1971 100hp evinrude starflite stalls under load

[mike11]

Hi everyone I'm new to this forum & hope for some advice. My 71 model 100hp motor runs fine out of the water but as soon as its in the water & I put it in gear it's like the key has been turned off it just shuts down. The fuel bulb stays firm but I found by placing slight pressure on the bulb & squeezing it i can put it in gear & it will run just above idle any suggestions would be appreciated thanks. Model no is 100193a

[boats.net]

Check compression, check that firing on all cylinders, may need to remove and clean carbs.

[mike11]

Ok thanks for the reply I'll pull the carbys of & give them a good clean & see if that helps