Small Engines (Lawn Mowers, etc.): 14.5h.p. engine, needle valve, twin cylinder

Question
14.5 briggs model no.287707. type1272-e1. Screw on breather assembly came out got oil in carburetor, turned engine off, would't restart, sprayed a little carb. cleaner in carb and started but now it backfires at carb. and fire came out of muffler. Can you tell me what happend and how to fix it. Thanks for any help.

Answer
Hi Tony
It sounds like to me that the valves need re-adjusting, assuming it is an OHV model. I'll Give you the specs you need. SINGLE Cylinder - Intake .007-.009, Exhaust .017-.019. TWIN Cylinder -
Intake .004-.006, Exhaust .007-.009. Also check the crankcase to make sure it is not overfilled. A bad needle valve in the carb can cause fuel to run into the crankcase and contaminate the oil. Hope this helps.