Husqvarna carburetor replacement 531215601 / 506450401 for 445 445e 450 450e — OEM direct-fit restores starting & idle

Genuine Husqvarna 531215601 carburetor (OEM 506450401) is a direct-fit replacement designed to restore fuel delivery and throttle response on Husqvarna 445, 445e, 450 and 450e chainsaws.

When a worn or damaged carburetor causes hard starting, poor idling, or weak power, fitting an authentic replacement part can quickly return your saw to reliable operation. This listing is for a new, genuine Husqvarna carburetor—factory-specified to match the original equipment's tolerances and fuel passages so you don’t have to modify linkage or adaptors. The part number cross-reference includes 531215601 and OEM 506450401, confirming compatibility with the specified model years and engine setups.

How will this carburetor affect starting and idle behavior?

Installing this genuine Husqvarna carburetor typically improves cold starts and produces a steadier idle because the fuel metering and choke functions match factory calibration. You should notice reduced stumbling at low throttle and cleaner transition to higher revs when the carburetor is functioning correctly.

• Restores correct fuel/air mixture for reliable cold starts.
• Stabilizes idle RPM and reduces hunting or stalling.
• Preserves throttle response identical to original equipment.

Will this unit fit my chainsaw model without modifications?

Yes—the carburetor is an exact OEM replacement for Husqvarna 445, 445e, 450 and 450e where the manufacturer specifies part 506450401 or 531215601. It is built to the same mounting points and linkage geometry as the original, so replacement is usually bolt-on with no drilling or alterations needed.

• Direct-fit for listed Husqvarna models—no adaptors required.
• Includes factory inlet and outlet port placements matching hose routing.
• Compatible with original throttle and choke linkages for quick swap.

What should I check during installation and setup?

During replacement, verify that fuel lines, gaskets and the air filter are in good condition; contaminated lines or worn seals can mask carburetor performance. After mounting, follow the saw’s manual for initial idle and mixture adjustments, and perform a safety check before full-throttle operation.

• Replace brittle fuel lines and inspect connector clamps.
• Install a new gasket or O-ring if the old seal shows wear.
• Adjust idle and high/low speed screws per manufacturer guidance.

How does buying a genuine Husqvarna part benefit long-term maintenance?

Genuine parts are manufactured to the original specifications, minimizing leaks, misalignment and premature wear that can occur with aftermarket alternatives. Using the OEM carburetor helps maintain factory performance and simplifies troubleshooting because the component behaves as the service manual describes.

• Factory-quality materials reduce the risk of fuel leakage and vapor lock.
• Exact tolerances improve longevity and predictable tuning behavior.
• Maintains resale value and equipment warranty considerations where applicable.

Who is this for: This carburetor is aimed at owners and technicians maintaining Husqvarna 445, 445e, 450 or 450e chainsaws who want a straightforward, reliable OEM replacement. It’s a suitable purchase for professionals needing a rapid fix between jobs and for homeowners who prefer factory-spec parts to keep their saw running like new. If you’re replacing a leaking, clogged, or damaged carburetor and require a one-to-one match with original Husqvarna specifications, this part meets those needs.