[quote=“stare”]I have seen clutch springs and rollers in performance shops, and would like to get them installed. What manufacturer do you guys recommend? I would like something that is very good quality. Also what effect, does it have on your scooter, when the weight of the rollers wear down.
I recommend the brand “KOSO” for the weight rollers. Yamaha’s suck, they wear down too fast. I also recommend changing the rollers first. Do NOT change both the rollers and the spring at once, it becomes too difficult to know what’s doing what. Change the rollers and try the bike. If the bike is slow for the fist couple meters when you take off, then you can consider upgrading your spring. Mordeth is right when he explains how the clutch works. That’s why springs are marked with a RPM rating. I’m guessing your bike needs 1500RPM, maybe a little more like 1700RPM.
Springs are more money than rollers so do that first and test drive the bike that way you’ll know the effect each part has on your bike’s performance.
When the rollers wear down, they lose their round shape and they can get stuck behind the pulley. When that happens, it’s like being stuck in high gear, the bike loses all acceleration at low speed. The bike feels broken basically. Easy to tell when the rollers are worn down drastically. At first, you’ll occasionally notice a lack of power when accelerating. As the bearings wear down even more, the symptoms become more frequent.
Hope that helps, let us know how it works for you.