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1984 Honda CB650SC Nighthawk Valve-Cover & Engine Gaskets

A valve-cover leak and a full engine strip call for different gasket orders on the 1984 CB650SC. Compare the individual gasket with the Athena overhaul package, then match the actual joints being opened. Avoid duplicating parts before the set contents are confirmed.

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Honda CB650SC CB550SC Athena overhaul gasket set

1983-85 Honda CB650SC / CB550SC Athena Overhaul Gasket Set

$229.95 USD
18-0108
1983 Honda CB550SC Nighthawk Motorcycle Parts 1983 Honda CB650SC Nighthawk Motorcycle Parts 1984 Honda CB650SC Nighthawk Motorcycle Parts 1985 Honda CB650SC Nighthawk Motorcycle Parts Honda CB Engine Gaskets, Oil Seals & Hardware Honda CB Engine Parts Honda CB550 Motorcycle Parts by Model & Year Honda CB550SC Nighthawk Motorcycle Parts (1983–1984) Honda CB650 Motorcycle Parts by Model & Year Honda CB650SC Nighthawk Motorcycle Parts (1982–1985) Series 5: CB650 (79-82) Series 6: CB500-CB550 (71-78)
Rebuild your CB550SC or CB650SC Nighthawk engine with this Athena Overhaul Engine Gasket Set. Athena of Italy is an original-equipment supplier to Yamaha, Honda,...
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Honda CB650SC CB550SC valve cover gasket 12391-ME5-306

1983-85 Honda CB650SC / CB550SC Valve Cover Gasket ~ Replaces 12391-ME5-306

$39.95 USD
12-1023
1983 Honda CB550SC Nighthawk Motorcycle Parts 1983 Honda CB650SC Nighthawk Motorcycle Parts 1984 Honda CB650SC Nighthawk Motorcycle Parts 1985 Honda CB650SC Nighthawk Motorcycle Parts Honda CB Engine Gaskets, Oil Seals & Hardware Honda CB Engine Parts Honda CB550 Motorcycle Parts by Model & Year Honda CB550SC Nighthawk Motorcycle Parts (1983–1984) Honda CB650 Motorcycle Parts by Model & Year Honda CB650SC Nighthawk Motorcycle Parts (1982–1985) Series 5: CB650 (79-82) Series 6: CB500-CB550 (71-78)
Replace your Nighthawk valve cover gasket with this Fibre-Type Valve Cover Gasket, replacing OEM #12391-ME5-306 / #12391-ME5-000. Fits the CB650SC (1983-85) and CB550SC (1983)...
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1984 Honda CB650SC Nighthawk · Valve-Cover & Engine Gaskets Buying guide

Match gasket coverage to the amount of disassembly

The featured individual gasket serves the valve cover. The overhaul set is listed for the later CB650SC, but its full contents need checking when a particular oil seal or small sealing part is essential.

Parts to consider

1983-85 Honda CB650SC / CB550SC Athena Overhaul Gasket Set Athena engine gasket setOverhaul engine gasket set listed for the 1983–85 CB650SC Nighthawk.View part 1983-85 Honda CB650SC / CB550SC Valve Cover Gasket ~ Replaces 12391-ME5-306 Valve-cover gasketReplacement gasket using references 12391-ME5-306 and 12391-ME5-000.View part

Use the cover-specific identification

The valve-cover gasket replaces 12391-ME5-306 or 12391-ME5-000. Check the cover and engine application rather than assuming an earlier CB650 gasket shares the same outline. A model name alone is not a useful substitute for that component check.

Ask the set to cover defined joints

For an engine overhaul, make a list of the joints and seals needed before selecting the Athena set. The current product description does not enumerate its contents. Confirm any critical item rather than assuming every separately sold gasket or seal comes in the box.

Valve-Cover & Engine Gaskets questions

Does the valve-cover gasket include bolt seals or grommets?

No. It contains the main valve-cover gasket only. Inspect separate sealing washers, grommets and rubber plugs during disassembly, and select those parts separately if they are worn or hardened.

Should I order individual gaskets alongside the overhaul set?

Only after comparing confirmed set contents with the repair plan. That avoids unnecessary duplicates and makes any genuinely missing joint or seal clear before the engine work begins.

What should I check to prevent another valve-cover leak?

Check the cover for damage and remove old gasket residue without gouging the aluminum mating surfaces. Use the service-manual tightening sequence and torque; overtightening can distort the cover or damage the new gasket.

Not sure which part you need?

Send your model and year, plus photos of your existing part and any changes to the original setup.

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