So every season I have to fight with a whole lot of starting fluid to get my bike running. After I finally get it running it runs fine until I put it away for the winter. So I need help. I have replaced the starter, blown out all of the fuel lines from the tank to the carbs, replaced the fuel pump, and rebuilt the carbs with new jets and O-rings. When I put the carb bowls back together I made sure that the O-rings went on correctly and didn't twist; so they're sealed properly. Fuel is getting to the carbs, I know this because when I try to get it going, the carbs will leak fuel out of an unknown location, however when I open the bowls drainage screws, nothing comes out. So fuel is getting to the carbs, but not through the carbs to get the bike going. After so many years of this I'm about to call it quits, so does anyone have any advice as to what the problem is, or how I can find out what the problem is?
Any help is greatly appreciated.
Thanks!

 

Im not a professional but Ive done a few carb teardowns so here goes... It sounds like your floats are gummed up and stuck open which is causing your carbs to overflow. The valves themselves should move up and down easily, the rubber end of the valve should be smooth without any indentation so that it seats properly, and the tip should be freely springy.
Secondly, i think your bike may be hard to start due to blocked choke jets. They arent removable, have an extremely small opening and get clogged easily (and are easy to miss!).
Lastly, to prevent all this drama, when I winterise the bike I add stabiliser and fill the tank with the highest octane fuel available (so there is less ethanol) and then run the bike to get stabilised fuel into the carbs. If I feel like it, I'll run the bike for 10-15mins once a month, enough to get the temps up and I havent had fuel related issues so far.