Re: 9.9 Johnson Carb Question

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outbdnut2

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#59725

Last week I ground a wrench thinner so I could loosen the throttle cam bolts. I’ve got it at the far end of the slot (throttle cam sticking out toward the roller all the way), and it is now about .010 inch from touching the roller when at the arrow. The throttle is closing completely at idle – I checked that the first time I took the carb apart. The idle seems to go bad with decreasing throttle just as the throttle plate goes completely shut. I will pull the welch plug and check the bearing on the low speed needle and see if I can further clean passages while the plug is out, there could still be some stuff in the idle gas passages. I cleaned a lot of junk out of the carb – so much dark brown stuff crystalized around the float needle, that it was seized up. Also will check compression – haven’t done that yet because after a lot of effort I have it running so darn good at fast idle and above.
Dave