HI
Update, so went to change primer cap, while the original grey cap was off i hooked up the fuel tank to check the needle action, and there is defo some sticking in the seat action doesn't take much to move it but hey it sticks in the seat and so changed primer cap to the new (non original) white one with integral primer.
Well now it was better, but not anything to write home about, maybe got 15meters of mowing out of it and died again. It will start again but just varying amounts of time running then dies still.
So I'm still thinking needle is the issue and it's just sticking even in the new primer cap, though bad light stopped play at this point.
As an aside I notice the jet screw has no 'groove' 'man':-) which it should have right? for an 85cc?? Anyway it ran well enough before so I've ordered needles and other stuff and can't find a 'Groovy' jet anyhow so when the needles arrive I'll let you know how it goes.
Here's a picture of jet screw head on new primer cap.
Theres also no little bit of gauze over the jet hole, I took the plastic tube out and there is no obvious taper to the hole either.
[Linked Image]