pghzx14
Novice Class
Posts: 31
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posted May 14, 2011 02:32 AM
speed shake
Just got new tires on pirelli angels and I told the dealer to adjust my suspenion. So when going 100 plus mph the bars are shaking. wtf! Anybody have any ideas? I think maybe wheel balance or suspension adjustment?
  
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epd345
Pro
Posts: 1494
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posted May 14, 2011 03:09 AM
Probably a balancing issue, I have 5k on my Angels and they are still going strong. Always been rock solid from day one. Look for weights or lack there of on your wheels and then get them rebalanced.
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2012 ZX14, Ceramic Coated Brock's CT Meg, PCV, throttlemeister
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zxbob
Pro
Posts: 1692
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posted May 14, 2011 04:29 AM
Suspension shouldnt make it shake - have them (or someone else) re-check the wheel balance !
Bob
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Good parts aint cheap and cheap parts aint good !
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GREYHOUNDMOSES
Expert Class
Posts: 324
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posted May 14, 2011 06:16 AM
Take a look and see if the tyre bead is seated evenly (especialy the front). There should be some sort of
moulding mark around the sidewall close to the wheel rim. Check that the distance between the two is the
same all the way round. If it's not, take it back and "have words".
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INTIMIDA2OR
Needs a life
RED rider!
Posts: 13081
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posted May 14, 2011 09:50 AM
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'06 Passion Red ZX-14
*Lee*
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Hellmutt
Needs a job
Posts: 2013
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posted May 14, 2011 10:19 AM
Mine does it too but only well over 100mph and on the gas - but it's a "slow" shake if that makes sense.......the bars just float back and forth slightly, then when I chop the gas and the front makes full contact again, no shake or feel of one to speak of. So........I may be investing in a GPR or better yet........Ohlins damper
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British flying couch with endtables and an orange thumper
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INTIMIDA2OR
Needs a life
RED rider!
Posts: 13081
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posted May 14, 2011 11:47 AM
I had a head shake cause my last tire was wearing funny. But that was only on deceleration and only at about 50mph. Above or below that speed and there is nothing whatsoever.
My dad got run off the road a bit the other day and got into a huge pothole that put a massive dent on the front rim. The bike stays straight untill about 150mph then a nice tank slapper ensues!
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'06 Passion Red ZX-14
*Lee*
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joel787
Zone Head
Posts: 590
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posted May 14, 2011 03:25 PM
get a Steering damper...
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http://www.proe-pr.com/cnc.html
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Flame On
Needs a life
Fuel Air & Spark
Posts: 17104
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posted May 14, 2011 04:54 PM
Sounds like a wheel balance prob. Did you take it back to them.
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77 RD 400
80 GS1000 GT
06 ZX14
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dubious
Needs a life
Needs more time to ride!
Posts: 8442
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posted May 14, 2011 09:25 PM
a tire that is skimming along with next to no weight on it under power, will wander slightly , as it follows the tread patern.
reduce front fork preload to put more weight on the front tire.
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natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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INTIMIDA2OR
Needs a life
RED rider!
Posts: 13081
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posted May 14, 2011 10:18 PM
quote:
a tire that is skimming along with next to no weight on it under power, will wander slightly , as it follows the tread patern.
reduce front fork preload to put more weight on the front tire.
What he said!  
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'06 Passion Red ZX-14
*Lee*
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BobC
Pro
Posts: 1736
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posted May 14, 2011 11:46 PM
All of the above and check the wheel alignment too.
Also, if you haven't used these Pirelli's on a 14 before and it's suddenly shaking it could just be that they don't suit the bike.
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Candy Thunder Blue 2006 ZZR1400
Stock wheelbase
Max: 205.4 mph in 1.25 miles
2012 ZZR1400 in Golden Blazed Green
Brock CT Full System. etc
Max: 203.1 in 1 mile (so far)
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blackbullet76
Pro
Posts: 1134
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posted May 15, 2011 04:36 AM
 Edited By: blackbullet76 on 15 May 2011 12:38
I had shake after getting new tires put on. The guy who balanced them put the weight on the outer lip of the rim instead of using the center lip and it vibrated at around 50 or so mph. To test it, I took off the weight he put on and got some stick weights I had and split the difference and put them on each side of the center lip. Took it for a spin and that cleared it up almost, so I took it to another bike shop and had them rebalance the tire and told them to put the weight on the center lip. No problems after that.
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2007 ZX-14 black
Brocks s-meg exhaust
PCIII w/track map
BMC race filter
Flies removed
16 tooth front sprocket
Speedohealer
APE cam chain tensioner
Vortex rearsets
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eklipse636
Needs a life
ZX-14
Posts: 6046
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posted May 15, 2011 05:57 AM
You guys balance your tires?? I haven't had one balanced in a few years.
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Best: 60ft 1.351 1/8 5.68 mph 123.98 1/4
8.89 mph 151.32
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epd345
Pro
Posts: 1494
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posted May 15, 2011 06:10 AM
This will also help reduce your speed shake
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2012 ZX14, Ceramic Coated Brock's CT Meg, PCV, throttlemeister
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joel787
Zone Head
Posts: 590
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posted May 15, 2011 11:09 AM
get a Steering damper...
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http://www.proe-pr.com/cnc.html
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3000psi and falling
Zone Head
Posts: 848
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posted May 15, 2011 11:41 AM
Sure sounds like they forgot to balance the wheel. And like black bullet said about the weights being centered is true, our wheels were designed with the spokes offset to allow weights to be postioned in the center of the wheel for accurate balancing.
When I balance wheels on my bike I first find the heavy spot of the rim with my balancer then mount the tire with the dot lined up with the heavy spot, they almost never need weight and when you do need some its very little. I cant stand to see when some shop hand sticks a half dozen weights on a wheel instead of breaking the bead again and turning the tire on the wheel.
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08 ZX14, 2010 Persimmon Red bodywork.
Flies pulled, 16-42, BMC street, 8" extensions, drag shock, cut pan, Cycle Concepts Drag Pack and springs, muzzy m14 w/ oval can, lowered, Shinco usoft rear, pcv with autotune, leightweight Shori 18ah battery, throttle meister. 500lbs at bandimeres scales with half tank of juice.
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Darkforce
Novice Class
06 Tomahawk Cruise Missile
Posts: 51
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posted May 17, 2011 02:53 PM
Don't use wheel weights, use the dyna beads, they do all of the work !
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INTIMIDA2OR
Needs a life
RED rider!
Posts: 13081
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posted May 17, 2011 03:11 PM
quote:
Don't use wheel weights, use the dyna beads, they do all of the work !
+1
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'06 Passion Red ZX-14
*Lee*
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