Reply To: 1966 Johnson MQ-12a service manual

[Don]

There is a fixed high speed jet that is probably partially plugged.  Was the carb dirty/gummed up when you cleaned it?  Did you inspect/clean the high speed jet?  Don’t attempt to remove it unless you have the proper tool.  Trying to use a regular screwdriver will probably mess up the jet and damage the threads.

Is the oring and washer in place on the low speed needle, are the oriented properly?  The initial low speed needle setting is about 1.5 turns out from gently seated.