The CT90 routes intake air through a chain of rubber boots from the carburetor back to the luggage rack, and every joint in that chain is held by a clamp. When a clamp stops holding, that joint is no longer sealed. This set covers all four positions on CT90 K2–K6 and 1976–1979 models.
Unlike the twins, the CT90's intake path runs the length of the bike — carburetor to carb boot, carb boot to air box, air box to luggage rack boot, and luggage rack boot to the luggage rack itself. That's four separate clamped joints, and a failure at any one of them means a joint that no longer holds.
Factory clamps for these positions get pricey. Pick the positions you need at checkout, or take the full set and do the whole path at once.
Note on the air box side of the carburetor boot. Honda originally used a pre-formed elliptical clamp in that position. The round clamp in this set still works there — pre-bend and shape it to match before you install it.
Difficulty: Beginner
Do not over-tighten. Too much clamping force distorts the boot and shortens its life.
No. Each position is a separate checkbox at checkout, so you can order only the joints you're replacing. If you're refreshing the whole intake path, take all four.
The carburetor-boot-to-carburetor joint uses #6125. The other three positions use #6126, which is the same clamp we sell for the Honda CB350 / CB360 / CB450 twins — it's the correct part in those three CT90 locations.
A pod filter is an alternative to running the factory air box, so the positions you need depend on what's still on the bike. Check which of the four joints your setup actually has before ordering.
A clamp only holds a joint together — it can't compensate for a boot that has hardened or split. Inspect the boots themselves and the filter element as well.
Last updated: July 2026
