Tractor, Briggs 24Hp engine, backfires
I have a Briggs & Stratton 24 hp engine model 446677 0463 E1 on a Husqvarna YTH2448 riding tractor. The engine backfires (pretty much at all speeds except when blades are engaged), uses fair amount of oil, and produces blue exhaust smoke. Operating time 130 hours.
Question: How to fix the engine? Must I replace the engine?