Give your head a shake

[pasophist]

Hello my friends-

My 750 Paso is shaking its head. I say go straight and its head shakes "no".

Starting at perhaps 60kph, it wants to be unsteady. Perhaps the front wheel is a little bent. These wheels are very soft and even a little impact will bend them somewhat.

But I think maybe there is another reason. have you any ideas as to what it could be?

Thank you,

SMS

[ducapaso]

maybe it's just unbalanced.
Motorcicle wheels have a "static" balancing, instead of automotive ones and their "dynamic" balancing.
First of all, remove the wheel and have a look to the bearings and to the brakes, then you can go for the "static" balancing...
It means that you need a stand to put the wheel free to spin and just move it for one or two laps...
The heavier part of the wheel will stop in the lower part: try once or twice to find the exact point!

[persempre907]

There also are many reasons, as the rear tire worn, a bad alignment beetween the wheels, a bad regulation of the fork, ...

I think a little bend of the wheel is an unlikely reason.

Ciao

[jcslocum]

Has any work been done to the bike recently??

Adjust the rear shock? Raise the rear height? Drop the front?

[Desmo_Demon]

You may also have some bad steering head bearings. To check these, raise the front end off the ground by setting some jack stands under the front section of the frame. This will leave the front end completely free for inspection. You then can grab the forks near the axle and move them front-to-back. If there is excess wear, you may be able to get away with just tightening the bearings, but chances are, the bearings are bad and need replacing.

[paso750]

the simplest reason could be a loss of airpressure in the front tire.

G.

[persempre907]

the simplest reason could be a loss of airpressure in the front tire.

G.

I forgotten!

Such thing happened to me too.

Ciao

[pasophist]

MORE INFORMATION-

I took the Paso out yesterday to see what was going on. First I rode it as is. The result was that I learned the head shake occured while throttle off. Did not occur while accellerating! I thought that valuable information to work with.

I figured suspension set up might play a part in that since the headshake seemed to occur in nose down or neutral situations but not in nose up situations (acccellerating).

I increased teh front fork rebound a couple of clicks and took her back out but noticed no difference. Then I looked at the rear:

The rear suspension was set up with maximum preload and the pneumatic reservoir was set at "0". I set the reservoir to "5" to see if there would be any change.

The result was that the head shake became much worse- and occured on accelleration too.

Does that hint at anything?

SMS

[ducapaso]

I still think that suspension aren't so important in your trouble.
A softer mono response will just increase (as it's happening to you!) the front shaking and the neutral run shows you it's not a matter of engine.
The beginning at60 kp/h make me think to an unbalanced wheel. Was it standin fro a long time before the shaking?