Discussion Starter · #1 ·
Hello I just re-powered my john deere 318 with a briggs 23 hp and after some work I managed to make run. After about 5 hours of use I changed the oil for the break in than it started to run rough. At low rpms it only seems to run on one cylinder until under load when it picks up the other one. At high rpms It runs on both but runs rough until load is applied. I Set the valves to .005 because they were about 8. It only runs on the right side at idle. And after I shut it off the left side is cold. I swapped the plugs and tested compression, tested spark, and timing all good. It does not have any vacuum leaks as far as I know? I'm lost. What could it be??