1986 Honda trx350 running rich
I have a 1986 Honda trx350 that is running rich (oem carb). It pumps out black smoke till warmed up then if reved when warmed up it pumps black smoke out. It idles normally for a bit then shuts off after a bit and noticed that it pops when reving down. I’ve messed with the screw hanging below the carb but it hasn’t made a bit difference.
I have no experience rebuilding or tuning carbs only cleaning them. The previous owner told me that he had drilled out the carb at one time and I think put a bigger jet in but not really sure.
Is there are any good aftermarket carbs that I could buy? Or should I find a way to fix it?