When I purchased this bike it’s had brand-new tires on it.Avons storms ....iam just not happy with the feedback and twitchiness.....or is it just me
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Twitchy tires
- Thread starter danny sparks
- Start date
Fast turn in or what you are calling Twitching has to do with your sag settings or the chassis ride height (which is the same thing). The front is too low or the rear is too high. Read up on how to adjust your pre-load adjusters . You may have too much air in the rear shock which raises the rear too much. In any case your chassis geometry is off. Raise the front to make it less twitchy.
Its not your tires because those are very good tires- I ran that bike on track days with those tires.
Its not your tires because those are very good tires- I ran that bike on track days with those tires.
What is twitchiness for some is responsiveness for others.
my last set of tires were the Storm variety. I was extremely pleased with their confidence in wet or dry, overall responsiveness when turning or over in a curve was terrific.
I had just done some work on the front end (full removal of forks/disassembly/new steering head bearings/etc - so that may have a lot to do with the overall outcome)
I also have the shock from a ZG1400 installed - so it sits about an inch+ higher.
I weigh about 200lbs and always have the side bags on with some assortment of stuff in them - to give an idea of load.
I wave just recently replaced the Storms with the Avon X-3D? again - really stable in use (initially thought the turn in was quicker but got used to it). !ad to replace them because I went to Cape Breton and rode the back roads extensively for a week - some really rough pavement mixed with pristine stretches - almost always over in a curve. I wore through the sidewalls!!! pictures of the cords for the asking!
I do notice the X-3D front seems to track tar strips a little to closely at times.
IMO those tires were a good set for me (1986 C10 180,000+ km)
Cal
I had just done some work on the front end (full removal of forks/disassembly/new steering head bearings/etc - so that may have a lot to do with the overall outcome)
I also have the shock from a ZG1400 installed - so it sits about an inch+ higher.
I weigh about 200lbs and always have the side bags on with some assortment of stuff in them - to give an idea of load.
I wave just recently replaced the Storms with the Avon X-3D? again - really stable in use (initially thought the turn in was quicker but got used to it). !ad to replace them because I went to Cape Breton and rode the back roads extensively for a week - some really rough pavement mixed with pristine stretches - almost always over in a curve. I wore through the sidewalls!!! pictures of the cords for the asking!
I do notice the X-3D front seems to track tar strips a little to closely at times.
IMO those tires were a good set for me (1986 C10 180,000+ km)
Cal
I had the storm on mine before I switched to 17" and PR4s, was happy with the contact with the road, wet or dry but wear faster than other "harder" tires.
Do you know how many miles are on them?
Mine wore a little funny on the rear and started to get a little hopping issue in the rear tire at half treadwear.
I think you have to describe twitchiness a little more and give conditions when you feel it, speed, riding conditions, curves, highway, etc
You may want to get the tire raised off the ground and give it a spin by hand to see if you can see any issues with runout, axially or radially or any other noticeable issues.
Do you know how many miles are on them?
Mine wore a little funny on the rear and started to get a little hopping issue in the rear tire at half treadwear.
I think you have to describe twitchiness a little more and give conditions when you feel it, speed, riding conditions, curves, highway, etc
You may want to get the tire raised off the ground and give it a spin by hand to see if you can see any issues with runout, axially or radially or any other noticeable issues.
I have so far fitted a c14 rear shock replaced all the linkage bearings .fitted yss front fork Valves also increase the spaces to get preload on the forks...all other bearings checked and greased.iam starting to think that it might be the rear ride height.Altering the rake on the forks...so maybe a lowering kit is next....this Bike had 101 issues when I got it but slowly but surely I’m working through them...
As for the bike being twitchy it just feels uneasy when overtaking large lorries ...and also when on the overrun when slowing down...it’s fine when running flat out up to about 120mph...just Cruising it has issues ...it goes around corners great...
I mentioned that I had done the head bearings - which initially felt fine but I eventually began to feel a wobble around 60-70 km/h mark that required both hands on the bars for acel or decel (usually the speed I am using left hand to drop the helmet visor!!!)
once I tightened down the bearings an 1/8 to 1/4 turn all wobble was gone and I could relax when riding again.
I would like the rear to be back down to 'normal' ride height since I added the ZG1400 shock - but have yet to find a lowering kit that seems to work without other issues being mentioned by the group.
maybe I have acclimatized to the added rear end height. certainly contains my and my wife of 35 years added baggage without issue :'(
Cal
once I tightened down the bearings an 1/8 to 1/4 turn all wobble was gone and I could relax when riding again.
I would like the rear to be back down to 'normal' ride height since I added the ZG1400 shock - but have yet to find a lowering kit that seems to work without other issues being mentioned by the group.
maybe I have acclimatized to the added rear end height. certainly contains my and my wife of 35 years added baggage without issue :'(
Cal
Danny sparks said:
Well heck- the word twitchy can be many different things- this time it means something totally not what I would have thought.
I think over here on this side of the pond we would call what your describing as 'dirty air' where as the wind coming off of a truck when passing will buffet the bike.
I thought these bikes where good and stable in dirty air due to their weight and aerodynamics. I don't think tires or preload has a whole lot to do with buffeting.
Maybe take a light weight 250cc bike and pass a few trucks to get used how much worse it is on those bikes. Then you will love the GTR
What happens after 120? Flat out here is about 170mph?
I agree the stock C10 will experience some/a lot of buffeting in dirty air. I think the stock windscreen adds to this.
Check your motor mount bolts too.
When I got my bike I had very bad wandering in dirty air (felt like riding on marbles)when passing trucks on the highway ended up that my lower engine mount bolt was sheared off.
