Chainsaw Repair

I had an old Homelite 150XL from 1975 until 1997 and I don't remember ever having to adjust the needles.

I have Husqvarna 357XP and every time I get it out I have to go through the ritual of setting the needles.

A few weeks ago I got out my Stihl 026 PRO which has been ported and muffler modded and had to fiddle with the needles to get them reset and balanced out from being extremely rich. The last time I run it the temperature was about the same but it had Klotz oil before and now has Pennzoil so that was probably it.

I ran a 371XP several times since the snow melted and didn't have to change the needle valves but it is stock.

I have a couple of AT saws and they don't have needle valves.