Pulled the carb off my bike the other day. notice that whoever had it off the last time shimmed the needle with some small washers. the needle has 5 grooves with a clip it it to hold it in place with 2 washers below the clip (holding it higher) and one about the clip (i dont know why) the needle sticks a little with and without these shims. i was curious if maybe this is not the right needle for the carb. anyone have any advice?