Lower Allen Bolt Kit | Honda SL350 K1/K2
The factory Phillips head screws on the Honda SL350 lower engine covers strip out — it's practically inevitable. Every time you pull a cover for routine service, you risk rounding another head. This stainless steel Allen bolt kit replaces the lower engine cover fasteners with socket head cap screws that won't strip and look clean doing it. Allen wrenches (M4 and M5) are included.
Why You Need This
Honda used Phillips head screws on the SL350 engine covers. They corrode, they strip, and they make routine maintenance harder than it needs to be. Allen (socket head) bolts grip positively with an Allen wrench — no cam-out, no stripped heads, no frustration. Stainless steel resists corrosion and keeps your engine looking sharp.
This is the Lower kit for the later SL350 (K1 and K2) — it covers the side covers (left and right), chain cover, and oil pump cover. Starting with the K1, Honda recast the SL350 side covers to remove the electric start and changed the bolt lengths, so the SL350 K1/K2 needs its own kit. The matching Upper Allen Bolt Kit is available as a checkbox add-on and covers the cam end holders, intake manifolds, cam box to cylinder head, points cover, tach drive cover, and tach cable.
Specifications
| Spec | Detail |
|---|
| Replaces OEM Parts | 93500-06035-0A, 93500-06036, 93500-06040, 93500-06040-0A, 93500-06045-0A, 93500-06045, 93500-06075-0A, 93500-06075, 93700-06040-0A, 93700-06040, 93700-05016-0A |
| Material | Stainless steel |
| Fits Models | SL350 K1 (1971), SL350 K2 (1972–1973) |
| Sold As | Complete lower kit with Allen wrenches (M4 & M5) |
SL350 K0 or a CB350 / CL350? This kit is only for the SL350 K1/K2. If you have the SL350 K0, a CB350, or a CL350, use our Lower Allen Bolt Kit (CB350 / CL350 / SL350K0) instead — those earlier covers are cast differently, include the electric starter, and use different bolt lengths.
What's in the Kit
- Side cover bolts — left & right
- Chain cover bolts
- Oil pump cover bolts
- Allen wrenches (M4 & M5)
Optional Add-On (Upper Kit) Includes:
- Cam end holder bolts
- Intake manifold bolts
- Cam box to cylinder head bolts
- Points cover bolts
- Tach drive cover bolts
- Tach cable bolt
Installation
Difficulty: Beginner
- Remove the old Phillips screws with an impact driver — this prevents stripping the heads on removal.
- Clean the threaded holes in the engine cases.
- Apply anti-seize compound to the threads of the new Allen bolts.
- Thread the bolts in by hand first, then tighten with the included Allen wrench.
- Snug evenly and do not over-tighten — these thread into aluminum cases.
Tip: If you're pulling covers for service, grab a CB350 Service Gasket Kit so you have fresh gaskets ready to go.
Frequently Asked Questions
Does this fit my SL350 K0, CB350, or CL350?
No. This kit is specifically for the later SL350 K1/K2, whose side covers were recast without electric start. For the SL350 K0, CB350, or CL350, use our standard Lower Allen Bolt Kit instead.
Does this kit cover all the engine bolts on my SL350?
No — this is the Lower kit only. It covers the side covers, chain cover, and oil pump cover. The Upper Allen Bolt Kit (available as a checkbox add-on) covers the cam end holders, intake manifolds, cam box to cylinder head, points cover, tach drive cover, and tach cable. To convert every exterior fastener, get both.
Does this fit an XL350 or another Honda model?
No. This kit is sized specifically for the SL350 K1/K2 twin. The XL350 is a single-cylinder we don't currently support, and we make separate kits for the CB175 / CL175, CB200 / CL200, CB360 family, and CB450 family.
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Last updated: June 2026
