Less stiff clutch center spring?

[dodge]

Looking to lower rpms and possibly gain a few MPGs... The 21G rollers added a few mph top end, but am told changing out this clutch spring might help as well? The stock rollers weigh 19.8 BTW. Is the spring that comes on the PCX the same tension as the stock ADV 150's?

thanks

[gazmo16]

Yes it's the same although you can get 3 springs here in Thsiland, 1000,1500 and 2000 which are colour coded. I found the original rollers too heavy and went lighter for a small top end loss but better acceleration and better fuel economy.