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Hi everyone, We already ran 25 hours on our yz450f 2018 here, and spent more time wrenching than riding. First, the design of the airbox is just a nightmare. In sand condition, you should have a Dyson in the van, remove the cage and change filter every 30 minutes. We changed for the twinair power flow kit, but it's not...

Any idea to boost the power of a CRF450R 17? PC seems to have the high comp piston already but our rider is asking for more low to mid power. thanks