I seeked help from Hiro and he gave me some good advice in terms of how to identify the grinding sound between neutral & 1st gear. Here are Hiro's suggestions:
"It is a good time to see if the gears mesh perfectly and how the noise can be generated by turning the motor by hand, shifting the gear through 1st to 4th from neutral. I am doubting the gears on the selecting rod installed with improper alignment. In case, the noise comes from the grind between the gears and shift cross. Assuming the noise can be heard during the acceleration with fully engaged clutch.
Once again, I will doubt the clutch unit if the half engaged clutch generates the noise.
I doubt the improper alignment between 1st and 2nd gear (which should have room for the neutral) or worn gears(both gears on the cush drive and the gear shift)/shift cross. I need to check if the gear cable adjustment and the condition of the waved (which align the gear location) dishes in the gear cable adjustment unit. There is a possibility that the peak(s) between the neutral position and the 1st position was worn badly and can not stay in the 1st position to grind inside the gear on shift unit."
Thank you Hiro!
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