Johnson J40RCRM, 1984

by Joe Loupe
(Trinity, NC)

My 40 hp johnson started having a metallic tap after running a few minutes at the lake, when i got it home and started investigating i finally found one of the stater plate screws had come loose and was hitting the flywheel, this took care of the metallic tap issue, but now it idles fine but will bog and run rough on acceleration, i have installed new power pack, new sensor, new coil and new plugs and still bogs,

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Aug 31, 2021
slight loss of power
by: Terry Baughan

Sounds like the most obvious problem would be the carburetor needs cleaning that would be my first choice. Second is the fuel system, either fuel pump or vent on tank is closed.

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