Aftermarket Petcock | Honda CB350 / CL350 / SL350
Leaking fuel, stuck lever, or a petcock so corroded the screen is falling apart? This aftermarket replacement petcock is a direct-fit replica of the original Keihin fuel valve used on Honda CB350, CL350, and SL350 twins from 1968 through 1973. It arrives ready to install with new rubber seals and a filter screen already in place — no rebuild required.
Why You Need This
Original Honda petcocks on these bikes are now 50+ years old. Rubber seals dry out and crack, lever gaskets weep, and brass filter screens corrode or collapse. A leaking petcock drips fuel onto hot engine cases (a fire risk), and a clogged filter screen starves the carburetors at higher RPMs, causing stumbling and stalling. This aftermarket petcock solves both problems with fresh seals and a new screen right out of the box.
If your original OEM petcock is in good shape and just needs new seals, we also sell the OEM petcock rebuild kit and a replacement brass filter screen.
Specifications
| Spec | Detail |
|---|
| Replaces OEM Part Numbers | 16950-292-000, 16951-292-000, 16953-298-000, 16961-298-000, 16950-343-670, 90303-268-000 |
| Fits Models | CB350 K0–K5 (1968–1973), CL350 K0–K5 (1968–1973), SL350 K0–K2 (1969–1973) |
| Sold As | Sold Individually |
| Includes | Petcock body, lever, rubber seals, filter screen |
| Design | OEM Keihin-style replica |
Note: This petcock flows enough fuel to supply the carburetors at full throttle. The built-in filter screen is all the filtration you need — inline fuel filters on the fuel lines are not necessary.
Note: A rebuild kit for this CMC aftermarket petcock is also available if your CMC petcock needs new seals down the road. That kit is specific to this aftermarket petcock — it will not fit the OEM Honda petcock (and vice versa).
Installation
Difficulty: Beginner
- Turn the fuel cock lever to the STOP position and remove the fuel line from the old petcock.
- Drain any remaining fuel from the tank into a safe container.
- Remove the old petcock from the tank.
- Clean the mounting surface on the tank — make sure it is free from old gasket material, rust, and debris.
- Rub a small amount of fresh oil on the new petcock-to-tank gasket so it seats smoothly during installation.
- Install the new petcock onto the tank. When tightening, make sure not to pinch the wavy washer between the petcock body and the faceplate. The large nut installs smooth side up and threads on counterclockwise by only about half a turn.
- Reconnect the fuel line and turn the lever to ON or RES to check for leaks before starting the engine.
Before installing a new petcock, clean your fuel tank. Rust, varnish, and sediment inside the tank will clog the new filter screen and shorten the life of the petcock. If cleaning the tank with vinegar, remove the petcock first — the acid can damage the petcock seals and internal components.
Our gas tank cleaning video walks through the full process of cleaning a rusty vintage Honda fuel tank using household white vinegar — including how to protect the petcock during cleaning.
Frequently Asked Questions
Does this fit the CB350F (the four-cylinder)?
No. The CB350F is a four-cylinder model and uses a different petcock from the CB350 / CL350 / SL350 twins this part is designed for. The CB350F is not currently covered by any of our aftermarket petcock variants.
What is the difference between this aftermarket petcock and the OEM Honda petcock?
This is a replica of the original Keihin fuel valve. It uses the same mounting pattern, lever positions (ON / RES / STOP), and filter screen design as the original. It arrives with new seals and a screen already installed, so it is ready to use right out of the box. If you want to keep your original OEM petcock, we sell rebuild kits and replacement filter screens for the factory unit.
Do I need an inline fuel filter with this petcock?
No. The internal filter screen is designed to provide all the filtration needed to keep debris out of your carburetors. Adding an inline fuel filter is unnecessary and can restrict fuel flow at higher RPMs.
Can I rebuild this petcock if it starts leaking later?
Yes. We sell a rebuild kit specifically for this CMC aftermarket petcock that includes a lever gasket, sediment bowl O-ring, and petcock-to-tank gasket. Note that this rebuild kit only fits the CMC aftermarket petcock — it will not fit the OEM Honda petcock, and the OEM rebuild kit will not fit this aftermarket petcock.
You Might Also Need
Last updated: May 2026
