Cat & Exhaust Flap Removal

Discussion in 'Hypermotard' started by jimmy-wonder, Jul 1, 2015.

  1. I am toying with the idea of making my own exhaust for my 1st gen 1100s, (I used to make custom stainless exhaust for cars) but I will have to remove the cat and the exhaust flap thing. Is it ok to? I think the O2 sensor is pre cat so shouldn't put EML on(I might b wrong) but I don't know what the exhaust flap does, maybe helps with engine braking??​
     
    #1 jimmy-wonder, Jul 1, 2015
  2. The flap is to restrict noise levels to pass regs, I've binned mine and it's made the bike smoother trough the mid rev range
     
    #2 Diavlo, Jul 2, 2015
  3. They can all be disabled in the ECU so you don't get errors for the Lambda and EXBV.
     
    #3 chrisw, Jul 2, 2015
  4. can that be done at any dealership with a standard ecu?
     
    #4 jimmy-wonder, Jul 2, 2015
  5. PM me
     
    #5 chrisw, Jul 2, 2015
  6. Well I tried to remove the flapper valve flap but the screws must be glued in they wouldn't budge !
    Just removed the cable end from the valve works a treat and very easy to do.
     
    #6 Gaz748R, Sep 3, 2015
  7. What position is the flap in ????
    I drilled the rivets out on the flap took 5 minutes
     
    #7 Diavlo, Sep 3, 2015
  8. Valve is sprung loaded open. No rivets just cross head screws.
     
    #8 Gaz748R, Sep 3, 2015
  9. Sorry your right they are cross headed screws that have been spot welded in, I tried to chisel the weld off but ended up drilling em out
     
    #9 Diavlo, Sep 3, 2015
  10. That would explain why I couldn't get them out.
     
    #10 Gaz748R, Sep 3, 2015
  11. I did a thread on removing the flapper valve.... With loads of pics.... Its here somewhere...
     
    #11 comfysofa, Sep 8, 2015
  12. Cant find the link
     
    #12 Gaz748R, Sep 10, 2015
  13. Just search for flapper in the hyper area... Its there... Ive just looked at it...
     
    #13 comfysofa, Sep 10, 2015
  14. Yep found it thanks. Just disconnecting the cable seems to work as well.
     
    #14 Gaz748R, Sep 10, 2015
  15. Yeah....I was just trying to be belt and braces...
     
    #15 comfysofa, Sep 11, 2015
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