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DIAPHRAGM KART CARBURETORS: BIG TRUTHS (AND MYTHS!) ABOUT CARBURETION, MAINTENANCE AND ADJUSTMENTS – PART 2
Second episode (of six!) of the "True or False" series of articles dedicated to diaphragm carburetors for karting (did you miss the first? Here it is: "Diaphragm kart carburetors: big truths (and myths!) about carburetion, maintenance and adjustments – Part 1"). Keith McCloughry, product engineer at Tillotson, a leading manufacturer of FIA-approved diaphragm carburetors for Karting and other applications, answers questions like: “The stiffness of the needle spring in a diaphragm carburetor only affects the idle speed”, or “To improve cold starting with a diaphragm carburetor, simply cover…”.
Editor's Note
For those who want to delve deeper into the operation of the diaphragm carburetor, the article "The Diaphragm Carburetor" is available in the "Technical" section of TKART Magazine. This article describes its structure and operating principles. Reading it can be helpful in better understanding the topics covered in this "True or False" series of articles, especially for novice karters.
Editor's Note 2
The answers provided in this series, while sometimes referring to components or solutions developed by the manufacturer Tillotson, are based on technical principles that apply to all diaphragm carburetors, regardless of manufacturer. Anyone who uses this type of carburetor, whether amateur or competitive, will therefore find this guide useful tips for optimizing carburetion, avoiding common mistakes, and better understanding the operation of a fundamental component in karting.
The main diaphragm (also known as the dosage membrane) does move due to vacuum generated by engine crankcase
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