Just replaced both valves in a brigg 135292-1158-E1, lapped them in, adjusted intake to .006 and exhaust to .010. New head gasket properly torqued, carb and tank cleaned with new carb kit. Engine started right up but pops/backfires through exhaust. Could it be a bad valve or setting or anyone with any idea's? Thanks Bud
Briggs Pops
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