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What causes a reddish color on a spark plug from a Yamaha Zuma?
Wiki User
∙ 14y ago
A red discoloration of a spark plug usually indicates that an octane booster or other fuel additive has been used. The discoloration shouldn't affect performance, but the additives might. Another note: Octane booster is not recommended for motorcycles because it contains conductive materials that can affect the ignition system.
Wiki User
∙ 14y ago
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