Mine must not be. The choke does not back off even after driving 40 miles so I know it's getting warmed up. Is there an adjustment on the choke element/housing? It's just a spring type heating element, correct? Not much can get out of whack with those. They either work or they don't. I believe everything is adjusted properly at the carb. Clearances look good at the choke plate with the fast idle cam on the second step and choke pull off diaphragm appears to function as it should. Thanks for the info!