Along the lines of smog and lawnmowers, etc, when i purchased my chain saw
(oooh ooohhh oohh a Stihl 029 :-) in california the muffler and carb
adjustments were for California! Lucky for me, it was just another screen
inthe muffler - but i left it there anyways. So the salesman said that as
of 2001 or was it june 2000? all new small engines in CA must have a cat
on them!  WOw, imagine that, a 2000 degree F thing next to something that
ignites at about 300F (your lawn).  As far as chain saws (and weed
whackers, etc) i'm not sure if i'd want to walk around with a saw that is
that hot. i'm nervous enough about the exhaust heat as it is!

Ok, back to cats and lawnmowers :-)
-Matthew
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Matthew Pollard             http://www.uidaho.edu/~poll7356
Dept. of Chemistry               http://www.chem.uidaho.edu
University of Idaho                   http://www.uidaho.edu