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This is an authentic OEM Honda valve rocker arm cover cap designed for classic small-displacement horizontal OHC engines. Made from heavy-duty die-cast aluminum alloy, this finned cap mounts on the cylinder head and helps support proper top-end protection by improving airflow and heat dissipation around the valve area. Its raised vertical cooling-fin design matches the factory style used on vintage Honda 90cc and 110cc engines. Key Specifications & Identification Material: Die-cast aluminum alloy OEM Part Number: 12331-028-000 Casting Markings: Often marked HM-K1 on the underside Compatible Models & Years Honda CM91 90cc: 1966 – 1969 Honda Trail 90 CT90: 1966 – 1979 Honda Super Cub 90 C90: Late 1960s – 1970s variants Honda ST90 Sport 90 / Trailsport: 1973 – 1975 Honda ATC90: 1970 – 1978 Honda ATC110: 1979 – 1985
Please verify compatibility with your specific motorcycle model before purchasing.
Cleaning Status
partially_cleaned
Cleaning Notes
Used surface cleaner
Worldwide shipping available
Express shipping available at checkout
Estimated delivery: 2-5 business days
All items are carefully packaged for safe transit
Items can be insured — contact us for more information
30-day return policy on most items
Items must be in original condition and packaging
Contact support for return authorization
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Yes, all parts with OEM numbers are genuine manufacturer parts. Check the specifications tab for the OEM number.
We offer a 30-day return policy. Items must be in original condition. See the Shipping tab for complete details.
Yes, we ship to most countries worldwide. Shipping costs and delivery times vary by location.
Parts are sold separately. We recommend professional installation for safety and warranty purposes.
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