(1) Spark time is less than 0. 8m s reasons: a. High voltage line resistance is too large; b. Spark plug gap is too large; c. Sub-disc and sub-fire head gap is too large; d. Mixed gas too thin; e. Spark plug temperature is too cold; f. Ignition timing is too slow; g. Cylinder pressure is too high; h. Valve spring is too weak.
(2) Sparking time is higher than 2. 4m s reasons: a. High voltage line resistance is too small; b. Mixing ratio too thick; c. Spark plug gap is too small; d. Cylinder pressure is too low; e. Spark plug temperature is too hot; f. Engine oil consumption; g. Ignition timing too early; h. The valve clearance is too small.
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