Have a Briggs 280H07-0124-E1. Will turn over a couple times then lock up on what seems to be the compression stroke. Took out plug, bypassed selenoid, mower turns over perfect. Left plug out, went back to battery, turned over by switch -turned over fine. Previous searches suggested valve adjustment was in order. Adjusted exhaust to .010, adjust intake to.006. Replaced plug, tried to start==same result, bypassed switch and selenoid straight to starter-same problem. Wondering if I should go back to initial valve setting as if tore down and if so, what is that process to go to initial setting? or any other suggestions?? reddragon, kennyv--HELP