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B&S Pulsajet carb needle doesn't do anything?

I have a B&S 5.5 engine (103000 series) on a splitter that with the air cleaner OFF, starts & runs at max rpm (well I think it's max) for about 30 seconds, then slowly starts to lose rpm's until it stops. I can get it to run longer when I replace the air cleaner. However, I noticed the main jet adjustment has no effect whatsoever. I replaced plug, diaphram, cleaned carb and the breather thoroughly. When I finally get it running the engine doesn't seem to develop the HP as it will often slow considerably when I get into harder wood.

Charlie
January 2007

Garden Tools, Lawn Mowers

Will it start right back up after it dies, or does it have to cool down first?

Rick
January 2007

Thanks Rick, but I cleaned the screen when I removed the carb and made sure it was clear with compressed air. I cleaned the tank of some dirt too. And, I tried to see if the fuel cap was breathing, but I've never seen one like this before. Metal tabs hold it in place with a half-turn. There's no evidence of a pinhole to allow breathing. I tried to run the engine without the fuel cap to see if it made any difference and it did not matter - it still wanted to slow down and quit.

Charlie
January 2007

Remove the carb from the tank, and check for a clogged screen in the bottom of the fuel pick-up tubes.

Rick
January 2007