But the saw just isn't built for hard use or built to last as long (plastic case). And on paper, it lacks power. The saw is built for "ocassional" use.
Well, I am no chainsaw fanatic, but I have taken apart and fixed many of
them.
I have what is left of a "pro" saw here, a Stihl 066, 92 cc unit. The
chassis with integrated oil and fuel tanks and rear handle is all plastic. I
suspect that any newer pro saw is plastic now in these areas. Plastics are
not all bad, but some areas are better made of Al.
Once upon a time, chainsaws were all-aluminum, but weighed a lot. My
old Echo 451VL used plastic only for the air filter cover.
I have noticed these things about the more expensive saws, big or small:
> the forward hoop handle is aluminum, not plastic (e.g. Al handles: Stihl
066, Shindaiwa 377; plastic handles: Stihl 029, MS170, Husky 455,
Makita DCS34)
> the bar spike is steel. Cheaper small saws have either no bar spike, or
it is plastic and part of the plastic chassis. My first small saw with a
steel spike is my Shindaiwa 377
> ever have a chain come off? There is usually a "chain-catcher" under
the clutch cover. The cheapest have none, and a loose chain can
tear up the plastic
> I don't see a pattern with the carbs...the cheapest and most expensive
saws often seem to have Walbro carbs....maybe Walbro makes pro-grade
and consumer-grade carbs? I don't know and can't tell by looking.
Maybe others have more specifics to add to this...
One thing I have discovered about parts: I can get any Stihl or Husky parts
in a few days by mail (so far, anyway). I still await the arrival of my 1st
Makita chainsaw parts order.