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Jetting from 4000ft to Sea Level

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I bought an 06 yz450 with a FMF Factory 4.1c that was jetted for 4000ft. I rode it for the first time today around sea level (up to 1 or 200ft) and it ran great. I havn't checked which jets I have, but I know it was set up for 4000ft. Should I worry about running to lean, can I hurt the motor?

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