As for cleaning carbs, for the last one I cleaned I purchased a gallon bucket of carb cleaner with a built in basket at the auto parts. I took the carb apart, put the parts in the basket and soaked it in the cleaner overnight. Then I took the parts out and followed up with compressed air and spray carburetor cleaner through all the tiny passages in the carburetor body. I finally, put it back together with new gaskets and a new float valve, adjusted the float valve and I was good to go. Not as hard as it sounds after you've done a few. BTW the carb was off a Mercruiser I/O 4 cylinder boat engine, the engine went from barely running at all to running perfectly and idling smoothly at 400rpm.
PS I noticed you talking about your owners manual. It must be an RV thing, the owners manual in my 1994 Holyday Rambler is the most worthless document that I believe has ever been written!
