Quieter Exhaust

Discussion in 'Technical Help' started by curlywurly, May 9, 2025 at 6:29 PM.

  1. curlywurly

    curlywurly Member

    Mar 9, 2021
    29
    18
    Oklahoma
    #1 curlywurly, May 9, 2025 at 6:29 PM
    Last edited: May 9, 2025 at 7:48 PM
    My 98 Thunderbird Sport has a custom made all stainless steel exhaust, 3 into 2, straight threw, sounds great, but is very loud and I would like to tone it down a little.

    I see there are 2 1999-2001 Legend TT mufflers for sale on a well known auction site, they look like they will fit, maybe with some adjustment, but is there anything else I need to consider? For example, will it impact jetting/back pressure etc?

    Bike, will only run with the choke nearly fully on (running lean I guess), but runs well when the choke is on, but turn the choke off and dies immediately, the bike hasn't been started for 10 months so the carbs might be gummed up. I have removed the fuel tank and ran a separate fuel supply with fresh fuel, but didn't make much difference, so the carbs will have to be stripped. I mention this the mechanic who might be doing the work also said that I really should install the quieter exhausts before he strips and tune the carbs.

    Another option I've looked at is fitting a DB Killer insert, but they seem to be 51mm, while my current set-up has ~40mm opening.

    tbs1-rh-side.jpg
     
  2. Eldon

    Eldon Elite Member

    Nov 14, 2018
    6,825
    800
    North Yorkshire
    Needing nearly full choke to run doesn't sound like an exhaust issue to me.
     
  3. curlywurly

    curlywurly Member

    Mar 9, 2021
    29
    18
    Oklahoma
    Yes, separate issue, which will be fixed hopefully.

    Order if work is something like this.

    1. Purchases new quieter exhaust cans
    2. Fit them
    3. Then take motorcycle to mechanic so he can tune and fix carbs.
     
  4. Pegscraper

    Pegscraper Elite Member

    Jun 12, 2020
    3,433
    800
    Yorkshire
    Blocked pilot jets.
     
    • Agree Agree x 1
  5. crispey

    crispey crispey creme de la creme

    Nov 6, 2014
    7,248
    1,000
    Uk
    You will definitely have to re-jet them, I've an EFI and every time I had to change pipes. BC PREDS to 2 into 1 to TORS I have to re-map them,
    Unless the fact it's not running right is that it wasn't re-jetted for the pipes you have now.
     
  6. curlywurly

    curlywurly Member

    Mar 9, 2021
    29
    18
    Oklahoma
    Thanks Crispey.

    So I need to source some pipes first, there is a company in Germany (I'm in the USA) selling new ones, but they haven't answered my questions yet.

    Also on ebay, a single one from a TBS (I need 2), and a couple from a Legend TT that look good, but not sure the Legend and TBS are interchangeable.

    My research has found this out.

    Two cans on the right are the 1998-1999 years only, with a unique sub-frame as well.

    6 Differerent hangers
    Adventure trumpet Hanger
    Adventurer slash cut hanger
    Legend reverse cone Hanger
    Thunderbird pea shooter hanger
    2 different thunderbird sport hangers.

    I'm going to look at the paperwork/receipts I got with the bike, find out who made the current pipes on there, they are very well made, just so loud!
     
Loading...

Share This Page