2000 yz426f oil weight?

Any one know what oil weight to run in a yz426f?

10w-40, or for the very hottest 2-3 months in CA, 20w-50. Be sure to use a premium quality oil, preferably a synthetic blended specifically for motorcycles that share engine oil with the transmission.

Use oils labeled JASO MA/MA2 wherever possible. DO NOT use oils labeled JASO MB, or API ECII (energy conserving 2)

Read: http://www.thumpertalk.com/topic/257280-maintenance-questions/#entry2132297

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