Gang,
I have a Craftsmen LT1000 rider with a 19.5 HP briggs engine. It was running great up until now. It wont rev up to top speed. It will start right up and Idle every time but wont rev up to full power. Its seams like i have a air mixture fuel issue. One thing I did notice that it seams to run fine with out the air cleaner on........ once I put the air cleaner on is when it acts up.so OK I replaced the air cleaner.....same issue. I then assumed it was a carb issue, got a carb kit and rebuilt the carb...same issue, I bought a brand new carb and still have same issue. I then thought maybe cracked manafold.....sprayed starting fluid all around while running to see if engine speed would change and that didn't do any thing. Also I noticed that now I have to close the choke 1/4 of the way to keep it running, it spits and sputters when the top butterfly choke is wide open. Another thing I noticed is the while running, the idle screw adjustment pulsates back and forth. It never did that before. I also replaced the plugs and coil assembly as well. Any ideas what could be going wrong? There is a hose that come from the engine that goes to the bottom of the air cleaner, what does that do? Also there is a vacuum hose from the carb under the fuel pump to the engine
Could something there be my issue?
