why is my suzuki boulevard c50 backfiring during acceleration?

John

New member
Runs fine but during acceleration it starts popping and backfiring, I cannot go over 45 miles per hour cause it gets bad. I checked the air filter and it idles and runs good someone told me to check the exhaust gasket because the guy I bought it from changed exhaust but is there anything else to look for?
by the way it is fuel injected.
how do you richen fuel injection
 
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