I have a 115 Yamaha 4 stroke 07 I think won't start I have replaced all the fuel filters the fuel tank the line and primer bulb new plugs plug wires are firing spins but start don't even try even tried starting fluid nothing. Any ideas
all motors need good compression, good spark at the correct time, and the proper fuel to air ratio to burn properly.
all can be tested except fuel to air ratio.
test what you can before chasing the too rich or too lean fuel to air
