Only problem ive ever had a problem with from them was a adj. timing plate. It stripped with no pressure on the bolts at all... Other then that, I have a RS flywheel on my drag bike, RS stator on my wifes bike, and have not had a problem with them. Its hard not to use them because they have good prices on expensive parts. I am not 100% happy with thier products, but I will buy them again.