The carbs are out of line or you have flooded one of them. Take the plugs out give the machine about a dozen pulls to clean out the engine and then try that again. If it doesn't work replace the plugs and set the carbs back to factory settings.
40mm
about 110
Are the battery and charging system in good shape?
140-150 depends on aftermarket parts, miles, use, so on.
120 P.S.I. is acceptable low, 130 is good 135 is factory startup/breakin period required.
Throttle plate sticking? Vacuum leak?
700
700
700
700
700
700