Air Filter (Angled Boot Pod) | Honda CB350 / CL350 / SL350

Description

Angled Boot Pod Air Filters | Honda CB350 / CL350 / SL350

A missing, crumbling, or incomplete factory airbox is one of the most common problems on a long-parked CB350. The factory setup is a glued assembly of rubber boots, a filter element, metal covers, and a crossover rod — and once it’s gone, the whole thing has to be replaced as a unit. These angled boot pod filters are the clean way to do it: a washable pair that fits under your factory battery box and side covers.

Why You Need This

The CB350, CL350, and SL350 run CV carburetors, and CV carbs are particular about what’s bolted to their inlet. Many universal straight-boot pods block the air passages that drive the slide and diaphragm, which makes throttle response inconsistent. The angled boot acts like a runner, funneling air cleanly into the carb mouth the way the factory boot did — so the carbs work the way they were designed to. The filters are washable and reusable, so you clean them instead of hunting for paper elements that may no longer be made.

Because the boot is angled, the filters tuck into the tight space between the carburetors and the battery box, and you can rotate them to clear the factory side covers — so the bike keeps its original look without an airbox.

Specifications

Note: SL350 fitment is K0 only. The SL350 K1 and K2 use a different carburetor — see the FAQ below.

Installation

Difficulty: Intermediate

Tools needed: 10mm wrench, plus an M6 rod (about 10 3/4″) to replace the factory crossover rod

1. Remove the factory air filter assembly: take off the metal airbox cover, the long crossover rod that runs through the battery box, the top mounting bolt, and the boot clamp screw.
2. Slide a pod boot onto each carburetor inlet, pushing it on as far as it will go.
3. Clock the pods upward if you’re running the factory side covers, then snug the clamp with the screw at the bottom for easy access. Do not over-tighten — squeezing the rubber pushes the filter off the end of the carburetor.
4. Replace the factory crossover rod with a longer M6 rod (about 10 3/4″) secured with lock nuts. This holds the side covers in place now that the air filter assemblies are gone. Fit new side cover grommets if the originals are brittle.

Support the carburetors. The factory airbox boots used to hold the carbs up. With them gone, hang a wire support over the frame attached to the front of each carburetor so the carbs don’t pull out of the intake manifolds.

Full step-by-step instructions are in our CB350 / CL350 / SL350 pod filter install guide.