My ZN1300 is hard to start and is running rich across the board. Any ideas what to look at?
My 1985 Voyager suffered plug fouling and it seems to be a common complaint. I found that the fuel return check valve that screws into the bottom of the gas tank was stuck in the closed position. This valve allows the excess fuel from the injection system to return to the tank. If your tank has ever had any rust or sediment in it or sat with old gas in it you could have a stuck or partially restricted valve. The result is excess fuel pressure which has to go somewhere. That somewhere is through your injectors. You get more fuel than the computer is calling for, lousy gas mileage and fouled plugs. The valve also must not be stuck in the open position. If it is, then the fuel in the tank can drain back against the injectors when you shut down the bike and you end up with fuel in the air box especially if your injectors are dirty. So many problems from one little valve. Take the tank off and remove the valve (it screws in vertically into the bottom of the tank; left rear corner). Attach a
