ilikeurtractor
ArboristSite Lurker
This should have an obvious answer but after searching I can't really find anything on it. Why are older (pre-80's usually) saws so slow, at least the larger displacement ones (>70 cc)? What is limiting their speed? Is it carburetor design that inherently limited air flow? Points start "floating" at higher speeds (?) I know some saws like the McCulloch Super 44A and some of the Stihl saws had methods of limiting speed like activating the choke or restricting the throttle but I don't see that on all saws. I read where the McCulloch BP-1 had some sort of governor because it could potentially over-speed and cause problems and this is claimed to happen because of its exceptional balance but newer saws can outrev the BP-1 (I would think) and they don't have balanced pistons. I'm not necessarily looking to speed up old saws as I realize they weren't designed to go faster than they do, but I'm puzzled as to what is holding them back.