Wobble

Knackered tyres, isolastics, swing arm bushes, forks, steering head bearings (very unlikely but possible) etc etc

One thing to check is that the swinging arm is not contacting the bolts/studs that hold the pillion footrest/silencer onto the machine. Ive see loads of commandos that show that contact has been happening in this area, wearing a nice groove in the swinging arm usually on the drive side. Oddball isolastic replacement especially at the front, throwing the swinging arm over to one side or the other along with clapped out bushes doesn't help.  

Peter forgot to mention the person holding the bars...

As for why right and not left, normal logic doesn't apply to Commandos; they do what they do. But if you'd like to define what constitutes a "sharp" bend, the speed at which you're going thru it and whether you are turning the wheel into the corner or counter steering, we can have a think about it. E.g. are you turning out of Tesco's car park at walking pace or going thru Governor's with your knee down?

Is it a disc model ? Has the front wheel ever been rebuilt ? If so, check that the offset is correct and that the rim is central in the forks.

Unless the forks are clamped at the straight ahead position, it is very easy to "align" the wheels with the bars slightly turned and this can result in a bike that is happier to turn one way than the other and fight back from the direction it's less keen on.

Have you checked anything on the bike? Do you do your own maintenance? Are you new to Commandos? To expect anything like an answer to your question we will need more information so we can discount some of the more obvious and common faults to these machines. Have you checked that the swing arm isn't contacting the silencer bolts? Depending on the type of isolastic rubbers fitted (we don't even know what year model commando it is) some of the earlier ones can move/migrate across the iso mounts. possibly creating an uneven/lopsided/handed fault.        

hello,

is there a bulge in one of the tyres. appears worse when tyres warm up.

barry

Ok,  I know that sensation. I'd describe it as a sort of yawing. More pronounced going downhill on the front brake. Sound about right?

If it is that then I think it'll be there on left turns as well, but the rider is having an effect. What to do about it? Well check those bearings, wheel alignment, fork alignment, fork oil level, tighten the wheel spindle and fork nuts, check for play in the fork legs. But it's one those Commando quirks. It's worse on an early 750. Too much front tyre - are you running a 4.10? Try a couple of psi more pressure. Has it only just started happening or has always felt a bit like this? Throw a new front tyre at it, especially if it's old 'cos tyres do wear out of shape, maybe a 3.60.

The first time i renewed the rear tyre on my Mk3 i discovered the PO had got the tyre lock between the tyre bead and the rim on one side. Couldn't tell riding it, even two up. Obvious when rotating the wheel and was the reason i renewed it. That is another thing to check on buying any second hand machine.   

Heady steady rubber broken on one side?

Or even the head steady Peter, if it is an early 750.

All of the above but add rear wheel spindle snapped, I had a stainless one fail in the late '90's that was on the bike when I bought it,. Noticeable when going onto the slip road from M27 heading onto M275, the slightest imperfection made the rear wobble.