Home › Forum › Ask A Member › 1969 Evinrude / 1971 Johnson 9.5 Runs Poor › Reply To: 1969 Evinrude / 1971 Johnson 9.5 Runs Poor
OK, the issue I found many years ago concerned your first picture and the way those links are arranged/assembled. The one I was messing with was in the wrong order, so the sync was off. Wish I could remember the specifics better, but it was a few years ago. All I can say is to make sure the carb is closing all the way, look down the carb throat at the throttle butterfly, it should be completely closed when the cam isn’t touching that crazy pin/roller arm set up. If not, the engine will surely sneez/pop at low speeds like your does.
I have never seen an issue like you reported with that impeller. Are you using an OEM impeller or aftermarket.
And yeah, the 70PSI isn’t that bad for this low compression engine, try again after the engine has been running for awhile. Perhaps try a different compression gage.