“The Black Hole” Oil Drain Plug | Honda CB360 / CL360 / CJ360

Description

The Black Hole Oil Drain Plug | Honda CB360 / CL360 / CJ360

The stock oil drain plug on the CB360, CL360, and CJ360 is soft, and after decades of seized removals it rounds off and chews up — until one day it won’t come out at all. “The Black Hole” is Common Motor’s billet replacement: a drain plug built to outlast the bike.

Why You Need This

If your drain plug head is rounded, burred, or fights you at every oil change, you’re one stuck plug away from a much bigger job. The Black Hole was the first part Common Motor ever designed from scratch, built specifically to fix everything wrong with the original. It’s machined from 4130 Cro-Moly steel billet, case-hardened with a QPQ finish for corrosion resistance, and carries a built-in magnet that pulls metal particles out of your oil before they circulate. It seals with an O-ring instead of the original crush washer, so there’s no soft aluminium washer to flatten and weep.

Features

• Machined from 4130 Cro-Moly steel billet — far stronger than the soft factory plug
• QPQ (quench-polish-quench) case-hardened finish for corrosion resistance — not anodized or black oxide
• Built-in magnet that collects metal particles from the oil
• Larger 22mm hex head for a solid wrench grip that won’t round off
• O-ring seal (included) replaces the original aluminium crush washer
• Made in Houston, Texas, USA — backed by a lifetime warranty

Specifications

Installation

Difficulty: Beginner

Tools needed: 22mm socket or wrench (a breaker bar helps free a stuck original plug)

1. Run the engine for a few minutes so the oil drains warm, then position a drain pan underneath.
2. Break the old plug loose — a breaker bar helps if it’s seized — remove it, and let the oil drain completely.
3. Check that the new plug’s O-ring sits level in its groove; a little grease helps hold it in place.
4. Thread the Black Hole in by hand, then snug it with a 22mm wrench. Do not over-tighten — an overtightened plug makes your next oil change a nightmare.
5. Refill with fresh oil. The CB360 holds 1.5 L / 1.6 US qt.

Oil: The factory oil grade is SAE 10W-40. We run a 15W-40 100% mineral oil with about two ounces of zinc additive per quart at every change, and recommend a fresh oil change every 1,500 miles. The CB360 uses a centrifugal oil filter rather than a paper element — clean it every other oil change, about every 3,000 miles.