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Agreed with the above.---Post your compression numbers.-----What " work " has been done to the motor ?----Did the stalling issue present itself suddenly ?----Has water pump been serviced ?-----Mixing good oil at 50:1 on this motor.
How did this boat run for the son in law last season ?----Or is this a new toy ??-----Pushing the key in OPENS the electric primer valve.-----This valve then squirts fuel directly into the airstream while cranking.-----This wonderful item replaces " choke flappers " of years gone by.----The...
Are you giving it some throttle for cold starting ?---Are you pushing the key in WHILE cranking it over ?-----Lots of sparkplugs ??----Sounds like someone is guessing at what might be wrong.----Post your compression values.----And does spark jump a gap of 7/16" on a proper test device.
This foam under the floor is a great idea for the builder of the boat.------Not a good idea for the owner of a 40 year old boat.-----I am doing a boat and the foam has been tossed.------Installed structural bits instead of the foam.------No foam going into the boat once done.
If starter won't crank it over then charge battery.----Load test battery.----Inspect cables.----Inspect starter motor armature and brushes.----If all that checks out there are issues with bearings on motor I say.
If it was run without oil you may need a new crankshaft assembly at $1200 , 3 new pistons and machine work.-----If you have to pay a shop you are better off to to find another motor.
I am rebuilding a 1959 model 5.5 HP.----There is no runner lipped seal on the top of crankshaft.-----It has a slinger.------Upper bushing might be worn on your motor.