Oil Seal Kit | Honda CB350 / CL350 / SL350
Forty years of heat cycles turn the original engine oil seals hard and brittle, and a Honda twin that drips onto the garage floor is doing its best British-bike impression. This kit replaces every oil seal in the CB350 / CL350 / SL350 engine so you can button it back up leak-free.
Why You Need This
Oil seals are rubber, and after 40+ years the originals dry out, shrink, and crack — so the engine starts weeping at the shift shaft, the tach drive, the kick-start shaft, and every other spot a shaft passes through the cases. If you’re splitting the cases for a rebuild, replacing all of them at once is cheap insurance: the seals are a few dollars, and pulling the engine a second time to chase one leak is not. This kit covers all eight engine oil seals in one shot.
Specifications
| Spec | Detail |
|---|
| Fits Models | CB350 / CL350 (1968–1973, K0–K5), SL350 K0 (1969–1970), SL350 K1–K2 (1971–1973, see note) |
| Replaces OEM | 91202-286-023, 91211-286-003, 91204-286-003, 91205-286-003, 91205-286-005, 91206-286-013, 91210-286-003, 91203-292-003, 91201-292-003 |
| Sold As | Complete kit — all 8 engine oil seals |
Important Note — SL350 K1 & K2
The 1971–1973 SL350 K1 and K2 use a different output shaft seal than the one in this kit. If that’s your bike, contact us and ask for part #4010 — we’ll substitute the correct output shaft seal into your kit before it ships.
What’s in the Kit
Every oil seal in the CB350 / CL350 / SL350 engine:
- Camshaft End Seal
- Tachometer Cable Seal
- Kick Start Lever Seal
- Drive / Output Shaft Seal
- Gear Shift Shaft Seal
- Neutral Switch Shaft Seal
- Clutch Pushrod Seal
- Clutch Lifter Dust Seal (included, not pictured)
Installation
Difficulty: Intermediate — these go in while the engine cases are apart for a rebuild.
- Thoroughly clean the seat where each seal fits — any old sealer, grit, or burrs will cause the new seal to leak.
- Put a light coat of a liquid gasket sealer like our Honda Bond 4 on the outer circumference of the seal before pressing it in.
- Tap each seal squarely into place using a socket just a little smaller than the seal’s outer diameter as a driver, so it seats flat without cocking.
You can watch several of these seals going in during our CB350 / CL350 bottom-end rebuild:
Frequently Asked Questions
Which seals come in the kit?
All eight engine oil seals: camshaft end, tachometer cable, kick start lever, drive/output shaft, gear shift shaft, neutral switch shaft, clutch pushrod, and the clutch lifter dust seal. It covers every oil seal in the engine.
Can I buy individual seals instead of the whole kit?
We sell it as a complete kit. If you only need a specific seal, contact us — we can sometimes put together a custom order, but the standard offering is the full set.
Do I also need the gasket kit?
For a full engine rebuild, yes. The oil seals stop leaks where shafts pass through the cases; the gaskets seal the mating surfaces between the cases and covers. You’ll want either the overhaul gasket kit or the service gasket kit alongside these seals, plus a sealer like Honda Bond 4 to finish the job.
I have an SL350 — does it fit?
The SL350 K0 (1969–1970) is covered by the kit as-is. The SL350 K1 and K2 (1971–1973) use a different output shaft seal — contact us and ask for part #4010 and we’ll sub the correct one into your kit.
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Last updated: July 2026
