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Intake Manifold Boot Set for Honda CB400T CB450SC CM400T | OEM 16211-447-000
Intake Manifold Boot Set for Honda CB400T CB450SC CM400T | OEM 16211-447-000
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Product Overview
Restore the smooth, vintage rumble of your Honda twin with this high-quality Carburetor Intake Manifold Boot Set. Specifically designed for the CB and CM series 400cc/450cc engines, these boots replace brittle, cracked original units that cause vacuum leaks and poor engine synchronization. By providing a perfect airtight seal between your carburetors and the engine, this set restores consistent fuel delivery, stabilizes idling, and prevents the engine from running "lean"—protecting your classic bike from overheating.
Product Compatibility
Direct replacement for Honda 400cc/450cc Parallel-Twin engines. Please verify your OEM part number.
| Brand | Model | Series / Years | Replaces OEM Part # |
| Honda | CB400T | Hawk / Hawk II (1978–1981) | 16211-413-000 |
| Honda | CB450SC | Nighthawk (1982–1986) | 16211-447-000 |
| Honda | CM400T / CM400C | Custom / Touring (1979–1981) | 16211-447-670 |
| Honda | CB450N | European Series (1985) | 16211-447-000 |
| Honda | CM450A / CM450E | Hondamatic (1982–1983) | 16211-447-000 |
Specifications
| Feature | Detail |
| OEM References | 16211-447-000, 16211-413-000, 16211-447-670 |
| Material | Premium Fuel-Resistant Nitrile Rubber |
| Base Material | Anti-Rust Coated Aluminum Alloy |
| Package Includes | 2x Intake Manifold Boots (Left & Right Set) |
| Fitment Type | Direct OEM Replacement |
Key Features
- Comprehensive OEM Compatibility: Engineered to meet or exceed factory specs for multiple Honda part numbers, ensuring a perfect fit for Hawk, Nighthawk, and CM series twins.
- Premium Rubber Compound: Made from high-density, fuel-resistant rubber that stays flexible over time and resists the cracking caused by heat and gasoline exposure.
- Restore Engine Harmony: Eliminates vacuum leaks that cause the cylinders to work against each other, allowing for perfect carburetor synchronization and smoother acceleration.
- Lightweight & Durable: Features an anti-rust and colorfast finish on all metal mounting points, ensuring a long service life even on bikes stored outdoors.
- Essential for Restoration: The perfect upgrade for vintage motorcycle projects where original rubber components have hardened or deteriorated over decades.
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Fitment FAQ
Will this part fit my specific model and year?
This intake manifold is intended for Direct replacement for Honda 400cc/450cc Parallel-Twin engines. Please verify your OEM part number.; Series / Years; Replaces OEM Part #; Honda; CB400T; Hawk / Hawk II (1978–1981); 16211-413-000. It is best matched to original part number(s) 16211-447-000, 16211-413-000, 16211-447-670. Key physical/spec details from the product data include 400cc, 450cc. Use the compatibility table and product photos together before ordering.
Do I need to match the OEM part number?
Yes. Match your original part number to 16211-447-000, 16211-413-000, 16211-447-670 before purchase. For this intake manifold, also compare the bolt spacing, intake port shape, carb-side inner diameter, vacuum nipple position, and gasket shape. This is especially important for Honda CB400T/CM400T models because similar model names can use different parts by year or trim.
What models or situations does this part not fit?
Do not order this intake manifold for machines outside the listed compatibility, or for units with different port shapes, bolt spacing, carb-side diameter, or vacuum nipple locations. If your original part number does not cross-reference with 16211-447-000, 16211-413-000, 16211-447-670, treat the fitment as unconfirmed. Model years outside 1978–1981, 1982–1986, 1979–1981, 1982–1983, 1978 should be verified separately. Do not rely only on the model name or engine size.
What should I check before ordering?
Before ordering, compare your original part with the photos and check the bolt spacing, intake port shape, carb-side inner diameter, vacuum nipple position, and gasket shape. Confirm OEM/cross-reference number(s): 16211-447-000, 16211-413-000, 16211-447-670. Recheck listed specs such as 400cc, 450cc. If any connector, mounting point, size, or year detail is different, confirm fitment before installation.
I have an old Honda CM400A which is an unusual motorcycle in that it has an automatic transmission. Additionally, the carburetors are also unique to this engine and many parts are simply not available including the intake manifolds. they are not the same size as t he CB400, they are a smaller intake dimension. I have been looking for a while now for suitable replacements and these actually fit perfectly. I was very happy to find them, and even more happy when I received them as they are very well made, with a solid metal base that is encased in the same rubber as the manifold boot. They look very much like the OEM version and they include the clamps. I would recommend these to anyone looking for this hard to find intake boot.