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83 850 Bad Head Shake

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    #16
    Yea the triples are 550 as well. I have researched and know the 850 forks were larger by a few mm. And with size come strength.

    But under all conditions the front end is solid. Barely dibes on hard braking. I put the bike on center stand and ratchet strapped the rear down to lift the front tire. And there is no binding or play anywhere. He gave me reciepts for the front end and it was a complete swap. Plus the reciepts for the new SHBs, wheel bearings, fork seals, dust boots, and progressive springs.

    Plus i am a honors graduate from a motorcycle tech school. I know what to check, how to check it and how to service all this stuff. As well as a PA motorcycle state inspector. So it all checks out wear and condition wise.

    This head shake is baffling though.

    Reason i ask is i googled and recieved results from the old gsr.com amd it stated some older heavy big 4s were known to have head shakes from the factory, just trying to find out why as my searches were inconclusive with an answer.

    Good example in a Homda CBR954RR. They have a bad head shake from factory due to power on a light bike and the front end lifting and unloading slightly. And the only cure for that other than a damper is to power through it.

    But since were on topic. Would a damper help this or should i just find a front end from a newer gsxr and swap out. And ditch the brat style and make it a modernized restomod cafe build. Then swap these newly eebuild 550 forks onto my 550.

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      #17
      Even if the 550 forks are using the 550 yokes (triples), are the 550 fork legs not a fair bit shorter than the GS850 ones anyway? That alone would reduce your trail a bit.
      I've got GS1000 forks on mine, and those are 19mm shorter than the 850 ones. I wouldn't care to go any shorter - skinnier, no way.

      None of the GS850s are prone to head shakes unless something's worn beyond sense or is way out of whack. Bad loading plays a part, too.
      ---- Dave

      Only a dog knows why a motorcyclist sticks his head out of a car window

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