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gs550 performance?

This is a discussion on gs550 performance? within the Project Builds forums, part of the Caferacer.net Forums category; I've got a customer who's looking to have a full fairing "GP" racer built, he's more concerned with the look, but wants a faster engine ...

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  1. #1
    Senior Member roccitycafe's Avatar
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    gs550 performance?

    I've got a customer who's looking to have a full fairing "GP" racer built, he's more concerned with the look, but wants a faster engine as well, I'm itching to do an alloy fairing, so I'm biting. I've been told by someone that the cb550 is slow and heavy and probably won't be a good candidate, I was looking at the gs550 as a possibility. It looks to be about as heavy and slow as the cb550, but has very low compression stock and a dohc, so would it be a potential candidate for a hot cam, overbore and high compression pistons? I would probably model the body around something like the 50's augustas, so the dohc would look proper too

  2. #2
    Senior Member mlinder's Avatar
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    Handles weird. Even a stock engined gs550 with appropriate jettings (rad: fix EPA bullshit) makes them damned fast.

    How fast does he want it? I'm building some 675's right now that should be (quite a bit) more than 70hp at the crank with gs550 bottom ends.
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  3. #3
    Senior Member roccitycafe's Avatar
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    he's not tracking it, just wants it to be faster than stock, not one of those "race looking bikes". do you think jetting, a competent rebuild, bumped compression and a tuned exhaust would do it?

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  5. #4
    Senior Member monkey's Avatar
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    leave it stock
    latered

  6. #5
    Senior Member mlinder's Avatar
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    I'll tell you exactly what will do it:

    Remove airbox lid (leave in filter)

    Main jets to 112.5 to 120's, depending on location.

    One size up on idle circuit jet. Maybe two, but doubtful.

    That's it. That's all it takes.

    The gains for doing this on the GS550 are absurd. No other bike I've fucked with has the same kinds of returns with a simple slight derestriction and jetting change.


    (The above is for the 80 and later gs550's with CV carbs. I haven't done the earlier ones, nor ridden one, with regular slide piston carbs. The earlier ones may not respond as well. Head is a bit different, mainly on intake tract dimensions.)
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    It's like a Machiavellian 4-volume trilogy based on Hamlet senza misura with an ego-maniacal downs syndrome kid reading from a Rube Goldeberg-esque kindle.

  7. #6
    Senior Member crazypj's Avatar
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    The early slide carb models needed a lot of work, but, you could get ports a really good shape and flow.
    I spent about 12~14hrs on the first intake port then the others went quite quick (about 25~30 hrs in cyl head)
    Set of cams, real race exhaust, carbs bored 1.25mm, big bore kit (forget how big, 718cc?)
    It was a LOT faster than Honda VF 750 (geared for 175mph would almost pull red-line)
    Speedo never read over 93mph
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  8. #7
    Senior Member mlinder's Avatar
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    quote:Originally posted by crazypj

    The early slide carb models needed a lot of work, but, you could get ports a really good shape and flow.
    I spent about 12~14hrs on the first intake port then the others went quite quick (about 25~30 hrs in cyl head)
    Set of cams, real race exhaust, carbs bored 1.25mm, big bore kit (forget how big, 718cc?)
    It was a LOT faster than Honda VF 750 (geared for 175mph would almost pull red-line)
    Speedo never read over 93mph
    Well there ya go.
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    It's like a Machiavellian 4-volume trilogy based on Hamlet senza misura with an ego-maniacal downs syndrome kid reading from a Rube Goldeberg-esque kindle.

  9. #8
    Senior Member mlinder's Avatar
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    Or, rather, Bob's yer uncle.
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    It's like a Machiavellian 4-volume trilogy based on Hamlet senza misura with an ego-maniacal downs syndrome kid reading from a Rube Goldeberg-esque kindle.

  10. #9
    Senior Member roccitycafe's Avatar
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    yeah, I looked for a big bore for it when I saw it on CL, couldn't find one available though. there was one in Syracuse for about $300, I shoulda just made the drive and snagged it, now I'll probably never find one again haha

  11. #10
    Senior Member mlinder's Avatar
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    Seriously don't need to go big bore for someone who isnt going ot race it. If you just do the stuff I said, assuming it's 80 or later. And you can try with the earlier ones, too.
    I reckon mechanical slide piston carbs would take to velocity stacks a fair bit easier than the CV's.
    http://quiterandom.hubpages.com/hub/...sic-motorcycle How to buy a used bike
    http://quiterandom.hubpages.com/hub/...the-Cafe-Racer How to build a cafe racer

    It's like a Machiavellian 4-volume trilogy based on Hamlet senza misura with an ego-maniacal downs syndrome kid reading from a Rube Goldeberg-esque kindle.

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