I'm attaching an LTspice file that simulates a crystal oscillator with resonant frequency 1MHz, and it works fine. But if I change L1 from 2.5 H to 9.8 mH to simulate a crystal oscillator with resonant frequency 16MHz, it flat-lines (no oscillations). If I replace the CMOS inverter with a custom model for a chip like the 74HCU04, it works. I tried a few different MOSFET's, turning off initial operating point computation (uic), starting with the supply at zero (startup), and starting with different IC's. In every case there is no oscillation. Any tips would be greatly appreciated.