hey to anyone who can help. i have managed to get plastic from my bike cover on the exhaust (I thought i left it long enough to cool.) and now it is stuck on fast. the more annoying thing is i only put the new exhaust on last week. so the question is what is the best way to remove it. thank you all
Plastic on exhaust
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It's HIGHLY flammable.
Melt it again
I'd run the bike until the exhaust gets hot and the plastic becomes squishy again. Then try and scrape it off with something that won't melt and won't mark your exhaust (it sounds odd but a wooden stick would work). That or use a kitchen blow torch if you've got one. Then use a metal polish to get rid of any discolouration and remaining crud (I use Autosol to remove road tar from my bike's exhaust, takes some time but works a treat)
I'm with eatscs01:
Acetone will remove it, but ONLY do it when the exhaust is totally cold. Use it sparingly too.
Sounds like you're more concerned about the exhaust than the cover - in which case, just run the engine for a few minutes, gently peel off the cover, and then forget about it for a bit. Most of the remaining plastic will burn off. The burnt bits left after a good day out will probably just pitch off really easily once the exhaust has cooled again - it's not going to damage the metal.
You could try a freeze spray to make the plastic brittle and the metal contract (plastics generally have a lower coefficient of thermal expansion than metals) but be careful, metals become brittle when they're cold too. That's why you can freeze and smash a brass lock.