Description
Throttle Return Spring (Rotax Part No. 938288)
Description
A genuine return spring designed for the throttle valve in Bing carburettors used on Rotax 912, 912UL(S), and 914 engines. It provides reliable force to close the throttle valve and maintain smooth part-throttle control.
Key Features
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Designed to exact Rotax specifications for Bing 64 carburettors
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Constructed from corrosion-resistant spring steel for longevity
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Compatible with throttle systems on 912, 912UL, 912ULS, and 914 engines Maintains throttle valve in correct position, preventing “creep” under vibration
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Ensures smooth, predictable throttle response and control
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Easy to inspect and replace during routine carburettor maintenance
Application Notes
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Inspect contact surfaces (“horns”) on choke and throttle lever for wear each service — sleeves may be needed to prevent hole wear
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Some operators choose lighter aftermarket springs to reduce lever tension and better control throttle creep — OEM spring maintains original performance balance
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Install across throttle shaft per Rotax carburettor service guidelines
