First a back fire took them out. So I replaced them. A month later, my bike starts running like shit then cuts out. I look at the reeds, like sleeper said they were chewed up and one was completely broke. So I called moto tassanari and they said send em in. I called when they got in, told the guy everything, fuel, oil ratio, motor work, and jetting. so he said he'll see if they can warranty it or not. He said it not, they get me a set of vf3 for a good price. So either way I win. But out of no where I have a box with all vf3 written over it in the mail, well they just used the box but mine were awesome. Everything new except the outer cage block thing. And like I said they click in there and stay in place. There a awesome company, and like I said they get my money every time.