You have to be very careful richening the cat because the excess can plug the muffler and raise the temp too high. Husqvarna has extra precautions on saws with cat mufflers regarding regular maintenance and tuning. They advise that the cooling system must be checked daily on saws with catalytic mufflers. Also, on the 359 the max rpm is 13500 on non cat saws and 13000 on cat equipped saws. They also have a separate section(357xp,359) on carburetor adjustment of cataytic converter equipped saws. These two issues alone illustrate Husqvarna's concern of the issue of the extra heat generated by the cat muffler. The problem is, the saws are fairly lean to begin with so who wouldn't want to richen the mixture?
thanks for the great input yo. muchley appreciated. i mainly get alot of stihls to work on in my shop and only have worked on a few E-techs husqys. i have a 359 etech that was given to me as a trade to work on a few saws and noticed it runs way different then my non EPA e-tech husqy.
MS192T 14" stock
MS192T 14" muffler mod
MS261 18" muffler mod
MS441 25" muffler mod
394XP 32" - 36" muffler mod
P3314 muffler mod(new hire groundy saw)
Mculloch mac 140
when i bought my 359 it had the cat muffler on it and i bought a new 357 muffler and sent it to get modded and then adjusted my saw according and it runs much better, seems snappier and had a little more grunt to it, and sounds much better to. been running like that for 4 years now,
Husky 359, J-Red 2186, Woodmaster 4400
I have a Dolmar 5105 and I removed the cat from the muffler. About 1/2 hour with a screwdriver busting up the honeycomb. Muffler runs much cooler now. I cut the trim tabs on the carb and now can run a richer mixture without issues.
A cat will run very hot if the saw is running rich. Those people who cut the trim tabs off on cat saws better be careful not to burn something up.
McCulloch SP125C, 125/101B x 4, 7-10, Super 44A, 10-10, 795, 890, 797 Super, 895, 797G
Homelite 360, 450, 550, 650 super, 750, Super EZ, XL922, XL923, XP 1020 x 2, XL102, 1050 Super, 2100 x 3, 1130G, 102 Automatic
Pioneer P60, P42, P41 x 2, P50
Solo 680, 635, 603, 655AV, 694
Husqvarna 395XP, 2100CD, 372XPW
Jonsered 2094c, 111S
Dolmar 5105, 166
Stihl 021, 090G, 075, Lightning, Contra S, 090
Alpina Pro 120 X 2
and a few more kicking around......
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