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High performance valve springs designed for use with our high performance camshaft for the CRF150/230F. These valve springs are required when using the BBR High Performance camshaft for the CRF150/230F.Note: These valve springs only fits the 2003-2005 CRF150F or the 2003-2017 CRF230F. The 2006-2017 CRF150F is a completely different motor and will not accept these springs.