oil in cooling water

[Jakobi]

Just read another thread about oil in coolant where GMP advises that its most likely the water pump seal. In this one he says head gasket ?

I agree to check what was touched last. Problem is that the shop pulled the side cover to replace kick starter shaft and when getting home I pulled the top end to do the head and piston. Could be one of either.

Could you elaborate on what you mean by boil over? Building up enough pressure to push the fluid out the overflow? or just bubbling into the expansion resevoir?