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That is the way tuners did it before the advent of O2 sensors and dynos ........It is harder to read the plugs than you might think
......Here is another trick,,,,,, if you have access to the air inlet of the carbs you can slide a blocking plate accross the Inlet slowly at the desired rpm range and feel for the engine to change as it goes rich....This is hard to do at speed and isn't all that safe to be reaching down and taking your attention off the roadway......This is more of a track only method.....
What I do is the stopwatch method.... I find a fairly level "test & Tune" section of road far away from traffic and intersections. Then I stick the bike in one gear (higher the better) and I sweep the rpm from 4 K to 6K while WFO and click the watch on at 4.5K and off at 5.5K...... Any change becomes quite clear .
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If we arn\'t having fun,,,then we arn\'t doing it right.....
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