1980 7.5 Johnson - model number J8RCSS
The carb was serviced last year by mechanic. Unknown what parts replaced or problems encountered. Originally the engine would only run for short time with choke on. After service idle and low speed performance improved, but top speed performance very poor. Boggs down and will not reach top seed. Pumping fuel ball doesn't improve performance telling me this isn't a fuel pump issue. Correct?
Followed up carb service with new fuel tank lines. New fuel. Fuel filter screen on pump clean. Have not replaced plugs. Has champion L86C installed instead of preferred L77J4 as noted on tag on spark plug cable.
I recently pulled the carb myself. Found the damage evident in attached photo on the high speed jet/port. It looks like someone marred it up with a screwdriver. The large tube is damaged and partly gone at about 1/6" depth much of the way around the circumference of the tube. I don't see that this part is replaceable. Can a shop fix this or can someone help point to replacement carb assembly? And is this likely the culprit? I did once notice improved performance right off the boat ramp for 200 yards, then poor again. Maybe the bowl had more fuel than normal? Or could this be a spark plug, thermostat, fuel pump, compression, water pump issue?
The carb was serviced last year by mechanic. Unknown what parts replaced or problems encountered. Originally the engine would only run for short time with choke on. After service idle and low speed performance improved, but top speed performance very poor. Boggs down and will not reach top seed. Pumping fuel ball doesn't improve performance telling me this isn't a fuel pump issue. Correct?
Followed up carb service with new fuel tank lines. New fuel. Fuel filter screen on pump clean. Have not replaced plugs. Has champion L86C installed instead of preferred L77J4 as noted on tag on spark plug cable.
I recently pulled the carb myself. Found the damage evident in attached photo on the high speed jet/port. It looks like someone marred it up with a screwdriver. The large tube is damaged and partly gone at about 1/6" depth much of the way around the circumference of the tube. I don't see that this part is replaceable. Can a shop fix this or can someone help point to replacement carb assembly? And is this likely the culprit? I did once notice improved performance right off the boat ramp for 200 yards, then poor again. Maybe the bowl had more fuel than normal? Or could this be a spark plug, thermostat, fuel pump, compression, water pump issue?