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Thread: Removing GB500 baffles?

  1. #1
    Join Date
    23rd September 2009 - 15:22
    Bike
    1987 Honda GB500TT
    Location
    Wellington
    Posts
    8

    Removing GB500 baffles?

    Hey there
    I am thinking about removing the baffles on my GB500's exhaust. Has anyone done this to their GB and if so did the bike require retuning? I read that the bike may lose power but I have also read other forums that say it made the bike sound great - which is what I'm after. Was considering replacing the whole muffler but would prefer it if I can leave the original muffler on but make improvement to its note and performance. Cheers

  2. #2
    Join Date
    19th August 2007 - 00:07
    Bike
    Too many to count
    Location
    Auckland
    Posts
    5,944
    typically you'll lose performance moreso in the lower end, and run a bit rich.

    removing baffles can be done in any number of inventive ways, typically all of which are destructive - steel rod+hammer, hole saw, large drill, whatever butchery seems suitable

  3. #3
    Join Date
    23rd September 2009 - 15:22
    Bike
    1987 Honda GB500TT
    Location
    Wellington
    Posts
    8
    cheers thanks for that. Have decided against this. Am once again keen on the bore out to 600 and replace the whole exhaust. Time to start saving!!

  4. #4
    Join Date
    7th October 2004 - 16:51
    Bike
    R1, GSXR1000, VFR800, GB500. NSR250
    Location
    Wgtn
    Posts
    252
    I removed mine by buying an old one from the wreckers, removing the three rivets in the end and then removing the inner contents completely.

    Holy shit, what a noise! Reverse megaphone ala bogan. Fantastic fun in the Mt Vic tunnel where a real burst of throttle has pedestrians covering their ears. Jetting was ok, but I also have a Mikuni 41mm flatslide and K&N

  5. #5
    Join Date
    9th August 2005 - 19:57
    Bike
    gs1100g dr650 xl185s!
    Location
    napier
    Posts
    1,007
    i did the same on mine...drilled the rivets then put a scissor jack handle
    hook bit in the baffle opening and yanked it out.... made a nice deep
    thumping tone and not at all raspy or harsh...bearing in mind there is still
    a baffle in the box muffler under the motor, i had no noticeable loss
    of power in the low to midrange as these motors have plenty anyway
    but i did manage an extra 10km/h in top speed... easily able to reach the
    ton.
    ive now got a stainless reverse mega and headers made by custom chambers
    eliminating the heavy underslung box and twin wall headers etc
    thus saving a lot of weight
    but to be honest i far prefered the original system for sound and performance
    (i will need to modify airbox a bit and adjust jetting to suit the new pipe)
    i say rip into it...especially if your going to mod it later
    'the stickiest situation since sticky the stick insect got stuck on a sticky bun'

    Cpt Edmund Blackadder

  6. #6
    Join Date
    27th August 2007 - 20:06
    Bike
    86 GB500 TT
    Location
    wellington
    Posts
    48
    I have a megaphone with removable baffles on my GB, intended for the cb400f I think, makes a proper bloody racket

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