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1971 Honda CL450K4 Drain Plug & Rotor Washer

The oil-service choices here for a 1971 Honda CL450K4 are a custom magnetic drain plug and an angled rotor washer. Start at the part being replaced: one needs thread and clearance checks, while the other needs rotor-specific identification.

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Honda CB500 CB450 joker machine magnetic oil drain plug 90013-312-000

Honda CB Joker Machine Magnetic Oil Drain Plug ~ Replaces 90013-312-000

$64.95 USD
12-0108
Catch engine debris between oil changes with this Joker Machine Magnetic Oil Drain Plug with O-ring, replacing OEM #90013-312-000. High-quality 6061 billet aluminum body...
Honda CB500 CB450 CB360 special oil filter rotor washer 90481-292-000

Honda CB Special Oil Filter Rotor Washer ~ Replaces 90481-292-000

$9.46 USD
29-7034
Replace your oil filter rotor washer with this Special Angled Oil Filter Rotor Washer (16mm), replacing OEM #90481-292-000.Key Features• Special angled oil filter rotor...
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1971 Honda CL450K4 · Drain Plug & Rotor Washer Buying guide

Check the plug opening and rotor hardware separately

The Joker Machine plug brings an O-ring and documented external dimensions. The rotor washer is a shaped, 16 mm component with its own reference; choose it by assembly rather than size alone.

Parts to consider

Honda CB Joker Machine Magnetic Oil Drain Plug ~ Replaces 90013-312-000 Magnetic drain plug with O-ringJoker Machine plug with an O-ring, M33.7 × 1.5 mm thread and 19 mm socket fitting.View part Honda CB Special Oil Filter Rotor Washer ~ Replaces 90481-292-000 Angled oil-filter rotor washer16 mm angled rotor washer; compare reference 90481-292-000 with the existing part.View part

Check more than the thread

The magnetic plug uses a 19 mm socket and has a 45 mm outer diameter. Check access for that socket and the stated 19 mm case projection, especially where surrounding parts have changed. These are replacement-product dimensions, not proof of the engine’s original fittings.

Keep the washer’s identity intact

The washer is described as a special angled rotor washer, 16 mm, replacing 90481-292-000. Confirm it against the existing assembly and use its service instructions for orientation and tightening. The product description does not supply those installation specifications.

Buying questions

Does the magnetic plug come with its sealing O-ring?

Yes, the product is supplied with an O-ring. Compare the plug’s thread and surrounding clearance as well; included sealing hardware does not remove the need to identify the actual case opening.

Does magnetic capture replace normal oil-system servicing?

The magnet is described as capturing steel debris. That product feature is not a substitute for the engine’s specified maintenance or investigation of abnormal debris; follow the applicable service documentation.

Can the washer’s 16 mm size be used as an installation specification?

The 16 mm figure identifies the offered washer size. It does not provide an orientation, torque value or complete dimensional drawing. Use the rotor reference and the correct service instructions for those decisions.

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