Chinese BBD Knockoff...?

I was playing with it today, the Chinese carb is unresponsive to idle adjustments I recommended he rebuild his Carter but I think the guy is going to buy another$ 80 Chinese knock off BBD. The oil level is dead on, oil clean no gas smell...The guy doesn't want to do the rebuild for some reason....He did say he had a fire, backfired through the carb and something may have messed up inside the carb.I do know he blew the muffler up...does Woodruff carburetor rebuid BBD's...?
I’m sure Dana will rebuild any carb. Kim