good day all i replaced my original 681 a few years back, and while it's a good runner, smoke out put has always been rather poor, my original one smokes great but it's retired, so today i decided to pull my runner apart, the main problem is lack of puffing action, i found no spring on top of the piston, the diagram i found shows this spring as optional, does any body have an idea what spring to use for this?
thanks.
Dave
The spring is 2026-44. I an surprised that your diagram does not give the part number.
You could also have a clogged vent. Or you can have a smoke element with too much resistance. Or the smoke unit could simply have too much smoke material in there. Too much material, and the smoke unit may not get hot enough.
I add that 2026-44 spring to most postwar smoke units.
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