Honda CR500 Phathead Combustion chambers Chamber selection:HN52 - 62.5cc (100+ octane) 5mm (105cc) big bore chamber Chamber selection:Athena145 9cc (100+ octane) 52mm big bore chamber CR125R9304 YZ250
Description
Honda CR500 Phathead Combustion chambers Chamber selection:HN52 62.5cc (100+ octane) 5mm (105cc) big bore chamber Chamber selection:Athena145 9cc (100+ octane) 52mm big bore chamber CR125R9304 YZ250 5mm (105cc) big bore chamber 100+ octane for use with big bore piston This head kit uses the 2024 2025 style plug with longer reach for an upgrade to the 2009 2023 models
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