Chainsaw Repair

The ones I have worked on seem to have a lot of torque and do not bog down as much in heavy grass or weeds.
They are a lot heavier then the 2 stroke trimmers and if used for a long time it can be a noticeable difference.
You have to be careful how much oil you run in them because if too full the crank case breather will push the oil into the air filter.    I have also run into some plastic cams on those which did not impress me.   The 2 strokes are easier to work on.

http://wem.walbro.com/distributors/servicemanuals/WYLseries.pdf  diagram of a rotary barrel carburetor.

I read that when I first started working on those carbs.    Some very good information there.