You probably have a slight drag between the flywheel and the clutch disc when the pedal is fully depressed. Here's a sneaky trick. At a stop, put the shifter into second gear, THEN quickly pull it back into 1st. without any hesitation in the neutral gate. It will drop right into gear with little or no grind. If the problem is from lack of exercise of the clutch, the problem should clear up within a few miles of driving as the parts develop a running fit with each other. Engaging 2nd. momentarily stops the cluster gear from spinning, which is probably what is causing the grind.
Jerry
