Yes, of course I was heating the exhaust section - no point in heating the bolt themselves clearly.
RE: drill bits - I tried slow, fast, little pressure, lots of pressure, nothing seemed to make any difference to be honest, as it would just blunt the tips and then wouldn't actually drill anything. :\ I must've snapped most of them to be honest with the pressure, combined with the tip blunting and not doing anythign useful.
I'd considered taking the exhaust off to be honest, but then the way things had panned out so far, I could just imagine half the manifold studs shearing as well - the first 2 nuts came off without any issue, but the third felt very stuck and I bottled out! :lol
My plan of action is to (a) speak to a bike mechanic chap I've used a few times before and see if he can sort out the 'nearly drilled out' bolt as I know he's got a pillar drill in his workshop, and i trust him (b) get a second set of downpipes complete with valve so I can clean the whole downpipe section up so they look like new and service the valve in them, then swap the whole lot over.
RE: drill bits - I tried slow, fast, little pressure, lots of pressure, nothing seemed to make any difference to be honest, as it would just blunt the tips and then wouldn't actually drill anything. :\ I must've snapped most of them to be honest with the pressure, combined with the tip blunting and not doing anythign useful.
I'd considered taking the exhaust off to be honest, but then the way things had panned out so far, I could just imagine half the manifold studs shearing as well - the first 2 nuts came off without any issue, but the third felt very stuck and I bottled out! :lol
My plan of action is to (a) speak to a bike mechanic chap I've used a few times before and see if he can sort out the 'nearly drilled out' bolt as I know he's got a pillar drill in his workshop, and i trust him (b) get a second set of downpipes complete with valve so I can clean the whole downpipe section up so they look like new and service the valve in them, then swap the whole lot over.