I have a 425 with 1270 hours on it that up until Thursday has always run great. I was almost done mowing and it started to act like I was running out of gas. I was able to disengage PTO and lower RPMs and drive to garage. At the time gas tank was less than a 1/4 tank and the fuel filter was maybe 1/4 full. I thought maybe it was low on gas so I filled the tank. I can hear the fuel pump running when I turn the key. I can start like usual but when I increase RPMs it starts to cut run rough and dies. Sometimes this is as soon as I increase the RPMs and sometimes when I engage PTO.
I bought this unit with over 1000 hours and am not sure if the cam gear has been changed.
Where should I start looking?