Home › Forum › Ask A Member › 9.9 Johnson Carb Question › Re: 9.9 Johnson Carb Question
June 17, 2017 at 2:46 am
#59810
The later 93 and up intake has a passage between the intake runners just before the reeds. And only a half baffle at the carb. Look at intakes on ebay or images and you will see the difference. The op has a 77 and has electro ignition. The position and size of the holes under the welsh plug are another tuning tool.
The unequal intake runners with a single carb I suspect is causing resonances at low rpms with that motor. The changes to the intake in later years might be an attempt to clean up the lower rpm.
