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O-ring lube is provided to help with assembly and reliability
part numbers from HotRods are 4166(2006-2021) and 4116 (1991-2005)
Improved flow
CRF450R 02-16
Honda CR500 Phathead Combustion chambers YZ250 O-ring lube is provided toChamber selection: HN50 66. 4 Stock compressionHN51 64. 4cc (95+ octane)HN52 62. 5cc (100+ octane)HN53 60. 8cc (110+ octane)