hi guys i have bought 6, 2X 2004, 2X 2005 sea doo gti rfi all in non running con i have mannaged to get on goin and on the water.

i have gotten all the others to the same point all got spark all got compression all getting fuel all cherping all swinging however they will not fire and they are backfiring like champs.

i asume that the electrical is good as there is spark i asume the timing is good due to the flywheels have never been changed i have the manuals and i have set all the rotary valves the best i can to spec of the manuals.

i have noooo idea what else could be wrong any help is greatly needed

thank you