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Athena big bore 490 jetting

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Old 10-07-2008, 10:17 PM
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Join Date: 09-21-2008
Location: Sacramento
Bike(s): 01 929 with 954 swap
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Athena big bore 490 jetting

Just installed an athena 490 big bore kit on my crf450r. Just wanted to see if anyone had any suggestions for jetting. I heard you would want to jet down leaner to around a 155 main jet, when 170 is stock. I would think you would want to go with a bigger main, but i guess with the big bore it draws in more volume which needs a smaller main or some mumbo jumbo like that? idk... Any input would be appreciated. Thanks!

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Old 10-08-2008, 1:17 PM
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Join Date: 09-21-2008
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Re: Athena big bore 490 jetting

No one, Really?
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