A humming or whining gearbox noise at highway speed on your Kaiyi E5 usually points to fluid condition, bearing wear, or CVT pulley/chain issues. Here’s what to check first and when to stop driving.
What a highway-speed gearbox hum usually means
A hum or whine that rises with road speed—especially around 60–100 km/h—is often a sign of something in the gearbox’s rotating assembly or fluid system rather than a random sensor glitch. On a Kaiyi E5 with a CVT, the usual suspects are degraded or low CVT fluid, worn pulley/chain contact surfaces, final-drive or bearing wear, or a failing input/output speed sensor causing incorrect ratio control. If the noise changes with throttle but not with engine RPM, that points more toward the transmission or final drive; if it follows engine RPM in a fixed gear, check engine and accessory areas too.
