High speed shakes- HELP! - Yamaha FZ6 Forums - International FZ6 Motorcycle Community Forum

Cuba · 07-16-2008, 12:48 PM

I have an 07 bought from a very reputable dealer used with 3K miles on it. It has never been down, it's mint, inspected every inch before purchase, no scratches, looked brand new, new rubber, fluids, immaculate.

At high speeds (120+) it starts to shake. It gets pretty bad, like about to tank slap kind of bad. It seems to have gotten worse, I maxxed it out when I first bought it about two months ago and it was shaking but not this bad and I was going a lot faster. Could I have lost a weight on the front wheel? That's all I can think of, as I said it's definitely not the frame. What do you guys think? Just go in for a balancing?

bmccrary · 07-16-2008, 12:52 PM

Quote:

Originally Posted by Cuba

I have an 07 bought from a very reputable dealer used with 3K miles on it. It has never been down, it's mint, inspected every inch before purchase, no scratches, looked brand new, new rubber, fluids, immaculate.

At high speeds (120+) it starts to shake. It gets pretty bad, like about to tank slap kind of bad. It seems to have gotten worse, I maxxed it out when I first bought it about two months ago and it was shaking but not this bad and I was going a lot faster. Could I have lost a weight on the front wheel? That's all I can think of, as I said it's definitely not the frame. What do you guys think? Just go in for a balancing?

Yea I think its just the way you have the bike loaded. Where you leaning back on the bike any?

Check your stearing head bolt, make sure its tight. Also, check to make sure the pinch bolts are tight on the front axle.

Try stiffening up the rear shock as well.

The main way to keep it from happening, it just not to go that fast....lol.

-bryan

**jsteinb95** · 07-16-2008, 12:56 PM

Quote:

Originally Posted by bmccrary

The Main Way To Keep It From Happening, It Just Not To Go That Fast....lol.

-bryan

Amen!!!!!!!!!!!!!

Mr T · 07-16-2008, 01:04 PM

I have an 06 with 3000km and experienced front end wobble. I have changed the tyres to Pilot Powers 2CT and installed dyna beads. I stripped and regreased/replaced the steering head bearings. Went for a ride on Sunday and the problem is gone. I didn’t push limits as the tyres still have moulding wax on them. There is a 100% improvement in the handling.

T

oldfast007 · 07-16-2008, 01:28 PM

My first guess would be tire balance, 2nd, tire wear, cupping etc, and as mentioned head bearing, axle etc. Good luck!

DefyInertia · 07-16-2008, 03:44 PM

something is definitely off; this is not normal or OK. check your wheel alignment and the head bearing for sure.

my bike is rock solid at 140MPH+ (track)

Quote:

Originally Posted by jsteinb95

Amen!!!!!!!!!!!!!

Is that what you tell sportrider?

**sportrider** · 07-16-2008, 04:27 PM

most likely it's your tires are out of balance, the rear tire can cause a wobble also so have them both done. I had a wobble like that once and it turned out that the rear tire was a 1/2 oz out. that fixed my problem. I did go through the entire bike and checked the torque on everything. at first I didn't think it would be the tires because I had just mounted them and had them balanced (by 10west big surprise) after everything else checked out ok I pulled the wheels again and had them re-balanced thats when I found out they messed up the first time.

Cuba · 07-17-2008, 07:35 AM

Thanks for the replies guys, Yes I know I shouldn't go that fast... but I live in an area where there are many great trafficless roads and straightaways with very high visability and no cross traffic/intersections, so... less risky than you'd assume.

The tires were new- I've put 1300 miles on them, and I think my suspension may need to be tightened a bit. I'm 165lbs, what would be an optimal setting for me?

I'm going to take it to the shop where I bought it soon, see if they'll at least discount the work since it was a recent purchase, we'll see.

Thanks again!

**reiobard** · 07-17-2008, 07:37 AM

Quote:

Originally Posted by Cuba

The tires were new- I've put 1300 miles on them, and I think my suspension may need to be tightened a bit. I'm 165lbs, what would be an optimal setting for me?

For your weight i would put it on 5 or even 6. try 5 and see but then go another if you want stiffer, what is it on now? the stock 3 setting?

