Probably a little rich, but I think you can't be sure without an exhaust gas analyzer.
My opinion the correct mixture setting just approximately can be achieved without
this stuff. I recommend a 4 channel vacuum gauge and a CO emission tester for the
mixture adjustments. The CO level must between 1,5 to 3,5 % (volume) at the tailpipe.
Without tools you can perform the following:
- Preliminary check: (engine stopped) all throttle valves must open and close simultaneously
without any delay when the accelerator control linkage is moved. Any play in the linkage
must be eleminated before proceeding.
The "throttle stop" screws needs to be the same position on both carbs.
Mixture setting screws must be the same position at all cylinders (when not sure:
turn the mixture screws clockwise until it stops, then turn 2.5 to 3 revolutions counterclockwise)
- Start the engine, and run to normal operating temperature.
- The idle speed at hot engine must be 850 to 1000 RPM, if not adjust the "throttle stop" screws on
- Now turn all the mixture setting screws until the highest idle RPM achieved. (It may take a while)
(important: all mixture screws to the same position)
- Set the idle speed again (if necessary) with the "throttle stop" screws on both carbs.
- The idle must be smooth.
- You're ready, time to road test.
This method usually results a slightly richer mixture, than optimal. It will do, until you can
check the emissions with an analyzer.