I've got a (new to me)149 that's in good shape, but has a few issues. It starts easily and idles well at low and medium speed. The problem, after a short run at mowing short grass, getting to a heavier load in leaves and taller grass, it looses power, knocks and acts like it wants to stop. This is at full throttle.
After stopping the deck, it still labors at full throttle and only cleares up after backing off the throttle. When throttling back up, it labors again, even though the deck is not running. once it starts this, it seems to not want to really clear up. Iv'e done this on two seperate evenings.
I was told that a valve is sticking. Does this sound right? I had new fuel, with MMO, but can't run long, unless I let it idle and burn up a tank of gas.
If its a valve sticking, is there an easy fix or a way to test the sticking valve idea?
Btw, i have checked the plug and wire. I haven't had time yet to readjust the carburator (its clean), check the points or pull the head to look for carbon, etc. I really haven't had much time to check it all out yet.
I'm open for ideas. Thanks