We can offer various torque springs from Malossi. The main thing about adjusting an engine is to find the right combination of torque spring, variator weights and clutch springs. If the drive belt slips, you will have to go for a stiffer torque spring. On the other hand, choosing a spring that is too stiff will also reduce power output. If you have any problems adjusting your scoot, we recommend checking out our online community; nearly all imaginable combinations have already been tested and discussed there.