1967 Johnson 9-1/2 idling issue

[dfrants]

my 1967 Johnson 9-1/2 starts and runs great except when I turn it down as slow as it will go, she will idle very slow for 30 seconds or so than speed up on its own for 10-15 seconds then slow back down again. Fuel pump? carb float? any ideas?

 

[flyingscott]

Open the low idle screw an 1/8 of a turn.

 

[Crosbyman]

speeding up may be sign of fuel shortage even if temporary
when it speeds up pump the fuel bulb to see if the speed returns to idle... if it settles down it was short on fuel.... has suggested openning the idle needle a bit may help

bring up the idle speed a bit with the side knob

how long since the last carb clean up... these 9.5hp need CLEAN carbs see article

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[racerone]

Running out of fuel.-----Inspected for cracked coils ?----These motors often have 2 cracked coils or a set of new ones already.----Does spark jump a gap of 1/4" or more on both leads ?