OOPS
Although 2 stroke oil should keep the bores lubes, it isn't designed for heavy shear lubrication. the rattling is worrying, but coupled with a lot of smoke, and an inability to start, you may be in for a top end rebuild.
2 stroke motors run seperate gearbox oil, all the stuff has to do is keep the piston rings from sticking, and keep the bottom end roller bearings from running dry.
4 stroke oil has to cope with huge amounts of wear and tear in comparison.
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Harley Davidsons,
The most effective way of turning petrol into noise without the side-effect of horsepower
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