I got a new Hitachi CS51EAP 50.1cc chainsaw and found a muffler fill of catalytic converter, I have never had a 2 cycle or any other small engine with a cat, can anyone share their experiences with this emission control on 2 strokes? After testing it I am impressed with the lack of smoke when using a 40:1 mix. Will running this mix be OK since it is a 50:1 engine but the manual says mixes up to 25:1 are acceptable. I got this what I think is a good price of $160 delivered and want to help it last.