I had the stock muffler on my 26cc 001 and tuned it a little rich as it's still in break-in mode. I ran it around then changed to the tuned pipe (love the sound difference!!). Anyway, I had to really lean it out to get it to run after installing the pipe. Its still about 1 1/16 out so I think its ok but it wanted a lot more with the stock muffler. Is this normal to have to change the tune so much just from a pipe?