Join Date: Nov 2009
Location: georgia's toe-nails of the foot hills
Re: Husqvarna 125B Blower
A long time poster, Red, used to measure string trimmer compression by holding the trimmer by the pull cord handle. If it slowly bip-bip-bip'd to the ground, he said, "Bad. Poor compression." He was using the weight of the engine as the measuring stick.
That said, check for a replacement piston/cylinder. Many are available at pretty low cost compared to the replacement cost of the trimmer. I was able to get a 32cc set for a good price on my WeedEater brand, which would cost a good bit, close to $200 to replace. (When I bought, I was ignorant, and got more than I needed.)
Taking it apart and re-assembly was similar to a puzzle, so if you decide to repair, pay attention to sequence. Maybe take pictures?
A quick search and I get the impression parts would be less than $40...
Added: I had never done any 2-stroke work at all, and it took a bit to figure out how to get the rings compressed. I lubed them(one?) well, and wiggled the rings past the 'cone' area successfully. Learned. IOW, don't be afraid of it, someone was able to put it together successfully before you, so you have a good chance.
simplificate & add lightness
It's not how hard you work, it's how much you get done.