My 1981 gpz 1100 dies randomly while riding and will take awhile before it turns on. I had the fuel pump replaced. I can hear the fuel pump working. But it seems like it has no spark. When idling it idles like normal. The mechanic said it needed a fuel pump and 300 bucks later its still doing the same thing. It will start up fine and it will idle normal but just randomly on a ride it will just turn off. It just boggs and will just kick over normal and wont start.sometimes in the morning it wont star and later on it will star like normal. Any ideas will be greatly appreciated. I don’t want to get rid of it since I have owned it since 1983.