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Intake Manifold Pipe for Honda Helix CN250 & Elite CH250 | OEM 16210-KS4-840
Intake Manifold Pipe for Honda Helix CN250 & Elite CH250 | OEM 16210-KS4-840
4.5 / 5.0
(2) 2 total reviews
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Product Overview
Keep your classic Honda touring scooter on the road with this high-durability Carburetor Intake Manifold Pipe. Specifically designed for the legendary CN250 Helix and CH250 Elite, this part is a direct replacement for OEM #16210-KS4-840 and #16210-KM1-010. These liquid-cooled 250cc engines generate significant heat; over time, the factory intake boot can harden and crack, causing vacuum leaks that lead to hard starting and stalling. Our manifold is engineered with high-strength, heat-resistant materials to restore your scooter’s smooth idling and reliable performance
Product Compatibility
Direct replacement for Honda 250cc 4-stroke liquid-cooled scooter engines. Please verify your OEM code.
| Brand | Model | Fitment Years | Replaces OEM Part # |
| Honda | CN250 Helix | 1987 – 2007 | 16210-KS4-840 |
| Honda | CH250 Elite | 1985 – 1988 | 16210-KM1-010 |
| Other Brands | CF250 / V3 / V5 | (Chinese 250cc Clones) | 16210-KS4-840 |
Specifications
| Feature | Detail |
| OEM Reference | 16210-KS4-840 / 16210-KM1-010 |
| Material | High-Strength, Corrosion-Resistant Synthetic Rubber |
| Construction | Reinforced Interior with Precision-Sealing Flange |
| Properties | Anti-Aging, Crack-Resistant, High-Pressure Tolerance |
| Fitment Type | Direct Bolt-on Replacement |
Key Features
- High-Temperature Resilience: Crafted from premium materials designed to thrive in the high-heat environment of a liquid-cooled 250cc engine bay, effectively preventing the drying and cracking common in older scooters.
- Leak-Free Vacuum Seal: Precision-manufactured to ensure an airtight connection between the carburetor and cylinder head, eliminating the lean-run conditions that cause "popping" and engine hesitation.
- Strict Quality Control: Every unit undergoes rigorous testing to ensure it withstands high-pressure intake cycles, providing a reliable and long-lasting riding experience.
- Corrosion-Resistant Design: The specialized rubber compound is engineered to resist degradation from modern ethanol fuels and engine oils, significantly prolonging the product's service life.
- Restores Smooth Idling: By stabilizing the air-intake volume, this manifold helps restore the smooth, whisper-quiet idle that the Honda Helix is famous for.
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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 250cc 4-stroke liquid-cooled scooter engines. Please verify your OEM code.; Fitment Years; Replaces OEM Part #; Honda; CN250 Helix; 1987 – 2007; 16210-KS4-840. Listed year information includes 1987–2007, 1985–1988, 1987, 2007, 1985. It is best matched to original part number(s) 16210-KS4-840, 16210-KM1-010. Key physical/spec details from the product data include 250cc. 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 16210-KS4-840, 16210-KM1-010 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 CN250/CH250 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 16210-KS4-840, 16210-KM1-010, treat the fitment as unconfirmed. Model years outside 1987–2007, 1985–1988, 1987, 2007, 1985 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): 16210-KS4-840, 16210-KM1-010. Recheck listed specs such as 250cc. If any connector, mounting point, size, or year detail is different, confirm fitment before installation.
The vacuum nipple on this purchase was double the size of the OEM one off of the scooter, so I had to change the size of the vacuum lines and connectors in the carburetor area of the unit. Not a super big deal, but just be aware that you're probably facing the same issue, at least if you're working on a CN 250 Helix.
This intake boot is an item that does eventually need replacement on a Honda Helix which is why I ordered this without an immediate need. On inspection it visually seemed up to par in terms of being made from heavy duty rubber, having a flat, machined mating surface, etc. I could not find anything wrong on inspection, thus the five star rating.Eventually I did compare this item side by side with another brand identical part, reportedly genuine Honda OEM. One difference is that this part does not include the metal clamp while the Honda OEM part included the clamp. That's not a problem as long as the old clamp can be re-used, which usually it can. The only other difference I could discern was that the Honda OEM part seemed to have just a tad harder rubber. The rubber thickness of both was identical, and hardness nearly identical, but maybe just a hair of difference in the rubber's density. They were so close I might have just imagined it.While time will tell eventually how well this part performs after thousands of miles, based on the side by side inspection with another part I have confidence in this product's quality. Finally, the current $12.59 price seems reasonable.