Hello everybody,
Sagging of front fork.
I buy '(may 2021) a second hand Kymco GT300i with 7500 miles. On the road , if small hole or small bump , my front fork was noisy ( knocking) and i reach the the full stroke of the fork ( around 100mm = 4 inches). I put new oil SAE20 but same problem. ( I know my own weight is around 200lbs !!!).
I took few measurements:
Free stroke of the fork = 4 inches with spring found in place, ref : 51401-LGE5-E00 ; sagging with bike own weight = 2 inches ; sagging with me on the bike = 3.2 inches . So only 0.8 inch left for ridding.
I decide to put 2 stronger springs.
New spring ( same lengh , same outeside diameter; wire diameter= 11/64 inch), ref ; 51401-LDH1-E00. Sagging with bike own weight = 0.8 inches ; sagging with me on the bike = 1.5 inches , maximun stroke during heavy braking 3.2 inches.
Road test : no noise , even on holes and bumps. I am happy.
I hope this feedback will be useful.