Ok so it's winter and I'm thinking about doing some stuff to the cr 250. For those of you who don't know it's a 2000. I'm thinking about doing a carb rebuilt kit I know it's very cheap to do. The bike doesn't need it because it always starts runs idles has plenty of power but one reason I want to do it is you can see the dirt in the carb when you play with the idle screw but that's just a clean but the real reason I want to do it is the guy I bought it off jetted it for 40:1 and I'm just not 100% comfortable with that it's on the lean side I prefer 32:1. So what I'm asking is it hard to jet my bike to get it right