I’ve got many years as a youth and young adult with a martin 40. Don’t know of a primer on one but there is a choke…ya need to find out if it is a lean or rich starter first. Make sure choke closes fully.
Mine ran so much better after I put on a diaphragm carb off a techumsah 2 stroke 5hp…way back in 1973 or so. Vertical throttle shaft made it easy.
