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The first photo is a sg400 map I don't know maybe it's a two-cylinder?
The map of the ignition advance angle is made under the exhaust standards, so it looks like the setting of the ignition advance angle, so that the engine has a lot of power and at the same time cooling it with fuel causes underfiring of the mixture and higher emissions you could get around this by using a real catalytic converter, but it is an additional production cost the option of depleting the mixture and shifting the ignition angle is a cheaper alternative.
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