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Here's a guess.

You have filled your exhaust with fuel while attempting to start the bike.

Now the bike has produced just enough spark to get combustion on one side and has ignited the fuel in the exhaust.
 

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Super Moderator
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I had a bike do that about a month ago.

The issue, as in this case, is often a weak or erratic spark. Big bang in one sides exhaust. No harm done.

Coils from a GL 700 were fitted and now the bike {CB450} is an instant starter. :)
 
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