Carburetor Gasket & O-Ring Kit | Honda CB175 / CL175 / CB200
Dried-out gaskets and hardened O-rings are the most common cause of fuel leaks and vacuum leaks on the Keihin slide carburetors used on the Honda CB175, CL175, SL175, CB200, and CL200. This kit replaces every soft seal in one carburetor — float bowl gasket, slide cover gasket, intake O-rings, and sealing washers — so you can stop the leaks without replacing the brass and steel internals.
Why You Need This
After decades of sitting, the original rubber gaskets and O-rings in your Keihin carburetors harden, shrink, and crack. The float bowl gasket leaks fuel. The intake O-rings allow air leaks that make the bike run lean. The slide cover gasket deteriorates and lets dirt in from the top. Replacing these seals is the first step in any carburetor service — and often all you need to get a sitting bike running again.
If the brass components inside your carburetors are also corroded or damaged, consider our complete Carburetor Rebuild Kit instead — it includes everything in this gasket kit plus main jets (3 sizes), idle jet, slide needles, emulsifier tube, discharge nozzle, and float needle and seat.
Specifications
| Spec | Detail |
|---|
| Replaces OEM Part Numbers | 16010-304-305, 16010-304-004, 16010-355-004 |
| Fits Models | CB175 K3-K7 (1969-1973), CL175 K3-K7 (1969-1973), SL175 K0-K1 (1970-1972), CB200 / CB200T (1973-1976), CL200 (1974) |
| Sold As | Individual kit (one carburetor) — order two for both carbs |
| Carburetor Type | Keihin piston-valve slide carburetor (PW 20 / PW 22) |
Note: Kits are sold individually. Your bike has two carburetors — you need two kits to service both.
What's in the Kit
- Float bowl gasket
- Slide cover gasket
- Sealing washers:
- Float needle seat washer
- Float bowl drain screw washer (early-style carbs)
- O-rings:
- Carburetor body to intake runner
- Intake runner to cylinder head
- Float bowl drain plug O-ring (late-style carbs)
Early vs. late drain plug: Earlier carburetors use a small-head drain screw with an aluminum crush washer. Later carburetors use a large-head drain screw sealed with an O-ring. This kit includes both styles so you are covered regardless of which version your carbs have.
Installation
Difficulty: Beginner — if your carbs are already off the bike and cleaned
- Remove the carburetors from the bike and disassemble — remove the float bowl, slide cover, and all old gaskets and O-rings.
- Clean the carburetor body thoroughly. Every passage and jet must be spotless before reassembly.
- Install the new float bowl gasket, slide cover gasket, intake O-rings, and sealing washers from this kit.
- Use a drop of oil on each O-ring during installation to help them seat properly and prevent pinching.
- Set the float height to 21 mm before reinstalling the float bowl.
- Reassemble and reinstall the carburetors on the bike.
Do not overtighten brass fittings. The carburetor body is a soft zinc-aluminum casting — thread the drain plug and float needle seat until you feel them snug, then stop.
Watch our full CB175 / CB200 Keihin carburetor assembly walkthrough — covers gasket and O-ring installation, float height adjustment, and drain plug sealing for both early and late-style carbs.
Frequently Asked Questions
What is the difference between this gasket kit and the full carburetor rebuild kit?
This kit contains only the soft parts — gaskets, O-rings, and sealing washers. The full Carburetor Rebuild Kit includes everything in this kit plus all the brass and steel components: main jets (3 sizes), idle jet, slide needles (175-specific and 200-specific), emulsifier tube, discharge nozzle, float needle and seat, and idle air bleed screws. If your carbs just need fresh seals, this gasket kit is all you need. If the brass is corroded or the jets are damaged, go with the full rebuild kit.
Do I need one kit or two?
Two. Your CB175 / CL175 / CB200 has twin carburetors — one per cylinder. Each kit services one carburetor, so order two kits to do both.
Does this kit fit the CB175 K0 or CL175 K0?
No. This kit fits CB175 K3 through K7 (1969-1973) and CL175 K3 through K7 (1969-1973). The K0 models used a different Keihin carburetor with different gasket dimensions.
Will this work on aftermarket carburetors?
No. This kit is designed for the factory Keihin piston-valve slide carburetors originally equipped on these Honda models. Aftermarket carburetors (Mikuni, etc.) use different gasket sizes and O-ring dimensions.
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Last updated: March 2026