Cuba · 07-17-2008, 01:30 PM

I had to go out back and check... and forgot my key so I couldn't really see the number. Seems to be in the middle. I'll put it on 5 when I clean and lube the chain this weekend, do a run and see if it helps. If not I'll have the service guys check the balance. Thanks

07-16-2008, 12:48 PM	#1 (permalink)
Cuba Junior Member Join Date: Jun 2008 Location: PA Bike: 2007 FZ6 Posts: 260 Rep Power: 4 Member #3081	High speed shakes- HELP! I have an 07 bought from a very reputable dealer used with 3K miles on it. It has never been down, it's mint, inspected every inch before purchase, no scratches, looked brand new, new rubber, fluids, immaculate. At high speeds (120+) it starts to shake. It gets pretty bad, like about to tank slap kind of bad. It seems to have gotten worse, I maxxed it out when I first bought it about two months ago and it was shaking but not this bad and I was going a lot faster. Could I have lost a weight on the front wheel? That's all I can think of, as I said it's definitely not the frame. What do you guys think? Just go in for a balancing?

07-16-2008, 01:04 PM	#4 (permalink)
Mr T Junior Member Join Date: Jan 2008 Location: East Coast of Africa Bike: FZ6 Fazer Posts: 37 Rep Power: 4 Member #1157	Re: High speed shakes- HELP! I have an 06 with 3000km and experienced front end wobble. I have changed the tyres to Pilot Powers 2CT and installed dyna beads. I stripped and regreased/replaced the steering head bearings. Went for a ride on Sunday and the problem is gone. I didn’t push limits as the tyres still have moulding wax on them. There is a 100% improvement in the handling. T

07-16-2008, 01:28 PM	#5 (permalink)
oldfast007 OU812 Join Date: May 2008 Location: NH Bike: Fastest Red 06' Posts: 213 Rep Power: 4 Member #2741	Re: High speed shakes- HELP! My first guess would be tire balance, 2nd, tire wear, cupping etc, and as mentioned head bearing, axle etc. Good luck!

07-16-2008, 04:27 PM	#7 (permalink)
sportrider Freeway Assassin Join Date: May 2007 Location: Redlands Ca.(can't see hell anymore) Bike: 2007 Yamaha YZFR1 Posts: 2,662 Rep Power: 10 Member #127	Re: High speed shakes- HELP! most likely it's your tires are out of balance, the rear tire can cause a wobble also so have them both done. I had a wobble like that once and it turned out that the rear tire was a 1/2 oz out. that fixed my problem. I did go through the entire bike and checked the torque on everything. at first I didn't think it would be the tires because I had just mounted them and had them balanced (by 10west big surprise) after everything else checked out ok I pulled the wheels again and had them re-balanced thats when I found out they messed up the first time. __________________ My Rider Resume America LOVE it or LEAVE IT former FZ6 test rider much of the action depicted here could rip your limbs off if done improperly.the riding discussed is done by an experianced rider in semi-controlled conditions, save the speed for the track. ride within your capibilities, concentrate and always wear protective gear, including a helmet, gloves, jacket, pants, and boots. I and the forum, forum staff, any combination of the words, forum, staff, thread, post, website, internet or member, are in no way responsible if you ride over your head and wad yourself up trying to recreate something you've read here.

07-17-2008, 07:35 AM	#8 (permalink)
Cuba Junior Member Join Date: Jun 2008 Location: PA Bike: 2007 FZ6 Posts: 260 Rep Power: 4 Member #3081	Re: High speed shakes- HELP! Thanks for the replies guys, Yes I know I shouldn't go that fast... but I live in an area where there are many great trafficless roads and straightaways with very high visability and no cross traffic/intersections, so... less risky than you'd assume. The tires were new- I've put 1300 miles on them, and I think my suspension may need to be tightened a bit. I'm 165lbs, what would be an optimal setting for me? I'm going to take it to the shop where I bought it soon, see if they'll at least discount the work since it was a recent purchase, we'll see. Thanks again!

07-17-2008, 01:30 PM	#10 (permalink)
Cuba Junior Member Join Date: Jun 2008 Location: PA Bike: 2007 FZ6 Posts: 260 Rep Power: 4 Member #3081	Re: High speed shakes- HELP! I had to go out back and check... and forgot my key so I couldn't really see the number. Seems to be in the middle. I'll put it on 5 when I clean and lube the chain this weekend, do a run and see if it helps. If not I'll have the service guys check the balance. Thanks

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