hardwatergrampa
Well-known member
you seem to know a lot about the johnsons so maybe you can help i got this motor about 5 years ago have run it every year but last took it out this year and it would run and stall well i took the pump apart and it had what looked like a pin hole in the dyeaphram could not find any info on the motor as to what year it is i went to nappa and we matched up a rebuild kit bench tested the pump seems to be put togather right put it on the motor same thing runs a few min then the the inline pump buld goes limp motor stalls so i would think its not picking up fuel took the carb off and rebuilt it changed the hose cuplins it got so it runs about ten mins now ckeck the tank vent as well any ideas and what year do you think this 4 hp motor is i was thinking late 70 early 80 the guy i got it from cant remember thanks for any help