Update. Christine, head of (so called) Customer Service at Echo in IL will no longer return my phone calls or emails. And no, I was never crude, rude or abusive. Thanks to Chris R and others here my buddy and I will probably muffler and carb mod our 2 Cs490 and CS400 this weekend and have better saws than out of the box saws. If something goes wrong with them I know our Customer Service will correct the problem. lol Going to keep my eyes open for a good buy on another CS400. Thanks everyone for the help and ideas.