Either set of carbs will work and should work just fine. If you're having idle problems make sure the rings aren't starting to stick and it has the right Champion plugs. Obviously the carbs need to be clean, it needs fresh fuel and the motor needs to be basically healthy.
Some of these 3 cyl engines were produced with adjustable idle jets. Some were not. My preference is always to try to locate carbs with adjustable idle jets for these engines-as they are not know to be smooth-idling engines. The 84 carbs appear to have an idle screw in them. The early 89 carbs do not-they have fixed idle jets. I would not recommend these fixed idle jet carbs- if you have idle issues. The late 89 (433698) carbs have the idle screws in them-preferable. The factory manuals are pretty specific about setting the adjustable idle screws on these engines-a rather lengthy and detailed process.
Yep, picked up a set of 1984's and when i recieved them they are fixed idle jets. Didn't look at the diagram for them close enough. The adjustable idle jet 84's are for 75hp only. Wonder if a guy could swap the fixed jets for the adj. jets? Listed as the same carb. http://www.**********/parts/search/BRP/JOHNSON/1984/J70ELCRD/CARBURETOR/parts.html
Yep, picked up a set of 1984's and when i recieved them they are fixed idle jets. Didn't look at the diagram for them close enough. The adjustable idle jet 84's are for 75hp only. Wonder if a guy could swap the fixed jets for the adj. jets? Listed as the same carb. http://www.**********/parts/search/BRP/JOHNSON/1984/J70ELCRD/CARBURETOR/parts.html
