vibration at speed, 1200

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CYBORG
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vibration at speed, 1200

#1

Post by CYBORG »

well, here we go. A friend called, with a problem on his 86 1200. Vibration over 70 mph. But only in overdrive. Wil be smooth to 100 plus in 4th. Anyone have any Ideas? He says it feels like from the rear of the bike. I will be taking a look at it Saturday.
1978 custom GL1000
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Oldewing
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Re: vibration at speed, 1200

#2

Post by Oldewing »

What about that rear hub wearing,

Isn't that a 1200 problem, seems to ring a bell...


I do think we swap a rim on Gord's 1200 for this reason.. cause I have the old one out by the shed lolol lolol
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flyin900
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Re: vibration at speed, 1200

#3

Post by flyin900 »

Bearing was also an issue with it spinning in the mounting hole. Although I would expect that to show up at lower speeds too.
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Shadowjack
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Re: vibration at speed, 1200

#4

Post by Shadowjack »

How is vibration in fifth but not fourth a problem outside the engine?
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CYBORG
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Re: vibration at speed, 1200

#5

Post by CYBORG »

Shadowjack wrote: ↑Tue May 25, 2021 7:58 am How is vibration in fifth but not fourth a problem outside the engine?
I tend to agree. But would like to look at any possible solution that doesn't involve opening up the engine.....or replacing it.
1978 custom GL1000
1977 custom with 1200 engine
1985 gl1200
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CYBORG
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Re: vibration at speed, 1200

#6

Post by CYBORG »

flyin900 wrote: ↑Tue May 25, 2021 6:05 am Bearing was also an issue with it spinning in the mounting hole. Although I would expect that to show up at lower speeds too.
Brave man at 100 mph on one of these bikes. :crosso
This one has seen 130mph not that long ago.....not by me.....I agree with you
1978 custom GL1000
1977 custom with 1200 engine
1985 gl1200
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robin1731
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Re: vibration at speed, 1200

#7

Post by robin1731 »

Does it do it on the center stand?

With the front end tied down to the lift table or something obviously. ;)
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CYBORG
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Re: vibration at speed, 1200

#8

Post by CYBORG »

robin1731 wrote: ↑Tue May 25, 2021 1:22 pm Does it do it on the center stand?

With the front end tied down to the lift table or something obviously. ;)
I haven't actually seen the bike yet. will see it Saturday. I can try that. What shouldI be looking for?
1978 custom GL1000
1977 custom with 1200 engine
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robin1731
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Re: vibration at speed, 1200

#9

Post by robin1731 »

Hard to say. But use caution of course. If it has to have the rear tire spinning that fast I would be sitting on the bike. Maybe another set of eyes looking for anything out of the ordinary. And bring it up to speed slowly.

As mentioned earlier though with it doing it in OD but not in 4th gear it does point to an engine internal problem. IMO
1976 Goldwing Super Sport
1985 Honda Elite
1976 KZ900 Dragbike
1992 ZX7 Dragbike (KZ900 style motor w/NOS)
and a rotation of various purchases
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CYBORG
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Re: vibration at speed, 1200

#10

Post by CYBORG »

robin1731 wrote: ↑Tue May 25, 2021 1:31 pm Hard to say. But use caution of course. If it has to have the rear tire spinning that fast I would be sitting on the bike. Maybe another set of eyes looking for anything out of the ordinary. And bring it up to speed slowly.

As mentioned earlier though with it doing it in OD but not in 4th gear it does point to an engine internal problem. IMO
Thanks. My thoughts as well.
1978 custom GL1000
1977 custom with 1200 engine
1985 gl1200
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