Yep, I'm curious to know your definition of 'backfire' and a 'misfire'.
I`m sure you will allow for differences in transatlantic terminology.
is an event that occurs within the combustion chamber of an internal combustion engine when the fuel/air mixture fails to be ignited by the spark plug (in the case of the Burgman we know that this is due to a lose plug cap). A `Misfire` produces no sound.
Do not confuse with `Detonation` of the fuel / air mixture which is also an unwanted synario that does produce a sound. (I would be more than willing to define detonation, its causes and effects, should you wish me to).
is an event that occurs within the exhaust system of an internal combustion engine when the accumulated unburnt fuel / air mixture that has passed into it resulting from the `Misfire` is ignited as the ignition function is restored to the spark plug. The time interval involved is small but sufficient to allow enough fuel/air mix to create a small explosion, which in a modern well silenced exhaust system can be barely audible. The `Backfire` may occur as a single sound or repeated small popping noises.
It is the same principle that applies to engines fitted with carbs or injectors.
I hope this will satisfy your curiosity.
Lets not forget the original reason for the start of this topic.
The subject has come up before and the answer is the same, `ensure your plug caps are fitted properly`