1986 85 hp. I have never had this motor run for more than 5 seconds. I have good spark at all 3 cylinders. I have fuel at all 3 carbs. Compression is between 115 and 120 on all 3 cylinders (new pistons and rings). Flywheel mark lines up with mark on intake when #1 is tdc. Rebuilt fuel pump. Fresh gas. New plugs. When I do get it to start it is usually for just a second or two and if I crank it again it will usually crank hard and then backfire. When I look at the plugs it looks like #1 and #2 have never ignited (clean) as a matter of fact #1 looks like it has condensation on it, but I don't have it hooked to muffs(going to change impeller if i get it running). Sometimes I can see gas spit out of the top carb about two feet. Can it be that far out of time by adjusting the timing on the trigger? Can it be something internally they did wrong when they rebuilt it? Could it be a bad trigger? Almost forgot I also checked the reeds and they are flat and look good. Any ideas will be greatly appreciated.