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okay, compression is 130 to 145 on all of them, i think its the carborater tho, the two screws on the front of the carb witch are the fuel mixture screws i think i backed out 1 1/4 of a turn and idled it down and now it dont back firre at all but it dont sound as mean at idle anymore it idles smooth know, think theres trash in there causeing it to run lean at that setting?
if your backed them out you richened up the mix I thought it sounded like a lean pop the mean sound was probably a starving motor lol if it's smooth it's right
some might scoff at this, but i've done it with pretty good success.
run a full bottle of seafoam through a half tank of gas.
if it is just varnish, the seafoam should clean it out pretty well. if it is debris, you'll have to clean it the hard way, but seafoam is pretty good stuff, but it will fix a dirty fuel system problem about 7/10 of the time
i do it as a matter of maintence on all of my vehicles,