I hooked up my vacuum guage today on the Donzi (vacuum fitting in the manifold under the STB side of the carb) to check the mixture screws. I was able to improve the vacuum a little but the highest reading I get is 15". (Good for women but not for engines ). I checked the timing and the pointer lines right up with the mark on the balancer. Should be 10 degree BTDC per the manual.
I loosened the hold down bolt and rotated the distributer (electronic) to advance the spark and the rpm climbed and the motor sounded better. The vacuum went up to the green zone (19"). Is 15" OK (again for boats, we already discussed women)? Is there something I'm missing? Nothing has been changed this season.
I'm going out Thursday trying to get in as many days before it gets cold so any ideas will be appreciated.
John C