I'd be willing to bet your spur is the cause. Look for a small rock in the gear or a "chewed up" gear. It takes just the slightest deformation to make a noise.
"Whether you think you can, or think you can't, you're right." -Henry Ford
"[Driving] Genius is 1% inspiration, and 99% perspiration" -T.A. Edison
|◤ReflexRacing.net◢|◤Gravity R/C◢|◤HWNA◢|◤AVID R/C◢|