About the Honda SL350 Motosport
Identify the fork generation, then compare seal outside diameter and height before selecting the replacement.
Use the original K0 and K1 equipment as clues
The reproduced U.S. Honda guide describes K0 with a single-downtube frame, electric and kick starting and CV carburetors; K1 has a double-downtube frame, no electric starter and piston-valve carburetors. Published starting frames are SL350-1000001 and SL350-2000001 respectively. Record any replacement engine or front end independently.
The later K1 fiche creates a separate height check
The linked USA K1 fork fiche changes from 91255-312-003 through frame 2041449 to 91255-312-013 from 2041450, describing the later seal as 33 × 46 × 12.5 mm. The store’s 33 × 46 × 11 mm pair is not confirmed as an equivalent merely because the year and diameters agree.
Parts and model differencesSL350 fork order: compare the listing with the fitted seal
| Part / original-fork checkpoint | Listed years or serial | Ordering decision |
|---|---|---|
| 33 × 44 × 8.9 mm oil-seal pair | SL350 1969–1970 | Two seals; match all three dimensions to the installed fork. |
| 33 × 46 × 11 mm oil-seal pair | SL350 1970–1971 | Two seals; 1970 overlap does not make it interchangeable with the 44 mm OD set. |
| USA K1 fiche: 91255-312-013 | From frame 2041450 | Fiche height is 12.5 mm; resolve the difference before substituting an 11 mm-high product. |
| Separate fork dust seal | SL350 1972 | Sold individually; its year range does not extend either oil-seal listing. |
Reference: Honda SL350K1 USA front-fork fiche; Honda identification-guide scans: CL360 and SL350.
Identify your motorcycle before orderingSL350 identification checklist
- Record K0/K1 identity, complete frame number and any donor-fork information.
- For K1 from frame 2041450, include a photo and full dimensions of the removed seal and its retaining arrangement.
- For engine or clutch work, record the installed engine: the gasket set lists 1971, friction plate 1970–1973 and spring set 1970–1972.