I found an IPL for your PP3640 on the Poulan Pro USA site.Long time no post here - but I just got given a Poulan Pro PP3640 from someone who doesn't need it anymore and was clearing their shed.
Looks like a nice little saw with minimal use. And timely, since some %#$& stole my MS260 and Husky 266 recently. Although I've got a used 372XP coming as my 266 replacement i.e. 'big saw', it's great to have a smaller saw for smaller jobs (firewood, limbing).
I can't find much or anything about the PP3640 via the usual sources (google or youtube) - any good info or tips out there on this saw in addition to the manual (which I have)?