Check your motor mount bolts too.
When I got my bike I had very bad wandering in dirty air (felt like riding on marbles)when passing trucks on the highway ended up that my lower engine mount bolt was sheared off.
yes you could be right with dirty air....But as for aerodynamics it reminds me of a melted wellyDaytona_Mike said:
Cycle World reported the top speed of a C10 was 125mph. You must have a very special Concours.Daytona_Mike said:
Danny, a friend of mine had the 3D-XM's on his Connie.
When he would pull up behind a truck the rear would squirm so badly I could see it while riding behind him.
He tried various things, but eventually got rid of the tires and the problem went away.
On your C-14 shock, adding a Norm Soucy Lowering Rocker will set the bike at whatever height you want.
The rockers are made in various heights.
I think most use a 1 1/2 rocker.
Ride safe, Ted
When he would pull up behind a truck the rear would squirm so badly I could see it while riding behind him.
He tried various things, but eventually got rid of the tires and the problem went away.
On your C-14 shock, adding a Norm Soucy Lowering Rocker will set the bike at whatever height you want.
The rockers are made in various heights.
I think most use a 1 1/2 rocker.
Ride safe, Ted
C_R
"On your C-14 shock, adding a Norm Soucy Lowering Rocker will set the bike at whatever height you want.
The rockers are made in various heights.
I think most use a 1 1/2 rocker."
got anything more specific like a link on that? last I read I thought those lowering kits were for the original shock - and the 1400 shock spring got in the way.
Cal
"On your C-14 shock, adding a Norm Soucy Lowering Rocker will set the bike at whatever height you want.
The rockers are made in various heights.
I think most use a 1 1/2 rocker."
got anything more specific like a link on that? last I read I thought those lowering kits were for the original shock - and the 1400 shock spring got in the way.
Cal
Yeah, I thought this was a C14 forum so wrong bike.GeorgeRYoung said:
I had my old C10 up to 135mph but that was all it had
Norm's 1.5 inch lowering rocker puts the back end very close to stock. Iffin' ya can find one it's
the best solution I found with the C14 rear shock. The center stand binds on the suspension if you
don't stand it upright before deploying it, but that's no real bother. As mentioned, the adjustable lowering
Links are no go with a C14 shock... the spring is too wide and hits the links
If you've recently done work to the steering stem, go back and check it if you haven't done so.
As time passes, things compress a bit, leaving enough to make buffeting tedious. I did mine 3x
before I got it right.
New Avon 3D-XMs are twitchy to me, but only until they wear a bit, then they're a super stable tire.
the best solution I found with the C14 rear shock. The center stand binds on the suspension if you
don't stand it upright before deploying it, but that's no real bother. As mentioned, the adjustable lowering
Links are no go with a C14 shock... the spring is too wide and hits the links
If you've recently done work to the steering stem, go back and check it if you haven't done so.
As time passes, things compress a bit, leaving enough to make buffeting tedious. I did mine 3x
before I got it right.
New Avon 3D-XMs are twitchy to me, but only until they wear a bit, then they're a super stable tire.
Norm's 1.5 inch lowering rocker puts the back end very close to stock. Iffin' ya can find one
Some time back, I located and contacted Norm. He's still making the links.
I'll try to find the info on how to reach him. See next post.
On the other Forum there is a discussion about high speed wobble. The solution was to replace a defective rear 3D XM.
Ride safe, Ted
Some time back, I located and contacted Norm. He's still making the links.
I'll try to find the info on how to reach him. See next post.
On the other Forum there is a discussion about high speed wobble. The solution was to replace a defective rear 3D XM.
Ride safe, Ted
Norm Soucy Lowering Rocker info from old discussion;
I thought that the Lowering Rocker that Norm Soucy made {for the C-10} was no longer available.
So I located him. :great:
{Has the 1 1/2" in stock} Said he can make different heights.
(He now puts new bearings in all Lowering Rockers and sells them for $200)
We briefly discussed the use of his Lowering Rockers and Longer shocks.
I told him, that people would be interested in his Lowering Rockers because of installations of C-14 (or other) shocks.
He estimated that;
A C-10 (with a C-14 shock and his 1 1/2" Lowering Rocker), the bike would set 1/2" lower than stock.
A C-10 (with a C-14 shock and his 1" Lowering Rocker), the bike would set the same height as stock.
If this is of interest to anyone , contact him.
Here is his up to date info: sanleonster@gmail.com
phone# (281) 339-1156
Ride safe, Ted
I thought that the Lowering Rocker that Norm Soucy made {for the C-10} was no longer available.
So I located him. :great:
{Has the 1 1/2" in stock} Said he can make different heights.
(He now puts new bearings in all Lowering Rockers and sells them for $200)
We briefly discussed the use of his Lowering Rockers and Longer shocks.
I told him, that people would be interested in his Lowering Rockers because of installations of C-14 (or other) shocks.
He estimated that;
A C-10 (with a C-14 shock and his 1 1/2" Lowering Rocker), the bike would set 1/2" lower than stock.
A C-10 (with a C-14 shock and his 1" Lowering Rocker), the bike would set the same height as stock.
If this is of interest to anyone , contact him.
Here is his up to date info: sanleonster@gmail.com
phone# (281) 339-1156
Ride safe, Ted
connie_rider said:
Thanks Ted! You da man! My shock went in back in 7/2014, so my recollection
Is sketchy. I now know I used a 1.5 in ( I looked back at the thread) for certain.
The C-14 shock with the 1.5in rocker has put the bike's rear height back to the OEM
shock's height w/ 7 clicks on the adjuster. I have it all written down in the back of my
shop manual from the install... I go to 15 clicks 2 up.