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rich/lean

RCManWithAPlan

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I have a redcat rampage xt with a 32 cc engine. Break in is complete. Lately it's been running rich. There is hardly no smoke though. But it sounds rich to me like it's choking up on fuel . The spark plug fouled out and i had to replace it. I'm using a premix fuel+oil 25:1 ratio that is high octane rating could this high octane rating cause a rich mixture that requires a hotter spark plug? I'm using the stock cmr6 should i switch to a cmr5
 

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