Your bike is running lean. This means that there is not enough fuel mixed with the air in the combustion chamber. This can cause the engine to run hot, which can damage the pistons and valves. It can also cause the exhaust to pop or bang on deceleration, as the unburned fuel in the exhaust ignites.
There are a few things that can cause your bike to run lean, such as:
* A dirty or clogged air filter
* A vacuum leak
* A faulty fuel injector
* A faulty oxygen sensor
You should check all of these things and make sure that they are in good working order. If you are not sure how to do this, you should take your bike to a qualified mechanic.
Once you have fixed the problem, the popping on deceleration should go away.
