Good parts source for those kinds of parts is http://www.marineengine.com. If they don’t go back far enough on the year, just look up the oldest year 3 HP they list. They will show both OEM and after market parts if available. I’ve found that a carb kit is seldom needed for these motors. Usually a good cleanout is all they need and the gaskets, etc will usually reseal fine. Sometimes you need a carb float that doesn’t come in most kits. Ethanol in the gas eats the sealer coating on the cork material.
Be sure to have the donut fiber washer in place that goes over the bottom of the main jet where it hangs down to mate with passage at the bottom center of the carb bowl. Easy to lose this when you take it apart. On those 3 HP motors, I have substituted two small O-rings from a Harbor Freight tool company assortment, stacked on top of each other for that donut, and that worked fine
Dave
