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Gas?

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I'm borrowing a buddy's crf50 so I can rip up my neighborhood, and I have no idea which type of gas to put in it. I know I've gotta use 91 in my 450 thumper, but does the 50 need 87 octane? Suggestions? :thumbsup:

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If the motor is stock 87 is fine, if it has a big bore kit use 93 to be safe.

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I put 91 in it last time I filled it up... is that gunna hurt the engine? I ran through that tank and put 87 in and now it is a dog! I can bearly keep up with the cars I'm trying to race thu the neighborhood!

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Putting a higher octane wont hurt the motor, if its running bad with the 87 you may want to put some 93 in. Is it just slower or is there any kind of knocking, backfiring, etc?

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