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    • #4053
      Mick
      Member
      • Topics: 5
      • Replies: 9
      Joined:
      Dec 19, 2019
      @daytona675
      Uk
      Mainly Triumphs

      Hello again.

      Got my sons hyosung gt125rc in the garage again, I’ve got a spare scorpion slip on that will fit if I cut flange of etc etc. I’m going take the full system off to clean it up and see if I can remove the internals of what I assume it a catalytic converter.

      My 2 questions are:

      1. Where the hell do I find new exhaust gaskets? The two for the headers and the long flexi crush type that connects the pipe?

      2. Has anyone successfully drilled and or smashed out the internals of the cat/resonator box without cutting it open and welding it back up? (I can pretty much do anything apart from welding)

      Many thanks in advance.

    • #4055
      Mick
      Member
      • Topics: 5
      • Replies: 9
      Joined:
      Dec 19, 2019
      @daytona675
      Uk
      Mainly Triumphs

      Update. After taking original end can off I discovered there is a honey combed catalytic converter in the actual end can!!!

      So in theory the shouldnt be a great deal of restriction in the box where the front pipes are?

    • #4057
      ♠️ MARCEL
      Administrator
      • Topics: 38
      • Replies: 403
      Joined:
      Dec 19, 2019
      @mf448kxn6
      North UK
      GTR

      Hey,

      You will find the copper gasket sets in the /shop/ section  or PM me if you would rather have the more basic OEM version (it’s silver, fibre ish kind of material)

      The “link pipe hollow gasketing” (where rear joins the bottom) is most likely found in bike shops locally (ring to ask 1st?)  , also the pipe diameter matters vs exterior diameter so that it sits inside nicely, it can crumble easily! – I forgot the dimensions off my head the ones hyosung uses for their standard pipes.

      If you have stock pipes with the cat-box in the bottom at the middle,  normally a welder cuts it off and then adds steel pipes to route the gas flow towards the giant pipe going to the end can.   Now you have a pipe system that is as free flow as the black widow types.

      End cans = I would keep the internals,  and stick a baffle in.   The 125 aways pulls better  (accel AND top end when the final exit hole is about the size of a 10p coin)

      If there is a huge hole with nothing, the bike screams away but goes slower until top gear, going to the hills may annoy him due to slightly less torque.  Some gases need to stay in the pipes , it’s a good thing for a vtwin where it makes peak power around 8-10k revs  than having to redline it hot all the time (valves!).

      // Meditation doesn't mean you have to sit still....

    • #4059
      Mick
      Member
      • Topics: 5
      • Replies: 9
      Joined:
      Dec 19, 2019
      @daytona675
      Uk
      Mainly Triumphs

      Hey, You will find the copper gasket sets in the /shop/ section or PM me if you would rather have the more basic OEM version (it’s silver, fibre ish kind of material) The “link pipe hollow gasketing” (where rear joins the bottom) is most likely found in bike shops locally (ring to ask 1st?) , also the pipe diameter matters vs exterior diameter so that it sits inside nicely, it can crumble easily! – I forgot the dimensions off my head the ones hyosung uses for their standard pipes. If you have stock pipes with the cat-box in the bottom at the middle, normally a welder cuts it off and then adds steel pipes to route the gas flow towards the giant pipe going to the end can. Now you have a pipe system that is as free flow as the black widow types. End cans = I would keep the internals, and stick a baffle in. The 125 aways pulls better (accel AND top end when the final exit hole is about the size of a 10p coin) If there is a huge hole with nothing, the bike screams away but goes slower until top gear, going to the hills may annoy him due to slightly less torque. Some gases need to stay in the pipes , it’s a good thing for a vtwin where it makes peak power around 8-10k revs than having to redline it hot all the time (valves!).

      It’s cool, it’s a sensible scorpion end can, has a fixed baffle in and not completely empty. I had it left over from a bike I stripped a while back. over the heavy and highly restrictive standard end can this is suitable.

      I think I will leave the cutting the box open, I managed cut the flange off the pipe in situation without damaging anything. The performance gains wouldn’t be work it.

      Thanks for the advice and the reply 👍

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