40-series

My alternator has been questionable since I acquired this 40. Hate to replace oem with a crap aftermarket part. What's available that's recommended? Anyone replaced one recently?

My 2f motor will have a small amount of run on most times I drive it and turn it off. About one second after turning off the key. Sometimes it is very slight and other times it goes for a second or two and then there is a fairly big hiss type sound before it stops. Is there a common cause of...