Yes, heat is your friend here. That and a very large hammer. Remember, the object is to break the corrosion joint. Heating and cooling at the point where the bolt is stuck will help a lot. The best advice I have is get a Thor rawhide and copper hammer. Google your nearest supplier. If you intend keeping on with mechanicing, it'll be one of the best tools you will own. Then made sure you hit both ends of the bolt. You are trying to break the union.
A steel hammer can mushroom the bolt to the point where it won't fit back through the holes. That's where a copper hammer is great.
I've just give through exactly this problem with the rear axle on a 1983 TS125.
Cheers
Nigel in NZ
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