You say the bike sounded ok at higher revs?
There's an old saying among tuners; It runs best just before it blows up.
A friend's CB350 twin engine died this last summer. When we took it apart we found the barrels out of round between .006" and .010" and one of the pistons was melted. The plug on the melted side was ash white (with molten aluminum lumps). We found air leaks which presumably caused lean condition, overheat, engine death.
Unfortunately, this friend is not particularly mechanically savvy so she had no clue of a problem until she lost power on the freeway.
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