Rottmansales has awesome IPL of all the P saws.
Here is a video of my P41S that I put the 6 port 72cc top end on. I have run this saw a fair amount as a 72cc and had to do extensive opening up of the HS147D carb to get it to feed enough fuel. It would not go to rich when I started running it, even at 2 turns LS needle and 3 turns HS , it wasn't getting enough fuel, by both spark plug color and looking in the exhaust outlet to see the color. I held off on opening up the base to feed the boost ports because if it wasn't getting enough fuel with the 4 ports, no sense opening up the boost ports.
It is now running very strong and rich at just over 1 1/4 on both needles. By both the sparkplug color and the muffler baffle color. I have also enlarged the venturi from 14.5 mm to 18mm on this HS147D carb.
This run is with the boost port feed conservatively cut into the flywheel side of the base to feed the additional 2 ports. I did the same thing, P61 Western, did on his P42 when he updated it with a 6 port top end. The base halves that have the cast in feed is much larger than what can be cut into a standard base. This is a P45 top end that I used. The wood being cut in this video is frozen Beech, it is harder than red oak and nearly as hard as white oak. American beech is a great firewood. The stick is 15 to 16" across and has a half inch of ice on the top and left side as you see it in the video. 20" bar with 72 dl 72exl chain, rakers are filed agresive.
I found P61 Western's work by doing a Google search.
That''s correct I am only a 3 month member here. Lol
Remember Lavoy!!!!
Ken
