Yammy Cleaner instructions right off the bottle...
1. Drain stale fuel from float bowls and fuel lines and re-tighten drain screws.
2. Mix one part Yamaha Carburetor Cleaner to three parts gasoline.
3. Pour approximately 45cc of this mixture, per carburetor, into the fuel line. DO NOT PUT IN FUEL TANK.
4. Agitation of this mixture will improve cleaning. To circulate mixture throughout the carburetors, rock the machine from side to side and briefly push the starter button to draw mixture into jets and passages. Repeat as needed.
5. After one hour, drain mixture from carburetors, reinstall fuel line and allow fresh gasoline into float bowls. If the engine won't start, or runs improperly, drain the gasoline from the float bowls. Install fresh carburetor mixture, circulate throughout the carburetors and allow the mixture to stand overnight.
And the caps on step 3 were actually included in the instructions.