Although I haven't installed my yf it's my understanding that it is a much better carb and doesn't suffer from zinc creep or warped flange surfaces such as the Rochester B does. It does have a leather diaphragm which according to Carbking (who used to post here all the time) is prone to drying out if you run any fuel with ethanol in it--if you don't run it on a regular basis. This is supposed to be the king of carbs for that engine. Do a search on Carbking in the "Display Name Search" box using the search function (located between "Active Topics" and "FAQ")and you'll find out all you need to know. Good luck and Merry Christmas!
