Headshake - TwoWheelForum: Motorcycle and Sportbike forums
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post #1 of 21 (permalink) Old 02-17-2007, 04:27 PM Thread Starter
 
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Headshake

For the last month, when I let go of the bars the bike gets bad headshake. I used to be able to let go of the bars at any speed without the slitest movement. I do not have a stabilizer. Would a worn front tire cause this problem. The front tire has a little over 10,000 miles on it. It still has enough tread to last a few more weeks, but it is pretty worn. Could this be the problem?
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post #2 of 21 (permalink) Old 02-17-2007, 04:30 PM
 
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yes, specially if there's any un even wear. But I think someone else mentioned something about a worn bearing in the front could cause this also. You'll want to check that while the front wheel's off also.
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post #3 of 21 (permalink) Old 02-17-2007, 05:07 PM
 
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Many many factors. Rear wheel alignment plays a huge part as well. Is your front tire cupped at all? Check your tire pressure. Suspension has alot to do with it, made any shanges lately?
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post #4 of 21 (permalink) Old 02-17-2007, 07:01 PM
 
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tire balance can cause it too
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post #5 of 21 (permalink) Old 02-17-2007, 10:50 PM
 
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the old tire must go regardless. i get the feeling that will be as far as you need to go.
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post #6 of 21 (permalink) Old 02-17-2007, 11:53 PM
 
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ya, first thing you should look at is what is connecting you to the road.

go get some new PP's and see if the problem is still there.
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post #7 of 21 (permalink) Old 02-18-2007, 11:04 AM
 
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You used the majik phrase, now here comes the cult.
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post #8 of 21 (permalink) Old 02-18-2007, 12:26 PM
 
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You used the majik phrase, now here comes the cult.

*ques evil cult music*
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post #9 of 21 (permalink) Old 02-18-2007, 01:51 PM
 
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Quote:
Originally Posted by JK_DILLA View Post
the old tire must go regardless. i get the feeling that will be as far as you need to go.
Plus it's good to start with the cheapest thing.
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post #10 of 21 (permalink) Old 02-18-2007, 06:01 PM
 
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pilot powers rock!
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post #11 of 21 (permalink) Old 02-18-2007, 07:52 PM
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Also, be sure to check your steering head bearings.

Larry

Rarely is the question stupid, but sometimes the answer is you need to run everything you read online through your own personal BS meter to determine if it makes sense to you.
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post #12 of 21 (permalink) Old 02-18-2007, 09:13 PM
 
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Quote:
Originally Posted by metalmaster1310 View Post
The front tire has a little over 10,000 miles on it. It still has enough tread to last a few more weeks, but it is pretty worn. Could this be the problem?
Are you kidding? By 5K, my front tire has no thread on the side and shadow-thread in the center.

Quote:
Originally Posted by larryg View Post
Also, be sure to check your steering head bearings.

Larry
Yeah, Larry, I've always had a centerstand on my bikes, so it's easy to check my steering bearings for play, tightness, or rough spots. My 79 Suzuki has tapered bearings and I installed a zerk fitting. But how does one check steering bearings without a centerstand? Or even if they have stands? Do they just torque them to specs? Thanks.
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post #13 of 21 (permalink) Old 02-18-2007, 11:55 PM
 
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Pilot Power or Die.





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post #14 of 21 (permalink) Old 02-19-2007, 12:30 PM
 
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If headshake was not previously an issue, in order of likelihood:

Front/rear Alignment (Improperly aligned after chain adjustement, or dropped/damaged)

Tire Pressure

Steering Head/Triples Too Tight or misaligned

Mismatched Front/rear tires (you didn't say if you had replaced the rear and not the front)

Tire Wear

Tire Balance

Steering head bearings worn/dimpled

Wheel Bearings worn

These are the most likely scenarios, please note that the first three require nothing more than a little checking to fix. Most are easily done for little cash, including bearings. Tire wear/mismatch would be the most expensive. My guess would be a combination of worn front, mismatched rear and a little steering head wear, and mebbe some tire pressure issues. A little bit of each can throw the whole ballgame off. Fix most and the problem may go away; unless the front is badly cupped.
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post #15 of 21 (permalink) Old 02-21-2007, 03:51 PM Thread Starter
 
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Took the bike down to get a set of Pilot Powers put on. Once I got to feeling on the front tire, it was badly worn on the left side. So hopefully that was my problem. Wont know till I get the bike back and get some riding in.
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post #16 of 21 (permalink) Old 02-22-2007, 07:32 PM Thread Starter
 
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Got the bike back today and no problems with headshake. Just a worn out tire. The bike steers alot sharper with the pilot power. The new pilot is a 120/70e17f. The stock Bridgestone BT014 was a 120/65.
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post #17 of 21 (permalink) Old 02-23-2007, 12:05 AM
 
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Quote:
Originally Posted by metalmaster1310 View Post
Got the bike back today and no problems with headshake. Just a worn out tire. The bike steers alot sharper with the pilot power. The new pilot is a 120/70e17f. The stock Bridgestone BT014 was a 120/65.
Wait till you bang through the twisties on those PP's. You'll never want another tire.



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post #18 of 21 (permalink) Old 02-23-2007, 06:25 AM Thread Starter
 
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Just with the little bit of riding I got to do yesterday, there was a huge difference. The bike turns into corners with little effort. It took a little time for me to get used to it, because I was used to the bridgestones, I kept turning into the curves to soon.
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post #19 of 21 (permalink) Old 02-23-2007, 04:33 PM
 
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i moved to a 70 series front as well. Muuuuuuuuuuuuuuuch better on its side. You may want to experiment with raising the fork tubes in the triple clamps incrementaly (mm by mm) till you get your steering just right. Its a taller tire and will change geometry. But if your good then enjoy the PP's-
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post #20 of 21 (permalink) Old 02-26-2007, 12:59 AM

 
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Night and day difference, huh? I usually at best get about 5000 miles on a front and 3000 miles on a rear (on the 750) and even less on the 1000. The only bike I used to have that did that many miles on a set of tires was an EX-250 (1996).
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