Broken tooth? Was it used for stunting? a lot of F4Is are. I would replace it as soon as possible. On bikes it`s a safety issue. The white grease isn`t lithium, it`s wax. I don`t like it personally, it doesn`t lube very well. But some people do since it has less fling. I`ve heard about Dupont and it`s another good choice. Also make sure that your chain has the right slack, it shouldn`t be too loose or too tight. You service manual should tell you the recommended range.
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