat style gasket or the cone style ?

    Hi - If 'cone' typ means one side beveled then yes. I put the square side in first with the bevel/tapered side facing out to contact the header pipe. I tightened it all up and since the burble did a re-tighten in case that fixed it. I did not.
  • OILLEAK2008
    OILLEAK2008
    4 years ago
    Quoting tussuck on 23 Mar 2020 09:06 PM

    So.

    A:  Unless you can visually see a misaligned gasket then removal is best.
    B:  Several folks make gaskets but they are all about the same, so Harley are as good as any.
    c:  Dube check you used the correct gasket at the head end as there are two types.  Round and flat or round and cone shaped

    Hi - I used a flat one side/beveled on the other. bevel side facing out.
  • bloodog
    bloodog
    4 years ago
    Quoting Ken in Cairns on 24 Mar 2020 12:44 AM

    Putting the gasket is n the freezer overnight helps with the installation fyi.

    bloodog like this post 
  • robnicko
    robnicko
    4 years ago
    is the gasket seated all the way down evenly in the port and all remnants of the old one removed?

    sounds a bit like it may not be seated correctly and the header not sealing proper / square
  • OILLEAK2008
    OILLEAK2008
    4 years ago
    Quoting robnicko on 25 Mar 2020 08:54 AMedited: 25 Mar 2020 09:33 AM

    is the gasket seated all the way down evenly in the port and all remnants of the old one removed?

    sounds a bit like it may not be seated correctly and the header not sealing proper / square

    I wondered that but was sure I got all the old one out. Perhaps I stuffed up the flush install of the new one. I guess given what you good folk have said I need to remove the system again and try the re-install again but double checking everything as I go. 
    Cheers fella's for the advise. The backfire has really been pissing me off. back to the hoist for me. Thanks one and all.

    OL
  • Muzza Wa
    Muzza Wa
    4 years ago
    For what it’s worth here is a link I used when learning how to change the pipes on my fatboy Lo. 
    https://www.fixmyhog.com/video/proper-exhaust-gasket-install-002159/#
  • Muzza Wa
    Muzza Wa
    4 years ago
    Quoting Ken in Cairns on 24 Mar 2020 12:44 AM

    Putting the gasket is n the freezer overnight helps with the installation fyi.

    Quoting bloodog on 25 Mar 2020 02:58 AM

    bloodog like this post 

    +1
  • OILLEAK2008
    OILLEAK2008
    4 years ago
    Quoting Muzza Wa on 25 Mar 2020 03:04 PM

    For what it’s worth here is a link I used when learning how to change the pipes on my fatboy Lo. 

    https://www.fixmyhog.com/video/proper-exhaust-gasket-install-002159/#

    Thanks fella.
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