TOPIC:

Hi I have something that bugs the hell out of me.
When racing my friends or passing cars on the highway I often get a slight wobble (normally this happens at above 130kmh).
I do not want to tempt faith so I always let of the throttle and lean forward some more, often I can start pulling again without the wobble then.
But still it really sucks, for one when doing a pass it could be a lot longer than anticipated because of this and then we have the male pride when racing my friends.

Everything checks out in my opinion, both tires are new the shocks seems to work okay and so on.

What is a sure way to rectify this?

Best regards H

Bad steering stem bearings & swingarm bearings can create a high speed wobble
Pete

The new tires may not be seated properly or a tire may have a problem i the carcass. I chased a very similar problem on my bike and it turned out to be tire related even though they looked great and were high quality (Michelins). Ed

Warped rotor, or, wheel wheel/wheels need balancing

Front/rear wheels aligned? Has bike ever been laid down?

mine was corrected with installing tapered bearings in the neck and you can always add a steering damper. the new style bearings make a huge difference.. just my 2 cents

I copied this from a post from Jeff Saunders (owner of Z1 enterprises)

Motorcycle Wobble Causes

There's a LONG list of potential area that can cause this.

These are not in any particular order

Wheel bearings

Steering bearings - repack grease, check tightness

Swing arm bushings/sleeves/bearings - replace if worn, repack grease

Fork springs aging - check spring length

Unequal fork oil - if seals leak, then your damping can be ineffective

Rear shocks aging, damper leaks - if you have oil leaking from the seals, the damping is toast.

Worn Tires/Mismatched tires/tire pressures/wrong size tires
Wheel alignment - don't trust the chain adjusters - I visually align the wheels.

Bent rims/broken spokes - get the wheels off the ground and spin them - check for runout / damage

Front disc warped - check for runout

Steering & swing arm bearings are very common problems, but so are tire issues (pressure/mismatch) and wheel alignment.

Not having a front fender, as it helps stiffen up the forks. I’d suggest a fork brace.

Nice, MFolks, that should just about cover everything !!
Pete

Out here, all the highways have the rain grooves cut in them that make the front wheel wobble depending on the tread pattern of the tire. I chucked the original tire it shook so bad.

The only time I've encountered this it was mismatched tyres: both decent tyres they just didn't like each other - and yes, it is very alarming.

Okay sounds like I have some real troubleshooting to do
I have replaced the rear wheel bearings,
Both tires are the same brand (Dunlop arrowmax) not that it guarantees anything.

I will take a look at the forward shocks and look over my pieced together Marcossis in the rear.
(I am trying to find parts for them since my fix will not last)
The piston is pitted bad so it is only a matter of time until it shears my new seals.

The bike has probably been laid down at one point, I recon from driving away on the side stand.
(side stand mounting bracket is tilted upwards so I have my shifter set way high since I am hitting the side stand while downshifting otherwise,)
And lower frame tube seems to have a banana shape as well.

I will take care of the frame when winter hits among other things (the plan is to give her a good overhaul then)

The wheels alignment is set whit a straight ladder, (what we could find at that time that was long enough.)

BTW since I will probably find a lot of broken parts here (if PO has worked on it)
What is considered good upgrades suspension vise?

For example if I find that PO have filled the forks with sand? (I would not get surprised to be honest)
I would rather update the forks than refurbishing the stock ones.
The same goes for everything else on the bike.

The tapered bearings are noted and will probably find its way to my bike
But I would like the numbers on those bearings, (For example a 6302)
Reason being that I have a contact that can get me just about any bearing for dirt cheap if I have the numbers.

Best regards H

I'll add tire pressure to the list. I have found that if my tire pressure is too high, stability issues occur particularly at high speed.