Zuma clutch question
Posted: Tue Nov 17, 2015 12:33 pm
Hi all,
I have a stock 2003 50cc Zuma, with 10k miles. It has had a new top end and Yamaha belt about 1500 miles ago. The only non OEM part is a complete polini 2 shoe adjustable spring, clutch assembly including bell, PO owner installed that. That was disassembled, cleaned and regreased. I am running 7 gram weights and a white malossi main spring and blue (I assume Polini) clutch springs. The scooter runs and starts good, but I am being passed by every stock rental POS Zuma on the island. According to the speedo at wot I am going 34-35 mph, not sure I believe it. If I try a lighter main spring it boggs down. I weight 145lbs. I have 5.5, 6 & 7 gram weights. I did try lighter weights but that seemed to affect my top end. Am I correct in my thinking that heavier weights would help increase top end by moving the belt out farther out and lighter weights help with take-off. I did tighten the nuts 1 turn for the clutch springs to add more spring load but not sure what that does. My questions are, what does adding more or less clutch spring load do and if anybody has any suggestions on what else to add please let me know. My only thing is I want to stay stock I will change weights, main spring or clutch spring. The other reason for this is my wife has a stock 99 Elite and I want to keep up with it.
Thanks
I have a stock 2003 50cc Zuma, with 10k miles. It has had a new top end and Yamaha belt about 1500 miles ago. The only non OEM part is a complete polini 2 shoe adjustable spring, clutch assembly including bell, PO owner installed that. That was disassembled, cleaned and regreased. I am running 7 gram weights and a white malossi main spring and blue (I assume Polini) clutch springs. The scooter runs and starts good, but I am being passed by every stock rental POS Zuma on the island. According to the speedo at wot I am going 34-35 mph, not sure I believe it. If I try a lighter main spring it boggs down. I weight 145lbs. I have 5.5, 6 & 7 gram weights. I did try lighter weights but that seemed to affect my top end. Am I correct in my thinking that heavier weights would help increase top end by moving the belt out farther out and lighter weights help with take-off. I did tighten the nuts 1 turn for the clutch springs to add more spring load but not sure what that does. My questions are, what does adding more or less clutch spring load do and if anybody has any suggestions on what else to add please let me know. My only thing is I want to stay stock I will change weights, main spring or clutch spring. The other reason for this is my wife has a stock 99 Elite and I want to keep up with it.
Thanks