It is a 45cc consumer grade saw, great for the occasional user and weekend warrior but not robust or powerful enough for the serious cutter. It works best with a 16" bar, 18 if the chain is kept properly sharpened and the saw is allowed to do the work. 20" is available but I don't recommend it. I read your other post, you need a lot more than an 025 to run that 25" bar. Look for at least an 038 or a Husqvarna 365. A good one will fetch a fair dollar, do you have enough work to justify it?