You still can't see the point. Walbro carbs have been updated to eliminate the "problems" that were inherent with what I'm going to call "ancient" carb components. Meaning those used before the use of ethanol. So for a few years now they have been selling carb kits with several "same" parts in them for the user to select for the type of fuel used in their areas. Now if users are using old equipment that has not been upgraded for fuels that have been in use in many areas for decades that's not Walbro's fault. Nor is it the fault of the fuel since it's been in use for a long time.

Many factors can influence carb performance. Simply storing them for a long period of time can create performance issues. Failure to service them periodically lets issues arise from neglect. Just for giggles, the last time I was in Hawaii I saw a lot of what I would call "clunkers" in various states of neglect and disrepair still being used by the local population so I'm going to presume there are a lot of boat engines in similar condition. The carb parts are there for anyone that wants to buy them to upgrade to the current fuels in use. To complain about what's being used and jump through hoops to find gas without ethanol instead of buying a $10.00 carb kit doesn't make any sense at all. The ethanol in the fuel does not do anything to the engine itself.

BTW, I still have carbs that have rubber diaphragms and they work just fine, although the pump membrane has been changed to ethanol friendly materials. So what else is in your gas?

It won't be but a very short time before any gas used in the U.S., continental or otherwise, will have ethanol in it, so it might be a good idea to be prepared for that. The general population takes the backseat to the energy companies, environmentalists, and special interest fuel groups everytime.