Zenith 267 Carburetor Economizer System Guide
The economizer system in the Zenith 267 carburetor is an important fuel-saving feature designed to give your engine extra fuel only when it needs it — like under heavy load or full throttle — while conserving fuel during light cruising or part-throttle operation.
How the Zenith 267 Economizer System Works
At low and medium throttle openings, the economizer system remains closed, allowing the engine to run on the normal idle and main metering circuits for maximum fuel efficiency. When you press the throttle wide open or the engine is under heavy load, the increased manifold vacuum opens the economizer valve or power jet.
When the valve opens:
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Extra fuel bypasses the main jet restriction.
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The richer fuel mixture provides the additional power the engine needs for climbing hills, heavy pulling, or sudden acceleration.
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This system helps prevent the engine from running too lean under high-load conditions, which can cause pinging, overheating, or power loss.
Common Zenith 267 Economizer System Problems
1. Poor Power Under Load:
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If the economizer valve is stuck closed, the engine won’t get the extra fuel it needs at full throttle.
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This can cause hesitation, backfiring, or power loss when accelerating.
2. Excessive Fuel Consumption:
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If the economizer valve is stuck open or leaking, your engine may run too rich even when cruising at light throttle.
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This leads to poor fuel economy and black exhaust smoke.
3. Rough Idle or Hard Starting:
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A leaking economizer valve can bypass fuel into the intake even when the engine is idling, flooding the mixture.
How to Maintain the Zenith 267 Economizer System
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Inspect the economizer valve or power jet during a rebuild to ensure it moves freely and seats properly.
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Replace worn seals, springs, or linkages that may cause leaks.
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Use high-quality, ethanol-resistant rebuild parts to prevent sticking caused by modern fuel.
Why the Economizer System Matters
A properly working economizer system ensures your Zenith 267 carburetor balances power and fuel efficiency. It keeps your engine running lean and clean when cruising, but rich and strong when you need maximum performance.
