Think gods trying to tell me not to own a cossie thats what

basically had bent 2 valves just b4 xmas, got the head back fri with 2 new valves in and put it all back together sat but doesnt want to turn over now so trying to work out what the fucks up with it!!! I'm guessing electrical as its tring to turn over but wont actually start up properly and seems to be getting fuel ok...............