I don't know if this will be helpful, but I would check the compression and see if the rings are holding compression. If they are, that would indicate the cylinder should be drawing air in through the carb. If there is poor compression in the cylinder in question, that could mean that cylinder is not drawing in the air through the carb.
SOURCE: 1974 60hp johnson outboard won't run on full throttle.
Carbs probably need to be cleaned and re-built. Common problem in outboards that havent been run in a while
SOURCE: outboard motor idles but will not speed up
You really have to blow out the jets to clear any varnish left over from lay up.
SOURCE: need to know how to set up carb on 1985 johnson
try disconnecting the throttle cable, loosen carb linkages, assure that both carbs are FULL closed....tighten linkage - and cable ...check for FULL open and close with the throttle....this will be your starting point, advise to get a service manual for your outboard model to correctly adjust the carbs for max performance....GL hope this helps..
SOURCE: Boat engine 1995 Johnson Outboard 70 HP
Ihave a 1991 70 hp Johnson outboard thats hard to start the first time but starts good after that. Seems to be flooded. Starting rpm seems to be low.
SOURCE: outboard problem
Adjust the bottom Finn under propit has to be perfectly straight when motor is straight it's like a rear end ailinemen for your boat
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