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Plus gas is easiest to get in uk (wilko soemtimes sell it), but have found "kroil" is very effective. Suspect its just acetone and atf (pb blaster) and it stinks, but so far have yet to find a bolt that it hasn't at least helped it come out.
But patience and prep is your friend, exhauand manifold bolts are often a pita. Scrape as much crusty bits in that might stop the bolt turning, wire brush or wheel it, oil it over a few days, heat it if needed, shock it, consider using an impact screwdriver or impact wrench, have found a quality impact wrench (got a super powerful facom impact which tbh paid for itself in its first few days of use) loosens bolts with much less chance of rounding or snapping
Decat-ing a bike, is it road legal after?
And should I tell my insurance?
Tempted to replace the exhaust in the TransAlp and the LeoVince pipe and can shave several kilos off the stock kit (10+ kg) and add a couple of HP.
Also, what's good for loosening seized/ rusted bolts on an exhaust?