Since this is your first post here, take a look at the link below and check your ConversationsAfter checking all of the above, remove the cross over hose and check that fuel flows from BOTH sides, my tank had a blockage on one side for some reason. had to use some flexible wire to push through the pipe to clear it. The rest of the tank was like new!
Should have read replies before postingI have a ‘69 CB350 and ‘65 Bomber and have run into the same problem on many old Honda’s. Do the following: If you’ve never removed your petcock to check it, the reserve inlet pipe inside the tank can deteriorate and snap off or develop rust holes and leak sediment and build up in the reserve channel inside the petcock blocking fuel from getting to the carbs when the gas drops below the main petcock level in the tank. This effectively eliminates your use of the reserve level of gas, that’s why your bike starts running bad after your over a 1.5 gallons into your ride - your running out of gas! This is easy to
Check, just disconnect your fuel lines and see if gas is flowing in the “on” position, and then the reserve position. If your reserve has no gas coming out of it, it is clogged and you need to remove the petcock and clean it with carb cleaner and blow air through it until it flows freely like the main position.