Those motors run very well and are very powerful at low RPM, due to the 70CU Inch displacement. They do not rev up very high, but you should see about 27MPH max speed.
Their fuel recirculation system consists of dumping any fuel buildup in the intake manifold, overboard. With a bad/mis-tuned carb this can be up to 1/3 of their total fuel.
They are made to run on a 24::1 gas oil mix. High speed and low speed jets must be set, after carb is cleaned. Setting high speed jets, in the boat, at full throttle is an experience.
They have 2 sets of points and a single condenser, magneto powered ignition system. It is very powerful, however, the single coil is subject to cracks in it's case and eventual failure. If the ign fails, check points, point wire and then coil.
They can be easily pull-started. The generator/voltage regulator do not age well.
