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Doing... did ... the ton on an 81 GS450E

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    #16
    "We have a 2006 Rebel 450 now, and agree 90 would be about its limit."

    Honda quit making the 450 Rebel in 87, and have only sold 250's since.

    V
    Gustov
    80 GS 1100 LT, 83 1100 G "Scruffy"
    81 GS 1000 G
    79 GS 850 G
    81 GS 850 L
    83 GS 550 ES, 85 GS 550 ES
    80 GS 550 L
    86 450 Rebel, 70CL 70, Yamaha TTR125
    2002 Honda 919
    2004 Ural Gear up

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      #17
      Originally posted by gustovh View Post
      "We have a 2006 Rebel 450 now, and agree 90 would be about its limit."

      Honda quit making the 450 Rebel in 87, and have only sold 250's since.

      V

      You are right, of course. It is a 250.

      Must go bang my head a bit more to shake the facts back into place.
      "If you scare people enough, they will demand removal of freedom. This is the path to tyranny."
      Elon Musk Jan, 2022

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        #18
        Originally posted by Rob S. View Post
        Yes I would be past redline. But that's no reason to short me 74 cc's!
        Woopsie

        So the 1100 engines don't care much about the redline as well? (Others in this forum told me such for my 550s).
        #1: 1979 GS 550 EC "Red" – Very first Bike / Overhaul thread        New here? ☛ Read the Top 10 Newbie mistakes thread
        #2: 1978 GS 550 EC "Blue" – Can't make it a donor / "Rebuild" thread     Manuals (and much more): See Cliff's homepage here
        #3: 2014 Moto Guzzi V7 II Racer – One needs a runner while wrenching
        #4: 1980 Moto Guzzi V65C – Something to chill

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          #19
          Originally posted by wymple View Post
          My sister had a newer 450 Rebel than ran like a top. 90 would be a stretch. It takes a lot more to get to 100. I've never seen a 450 GS that would get there. I remember guys with CB450's that claimed an easy 120. I once got an "indicated" 108 on a new XS650, and no 450 twin anything stayed with me back then.
          It takes 30bhp for an unfaired motorcycle to do the ton.
          If it's geared right, and can't do that, something is out of whack.

          Originally posted by Spiff View Post
          Did it the last time my 850 was on the road, most scary bike moment ever, was pretty squirmish the entire bike so I quickly let down and returned to normal speeds.
          That's not inherently the fault of the bike - worn suspension, wheel bearings, swingarm bearings, forks (sliders, bearings) and tyres all play a part. A GS850 in good order will sit quite happily all day long at 80, 90, 100mph, in a rock-solid fashion - I used to earn a living by sitting at a constant cruise of 85mph for hours on end.
          If yours didn't, there's something wrong.
          Last edited by Grimly; 03-12-2017, 01:43 PM.
          ---- Dave
          79 GS850N - Might be a trike soon.
          80 GS850T Single HIF38 S.U. SH775, Tow bar, Pantera II. Gnarly workhorse & daily driver.
          79 XS650SE - Pragmatic Ratter - goes better than a manky old twin should.
          92 XJ900F - Fairly Stock, for now.

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

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            #20
            Originally posted by Grimly View Post

            That's not inherently the fault of the bike - worn suspension, wheel bearings, swingarm bearings, forks (sliders, bearings) and tyres all play a part. A GS850 in good order will sit quite happily all day long at 80, 90, 100mph, in a rock-solid fashion - I used to earn a living by sitting at a constant cruise of 85mph for hours on end.
            If yours didn't, there's something wrong.
            Well the tires where new, so that wasn't the problem, bearings where good too, no play in them. Rear suspension though might have been a likely culprit. There was also some rust issues around the sidestand area we discovered when we tore apart the bike so that might have weakened the frame and perhaps induces some frame flex?

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              #21
              Originally posted by Spiff View Post
              Well the tires where new, so that wasn't the problem, bearings where good too, no play in them. Rear suspension though might have been a likely culprit. There was also some rust issues around the sidestand area we discovered when we tore apart the bike so that might have weakened the frame and perhaps induces some frame flex?
              Interesting what you say about the rusty frame, because that might be what it is... read on.
              One thing that caught me out recently was the very slow wear rate and gradual decline of the swingarm bearings. A weird handling problem that gradually got worse over a few months. Nothing major, just a slight step-like uncertainty, that felt for all the world like tyres that were old and unsuitable (yes, they were) but that wasn't actually the problem. It had been so long since I last had to adjust the s/a bearings, I'd forgotten what it felt like. The actual adjustment needed was in the order of about 1/12th of a turn - just enough to remove the slightest degree of play I could only just feel in the arm.
              A frame that is weak in that area, because of rust or damage, might lead to some uncertain handling.
              ---- Dave
              79 GS850N - Might be a trike soon.
              80 GS850T Single HIF38 S.U. SH775, Tow bar, Pantera II. Gnarly workhorse & daily driver.
              79 XS650SE - Pragmatic Ratter - goes better than a manky old twin should.
              92 XJ900F - Fairly Stock, for now.

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

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