Chainsaw Repair

I remember around 1990 for the 930 Jonsered you could buy a heated carb kit from Jonsered,consisting of a generator that installed under the flywheel and a heated pad that mounted in front or the carb,but was too expensive and most "Jonny-reds" weren't known to ice up the carbs,they generally ran ok in cold weather without any mods, of course they did have the typical little window in the top cover you could open to suck some warm air from the cylinder.
I've never seen the 044 muffler heat you mentioned,but I once saw an ingenious heated handlebar a guy installed on an old 051. He attached a small copper tube to the muffler which went in one end of his full wrap handlebar and blew right thru and came out the other end,it actually worked very well and he had a small 1/4 turn brass valve in the line so he could adjust how much heat went thru the handlebar,I was impressed! So simple yet it worked well,and didn't cost a couple hundred dollars,just about $10 of parts..I think a guy could build something simple like that at home for one of his own modern saws on that principle...