Chrome Twist-On Gas Cap | Honda 175 / 350 / 450

Description

Chrome Twist-On Gas Cap | Honda CB175 / CB350 / CB450 Twins

Honda’s early twins use a twist-on gas cap that screws straight onto the filler neck — no hinge, no tether. That makes it the kind of part that gets set down on the workbench and lost, or left to pit and dull after decades of weather. This is a chromed, OEM-style replacement that threads right back onto the stock neck.

Why You Need This

Because the screw-on cap isn’t connected to the bike, it’s easy to drop, misplace, or damage — and a missing or dented cap leaves your tank open to dirt and moisture. This chromed, OEM-style twist-on cap is a direct replacement for the CB175, CL175 Scrambler, SL175, CB350, CL350 Scrambler, CB450, and CL450 Scrambler twins that came with the screw-on cap.

Specifications

Spec	Detail
Style	Twist-on (screw-on), OEM-style
Finish	Chrome
Fits Models	CB175 K0, K3–K7 (1968–1973); CL175 Scrambler K0, K3–K7 (1968–1973); SL175 K0–K1 (1970–1972); CB350 K0–K2 (1968–1970); CL350 Scrambler K0–K2 (1968–1970); CB450 K0–K2 (1965–1969); CL450 Scrambler K0–K2 (1967–1969)
Replaces OEM Parts	17620-402-020, 17620-259-000, 17620-292-020, 17620-317-000, 17620-329-000, 17620-329-010, 17620-402-000, 17620-402-010, 17631-329-003, 17631-259-000, 17631-329-000
Sold As	Individually

Note: This is the twist-on (screw-on) cap. It is not the later hinged flip-top cap, and the two aren’t interchangeable. If your tank has a hinged cap held by a latch, you need our Honda Flip Top-Style Gas Cap instead.

Model-Specific Notes

• CB350 / CL350 and CB450 / CL450: Used this twist-on cap through K2. The K3 and later models switched to the hinged flip-top cap.
• CB175 / CL175: Used the twist-on cap across the full model run.
• Does NOT fit: CB360 / CL360, CJ360, CB500 / CB550 / CB750, or any model that came with a hinged flip-top cap. Those use the flip-top cap.

Installation

Difficulty: Beginner

1. Unscrew and remove your old gas cap.
2. Thread the new cap onto the filler neck and tighten it down by hand.

Frequently Asked Questions

How do I know whether my Honda uses a twist-on cap or a flip-top cap?

The twist-on cap screws onto the filler neck and lifts straight off. The flip-top cap is hinged and stays attached to the tank with a latch. Honda used the twist-on cap on the CB175 and CL175 across their full run, and on the CB350, CL350, CB450, and CL450 through K2. The K3 and later 350s and 450s — along with the CB360, CJ360, CB500, CB550, and CB750 — came with the flip-top cap.

Can I put this twist-on cap on a bike that came with a flip-top cap?

No — the twist-on (screw-on) cap and the hinged flip-top cap aren’t interchangeable. If your tank has a flip-top cap, use our flip-top gas cap instead.

Does this cap come with a seal or gasket?

It ships complete and ready to install — no separate seal or gasket needed.

Will this fit my CB360 or CJ360?

No. The CB360, CL360, and CJ360 came with the flip-top cap, not the twist-on. You’ll want our flip-top gas cap for those models.

You Might Also Need

• Petcock | Honda CB350 / CL350 / SL350 — fuel valve for the 350 twins
• Petcock | Honda CB450 / CL450 — fuel valve for the 450 twins
• Petcock Rebuild Kit (Original Keihin) | Honda 350 / 360 / 450 — rebuild a leaking or weeping petcock
• Petcock Fuel Filter Screen — keeps tank debris out of your carbs
• Clear Poly Fuel Line (5.5mm) — replace cracked or brittle fuel line

Last updated: June 2026