After changing the lawn mower blade on a Yard King with a universal mulcher blade - it doesn't cut the grass as well leaving strands of uncut grass Why is this?

Answer 1

If it is a multi blade unit check to see if the blades are the correct size, otherwise when mulching the machine is cutting and recutting the grass inside the deck, the grass must be cut often and it must be dry. Either of these conditions will cause too much grass to be inside the deck slowing down the mower and lessening its ability to cut. Traction speed must be also slow. You can probably hear rumbling noises in the deck along with the engine slowing down and when you lift the deck up wet grass will spit out.

As a trade for not bagging clippings you will need to slow way down, cut often enough that you are cutting less each time, never cut when the grass is wet.

The first thing i would do is to confirm proper/correct blade installation. If the blade is upside down it will cutwith the back side of the blade (not sharp). With the blade in place and the spark plug disconnected, gentle pull the starter handle with only enough force to cause the blade to turn slightly. Is the blade's sharp edge the leading edge. If not then remove turn the blade over and try it again. I have done this my self when i was in a hurry hope it helps.