Run the back wheel up on a 1" - 1.5" block of wood. That helps if the bike has been lowered, should help even if it hasn't?
It's a bit of an art to get the bike up on the centre stand, but shouldn't take much more that your weight & a bit of a pull.
Hold the bike upright with the left hand on the bars & the right hand on the pillion grab rail. Push the centre stand down, with the right foot, until you feel it touch the ground then, with your right foot still pushing the stand down, rock the bike (gently) until you can feel both centre stand feet touching down.
When you've got it like that put all your weight on the stand & pull/lift backwards with your hands. Your left foot can come off the ground as the bike will balance on the stand while you're lifting. 

the lambda sensor has all ready been cut by a previous owner was told it was done by a previous owner to the one who sold me the bike it runs and then farts and loses power so it feels like it could be the seals but I just thought I was a good idea to do all of them while I was there but I literally can't get her on to the centre stand    I am working my way through the problems one at a time

It's fairly unlikely that the crush gasket into the rear cylinder head is leaking, unless you have a reason to believe that's the case then I would leave that one well alone. The usual culprit for exhaust leaks is the sleeve gasket between that header and the collector pipe, usually because the welded on exhaust clamps have rotted away. This allows fresh air in before the lambda sensor and so the bike runs crazily rich. Make sure you smear a generous amount of assembly paste on that gasket, I also found it helpful to jack the collector pipe up with a block of wood to make sure that connection was fully seated. If the clamps are gone, or look less than ideal, then swapping them out for stainless ones is a worthwhile expense. I can find out the size I used if you need them.

I did just check and the bones are 140mm

I saw my Anakee III's were down on the limit markers last week so I'm going to change to 'Roads' as I don't do much more than a bit of grass or tracks at best as an adventue!

I changed to A III's in 2015 when my Trail Wings (the rear precisely) punctured on a French motorway at 120 kpm. I'd just passed 6k kms on those original tyres. I replaced that set in 2018. My bike is now past 46k kms so the two sets have covered 40k; that's 20k each set or 12,500 miles!

I should have them fitted by the end of the week so I'll report back what I think they're like after 'rodage' or running them in as you would say.