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1984 Honda CB450SC Nighthawk Bowl Drain Screw Matching

The bowl-drain service choice for a 1984 Honda CB450SC Nighthawk is an individually supplied screw with its O-ring. Compare the removed component and the fitted carburetor before ordering. A matching motorcycle application does not replace checking the thread, tip, head and seal position at the bowl being serviced.

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Honda CB1100 CB1000 CB900 CB750 float bowl drain screw -a

Honda CB Stock Type Float Bowl Drain Screw ~-A

$6.50 USD
48-5042
Small part, but an important one. This float bowl drain screw with included O-ring allows you to properly drain the carburetor bowl without leaks,...
Honda CB1100 CB1000 CB900 CB750 float bowl drain screw

Honda CB Stock Type Float Bowl Drain Screw

$6.50 USD
48-5042
Replace your stock-type float bowl drain screw with this Float Bowl Drain Screw with O-Ring for the later DOHC and Nighthawk lineup.Note: sold each,...
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1984 Honda CB450SC Nighthawk · Bowl Drain Hardware Buying guide

Match the screw geometry and count the affected bowls

The selected listing includes one screw and one O-ring. It specifies two for complete renewal on listed twin-cylinder applications. Its detailed guidance calls for checking the carburetor identification together with screw thread, tip, head and O-ring position, then inspecting the sealing seat rather than relying on force.

Parts to consider

Honda CB Stock Type Float Bowl Drain Screw ~-A Individual bowl drain screw and sealOne screw with one O-ring; match its thread, tip, head and seal position to the removed component.View part

Resolve the carburetor match before counting spare hardware

The current listing explains that Honda used different carburetor families over the years. Compare the identified carburetor and removed screw instead of choosing solely from a broad motorcycle list. The second drain-screw listing is not presented as an additional required purchase or a proven interchange.

Examine the sealing area rather than compensating with extra force

The screw FAQ recommends replacing a hardened O-ring, cleaning the seat and checking for fuel leakage. It also warns that excessive tightening can damage the screw or crack the bowl. Use those inspection findings when deciding what needs renewal; no numeric tightening value is supplied.

Ordering questions

What quantity covers one damaged bowl drain compared with both listed twin drains?

One item supplies a screw and an O-ring for one bowl. The listing states that two are needed for complete renewal on the listed twin-cylinder models. Match the fitted drain components first, then count whether one or both positions need replacement.

Which removed-screw details help identify the right replacement on changed carburetors?

Compare the thread, tip, head and O-ring position, and confirm the carburetor identification. Those are the listing’s specified matching points because Honda used different carburetor families. The motorcycle’s year alone cannot identify a bowl fitted during earlier replacement work.

What should I examine before ordering another screw for a drain that still seeps?

Check whether the O-ring has hardened and whether the drain seat needs cleaning, as the listing advises. Excessive force can damage the screw or crack the bowl. Inspect that sealing area before assuming another screw or tighter seating will resolve the work.

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