Lower Allen Bolt Kit | Honda CB450 / CL450 / CB500T
The factory Phillips head screws on the Honda CB450 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 are included.
Why You Need This
Honda used Phillips head screws across the CB450 engine. 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 — it covers the side covers (left and right), chain cover, oil pump cover, and electric starter. The matching Upper Allen Bolt Kit is available as a checkbox add-on and covers the cam end covers, intake manifolds, valve covers, cam top roller cover, and points cover.
Specifications
| Spec | Detail |
|---|
| Material | Stainless steel |
| Fits Models | CB450 K0–K7 (1965–1974), CB500T (1975–1976), CL450 K0–K6 (1967–1974) |
| Sold As | Complete lower kit with Allen wrenches |
CB450 / CL450 K0 (Black Bomber) Owners: The K0 side covers use a few bolts that aren't in the standard kit. Check the K0 modification option at checkout to add the M6 x 75 bolt to your kit.
What's in the Kit
- Side cover bolts — left & right
- Chain cover bolts
- Oil pump cover bolts
- Electric starter bolts
- Allen wrenches
Optional Add-On (Upper Kit) Includes:
- Cam end cover bolts
- Intake manifold bolts
- Valve cover bolts
- Cam top roller cover bolts
- Points cover bolts
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: The bolts come in different lengths — return each one to the spot it came from. If you're pulling the side cover to get at the starter, plan on a fresh side-cover gasket while you're in there.
Frequently Asked Questions
Does this kit cover all the engine bolts on my CB450?
No — this is the Lower kit only. It covers the side covers, chain cover, oil pump cover, and electric starter. The Upper Allen Bolt Kit (available as a checkbox add-on) covers the cam end covers, intake manifolds, valve covers, cam top roller cover, and points cover. To convert every exterior fastener, get both.
I have a CB450 K0 Black Bomber — does this fit?
Yes, with one extra step. The K0 side covers use a few bolts that aren't in the standard kit, so check the K0 modification option at checkout to add the M6 x 75 bolt.
Which kit has the oil pump and side cover screws?
This Lower kit. The oil pump cover, side covers, chain cover, and electric starter screws are all here. The Upper kit covers the cam, valve, and points covers.
Does this fit a CB350, CB360, or another Honda model?
No. This kit is sized specifically for the CB450 / CL450 / CB500T. We make separate kits for the CB175 / CL175, CB200 / CL200, CB350 family, and CB360 family.
You Might Also Need
Last updated: June 2026
