SHAKEY FRONT

[SMUDGER44]

HI SEEM TO REMEMBER SOMETHING ABOUT THIS ON ANOTHER THREAD, JUST GOT BACK FROM A LITTLE TRIP (WONDERING IF IT IS TO DO WITH WHEIGHT ) AS MY MISUSE WAS ON HER BIKE I ONLY HAD A TOP BOX ON , WHEN I SLOWED DOWN TO SAY 40- 35 AND LET GO OF THE GRIPS THE FRONT END SHOOK SO MUCH IF I HADN'T GRABED THEM QUICK AND HARD I THINK I WOULD HAVE COME OF.
THE BIKE IS ONLY 5 MONTHS OLD, AND TIRE PRESURE IS CORRECT.
WHILST RIDING NORMALLY AS ALL US BB OWNERS DO THERE IS NO PROBLEM AT ALL.
ANY INFO PLEASE.
THANKS

 

[nedkelly]

It's just the weights on your wheels. I had the same problem with my Bird. I got a shop in Cork City in Ireland to fit Pilot Sports, and they took the bike for 8 hours, and phoned me at the end of the day saying they hadn't had time to fit the tyres. I lost the plot and got cranky on the phone, and within 15 minutes the owner rang back saying the tyres had been fitted. He never balanced the weights, and let me out on the bike.

I got the wheels balanced by him a week later (I work mon-fri, could only get in each sat), and the bike was fine ... until I put my Givi Topbox on.

With the top box on, or with a passenger, she'd just threaten to slap if I left go of the bars and the same speeds as you, between 30-40mph. She got very violent, and just complained as much as possible. I left the box off until I got new tyres the following month (Damn pilots don't last long .

Get your wheels balanced again. Mine read perfectly balanced on the shops jig (I saw the weights being added), but she just wasn't right.

Ned aka Rimmer.

 

[rev3]

AVON SHAKEY FRONT

I fitted a set of avon av35 front and av46 rear,what a mistake the front now as no feeling and shakes it head without provication at any thing below 40 mph and it does not matter wether I am two up or not.I have had the wheels rebalanced and the disc,s checked and every thing is okay.The original dunlop 205,s and the bt020,s never did it so it must be the tyres.It can not be wear and tear because the bike as only done 10,000 miles.
I had a cbr 1000 fp that did this but only when you was two up with luggage no matter what tyres was fitted.
I for one will never fit avon,s to the blackbird again????

 

[Inspector]

It's the top box

I think what people are trying to say is that yes if the tyres are not balanced then it will wobble but with the bike in shape with balanced tyres you will still get a wobble at slow speed if you have a heavy-ish top box. I have a Givi 52ltr and when full it does make the front light and wobbly at SLOW speed only, best not to let go of the bars anyway !!

 

[Bucks02]

Its the catseyes

I got 5000 miles on original BT57's front and back. (don't tell plod about the rear tread). Its an 02 model and steering shakes started around 2000 miles - approx when the front tire started to show fish scaling.

During a long trip thru Europe I analysed the occurances and found they only occur when in 6th gear and with speed dropping from 48 to 40 mph. Either side of this speed and in any other gear there is no steering shake. Smooth or rough roads made little difference. Its not there at all with the hands on the bars.
Keeping 42 psi up front minimised the trouble. Seat bag on or off made no difference too.

Theory says it cannot be wheel/tire balance as this would worsten as speed increases and would be felt thru the bars. I concluded therefore it had to be tire wear and engine torque-speed relayed.

I solved the problem by doing my body and arm stretching in 5th, or ar higher speeds!!!!!!

 

[DB on CBR1100XX]

It's the norm.................

..............they all seem to do it at around 40mph with a box or rear weight on. Minimised by newish tyres at 42 psi but almost always OK one up.

 

[andy1100xx]

Only noticed it with top box/panniers on at the same speed (50-40mph) and only when slowing down. Did it on my old 207's and on my new 010's.
Without the luggage she's fine.