Home › Forum › Ask A Member › 9.9 Johnson Carb Question › Re: 9.9 Johnson Carb Question
June 4, 2017 at 2:46 pm
#58957
quote pugetsoundboater:
I thought the low speed mixture comes through the 3 very small holes in the throat of the 9.9/15carb,just above the low speed needle “mixing pocket” as fleetwin described it recently in the thread i started about the needle bearing.
I use orifice drills to check all the passages are clear, but i use the smooth end of the bit and a slightly smaller size so as not to gouge any passages. In your situation i would recommend the same and definately remove the welch plugs and clean those passages out.
I use orifice drills to check all the passages are clear, but i use the smooth end of the bit and a slightly smaller size so as not to gouge any passages. In your situation i would recommend the same and definately remove the welch plugs and clean those passages out.
Yes the gas comes through those small holes in the throat as it’s sucked into the motor, but how does it get from the the bowl up to the low speed needle? Older OMC carbs route the fuel from the bottom of the bowl through a passage up the side of the cast bowl, through a hole in the bowl gasket to the top of the carb where it goes to the needle.