Author Topic: V7III head shake  (Read 9150 times)

Offline TimmyTheHog

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Re: V7III head shake
« Reply #30 on: January 26, 2019, 04:10:15 PM »
I have seen this before on various threads.  I would have thought that moving the forks up would make the steering quicker, rather than slower.
The Breva is quick enough in the turns as it is, if anything I would be prepared to sacrifice a bit of that to get a wee bit more stability in the sweepers.  Admittedly, the slight weave only shows up usually at about 80-85 mph.

Although the quicker turn is also the result of raising the fork, I was told by doing so, you added some weight to the front wheel and reducing wind drag due to higher seating position.

Oh well, I just stop doing stupid speed and that worked too lol...
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pete roper

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Re: V7III head shake
« Reply #31 on: January 26, 2019, 04:32:35 PM »
I have seen this before on various threads.  I would have thought that moving the forks up would make the steering quicker, rather than slower.
The Breva is quick enough in the turns as it is, if anything I would be prepared to sacrifice a bit of that to get a wee bit more stability in the sweepers.  Admittedly, the slight weave only shows up usually at about 80-85 mph.

Dropping the forks through the yokes will decrease the trail and will reduce stability.

Do note that it is very common that these bikes, especially the smallblocks, leave the factory with ungreased or inadequately greases steering head bearings. This is where I would of been looking if the bike was still available for inspection. The fact the suspension is fairly pathetic also gives another avenue for screw ups.

Pete

Offline Muzz

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Re: V7III head shake
« Reply #32 on: January 26, 2019, 05:26:42 PM »
Dropping the forks through the yokes will decrease the trail and will reduce stability.

Do note that it is very common that these bikes, especially the smallblocks, leave the factory with ungreased or inadequately greases steering head bearings. This is where I would of been looking if the bike was still available for inspection. The fact the suspension is fairly pathetic also gives another avenue for screw ups.

Pete

Thanks Pete. I have not all that long ago done that when I changed out the fork oil after corresponding with you.  They had a bit of grease in them still but not much.  That has now been corrected.  The lighter oil made a huge difference to the Marzocchis.  I realise the rear ones are s**t but I can live with that with the preload set as low as it will go now that Lucy won't ride pillion these days and the extra weight from loaded bags touring does help a lot as well.
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Offline egschade

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Re: V7III head shake
« Reply #33 on: January 28, 2019, 06:40:20 AM »
I switched to the optional 110 profile tire and went to radicals.  Also installed stiffer Fork Springs given my weight. Both resulted a more stable ride.
The elder Eric in NJ

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1985 LeMans 1000
2020 V85TT Adventure
V65 SP
V7 III Stone
V50
Griso 1200SE Tenni (yeah, I should have kept it)
Breva 1100
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Offline fossil

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Re: V7III head shake
« Reply #34 on: January 28, 2019, 08:31:13 AM »
Dropping the forks through the yokes will decrease the trail and will reduce stability.
Pete

Yes, I know that. But nevertheless the bike is more controllable. Of course this may result to a big part from the fork job (cleaning, new springs, valves, oil) together with the working-over of the steering head (which I also had done). But the bike reacts calmer to longitudinal ridges now. Of which there are a lot on the back roads I ride.

The steering is quicker. But there is more feedback from the front. And this is exactly what I experienced riding the III. I look forward to reports from those who have both in their garage, like Kev M.
« Last Edit: January 28, 2019, 11:07:57 AM by fossil »
Greetings from Germany!
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Offline travelingbyguzzi

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Re: V7III head shake
« Reply #35 on: January 28, 2019, 08:58:24 AM »
I am in Rocker's camp on this. While R\R crossings are generally much smoother than they were 30 years ago, they are still one of the biggest hazards that we don't discuss much. It they are not square with the road or at all damp, steel rails do not offer much traction. I have also had some pucker moments on steel cattleguards.
The fact that the event happeded WHILE crossing the tracks should be considered.
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