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Swingarm Brace vs Crossover tube?

Discussion in 'The Garage' started by Roco22, Jan 21, 2017.

  1. Roco22

    Roco22 XS650 Enthusiast

    Had the swing arm (wiseguy) braced up/powder coated and installed.

    Neither mech or I foresaw the exhaust crossover issue….

    Now what? I wish to keep bike as stock as possible...

    Remove the new brace… or remove the crossover tube and patch the mufflers?

    How important is the crossover tube? ……….

    Yes I’ve read until I’m blue about the pulses....sonic and otherwise.

    Shouldn’t crossover be located between the headers?.......Jus axing.

    Thanks in advance for your considered on point suggestion(s).
    Swing arm 01.jpg cross.jpg XS650Ricks.JPG
  2. angus67

    angus67 Welder's penetrate deeper!!

    Ditch the crossover tube. I won't tell.
    SAFU and Roco22 like this.
  3. halfmile

    halfmile XS Builder XS650.com Supporter Top Contributor

    How long ago did you have Joe Wiseguy`s do this brace? I looked on their website and nothing came up under swing arm brace and extensions? Looks like intakes and exhaust is about all he has to offer. If you ever decide to sell this I might be interested.
  4. 650Skull

    650Skull SSSSSSSSSlither Top Contributor

    Cut the tube and plug, do it in such away it can be rebuilt if wanted. never had the experiance of the difference on the same bike. A friend has a C and had a set of aftermarket C-F mufflers without the crossover. Found a set of NOS C-F mufflers with the crossover, and without any other changes to the bike, he said it ran better and seemed to smooth out the rough edges..............he rode the bike to work every day so definatly had recent riding as a gauge.
    Roco22 likes this.
  5. Jack

    Jack XS650 Junkie Top Contributor

    Cross overs placed up front are well worth the effort in providing better low and mid range
    performance. Harley drag racers are now catching on to the benefits of the C/R tube,just google it.
    Roco22 likes this.
  6. jetmechmarty

    jetmechmarty What should I put here? XS650.com Supporter Top Contributor

    At a given RPM, the crossover tube is there to increase velocity of the escaping gasses. The engineers put it where they thought it should be. Preserve the stock exhaust. Buy a Mac.
    Roco22 likes this.
  7. angus67

    angus67 Welder's penetrate deeper!!

    But they didnt think of fork flex? Frame flex? Cut the crossover. Im no iganeir, but wouldnt more edges in the exhaust route impede exhaust velocity?
    Roco22 likes this.
  8. Roco22

    Roco22 XS650 Enthusiast

    Ok, I'll bite....what's a Mac?
  9. jetmechmarty

    jetmechmarty What should I put here? XS650.com Supporter Top Contributor

    Roco22 likes this.
  10. XStretchified650

    XStretchified650 Back in the 650 Saddle


    I wouldn't remove the braced swing arm.... its a good upgrade. There are thousands of 650's using a two into two exhaust without a crossover tube.

    I would put that stock exhaust system aside and put on an aftermarket system. If you do remove the crossover tube I agree with 650Skull to do it a way that you can put it back together. They don't make those anymore and yours appears to be in great condition. If not yourself, somebody is going to want that someday.

    Nice bike.

    Last edited: Jan 21, 2017
  11. Roco22

    Roco22 XS650 Enthusiast

    I'm not a mech...so humor me....
    Leaning towards elimination of the crossover...
    What about a flexible crossover tube?
    Something like a washing machine hose but larger diameter.
  12. Roco22

    Roco22 XS650 Enthusiast

    Within last month or so...He sent it to me and I had it welded and powder coated.
    He's around, I called him about this issue today
  13. angus67

    angus67 Welder's penetrate deeper!!

    Huh.... interesting roco. Maybe there is a 1.5 " hise out there
  14. XStretchified650

    XStretchified650 Back in the 650 Saddle

    Interesting idea. You'll have the most flex using a heat tolerant hose that matches the diameter of the inner crossover stub and welding a threaded bushing into the outer crossover stub. You could also use rigid tube if you bend down from the stubs and across. How much deflection do you need? Can't tell from your pictures.
  15. Roco22

    Roco22 XS650 Enthusiast

    Dunno yet, gonna run this past my mech & welder (son in law).
  16. retiredgentleman

    retiredgentleman XS650 Guru Top Contributor

    I agree with jetmechmarty.....................preserve the stock exhaust.
    XStretchified650 likes this.
  17. XStretchified650

    XStretchified650 Back in the 650 Saddle

    I agree with jetmechmarty and retiredgentleman and XStretchified(1st post). ....... XStretchified
  18. I'd never cut a good stock 78 exhaust! Though the modified swing arm looks great., I'd consider a TX750 swing arm for two up riding which is what you are after ? Hence backrest search ?
  19. Jack

    Jack XS650 Junkie Top Contributor

    NO,the balance tube's job is to aid in balancing out the imbalance pressures of the cylinders to enhance
    scavenging which in return boost low and mid range performance and lowers exhaust tone.
  20. Jack

    Jack XS650 Junkie Top Contributor

    It's been done using flex tubing,check out the Aussie xs650 forum
    Biff likes this.

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