I just bought the Alba K&N/adapter kit. The Z was of course running crappy after drilling out the pea shooter and putting on the Alba kit. The reason for this post is to tell you all how frustrated I was when trying to unscrew the screws at the bottom of the carb. They were basically putty. All the heads of the screws got damaged. I ended up taking the whole carb off the quad, replacing the cheap Mikuni screws and replacing them with nice, larger head, stainless screws. Now I have to re-install the carb. I'm at sea-level, how does a 145 main sound?