I don't trust the float valve in these little carbs so I always try to remember to turn off the petcock even if I turn the motor off for just a few minutes.That's uncanny!!
I found the exact same thing on mine today. Mine was caused by serious flooding from leaving fuel on overnight and messing with the carb primer button too long. The entire crankcase on mine was flooded overnight and when I tried to start it, poof, splat, gas and oil out every orifice. I got it started finally and cleaned it up and let it cook off. It isnt leaking, but it isnt running right either.
I'm interested in what experts recommend for you, since it probably applies to me too.
I think you should replace the gasket. For your safety and it will lessen your costs.Today after a long ride I noticed a drop of oil dripping off my intake manifold onto a cylinder fin right under it. The flange bolts are tight and the motor runs well.
Should I replace the gasket anyway on these used engines?
Im on top of it. I made a new gasket, ported and resurfaced my intake manifold, and I also resurfaced the port deck. Replaced the intake studs, and used gasket sealer.I think you should replace the gasket. For your safety and it will lessen your costs.