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GWEddie wrote:

Coot, didn't you try to turn the engine by hand after you fitted the belts and before starting the engine? If you did and it turned without locking up, then it sounds like a belt slipped after you did start the engine. Half a tooth off is not unusual for a Wing, I just can't see how half a tooth off would do this.

Eddie is right, the timinghad to be several teeth off for this disaster. But Coot already knows this from one of his posts. Just turning the engine by hand before starting would have save all this and this is what every mechanic in the world does after fitting new belts because it's common sense.
I also think a used engine is a better option. Once I read about the bent rod and the damaged bore that was enough for me to suggest another engine. Much cheaper for a start. Also if a guy manages to wreck an engine by getting the belt timing worng, I'd have to question his ability to rebuild a damaged engine without making other errors, no offence intended but that's just the way I see it.

 

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I've done one. You will need a Haynes manual even if you are experienced in working on other motorbkes. Spending the money on your own engine is a better idea than fitting a used one. For a start you know the history of your own engine and also you will be fitting new parts to it.