KMA
Gold Member
I started up the PT422 today (Robin engine) and there was a slight bogging down that happened briefly while idling, but nothing too bad. I parked it for a while and started it up again later in the day. It ran okay, but I thought I could almost hear a dull banging sound over the engine like something large and heavy was loose. I figured I was hearing things... It went away for a minute and then the engine started to shake violently and sputter, with a little bit of black smoke coming out of the muffler. I shut it down immediately. I started it up again with no throttle and it ran, sounding a little bit "off", but as soon as I increase the throttle it starts to shake again.
I didn't want to hurt anything more, so I figured I'd post up here and see what you guys think it could be. The only thing I've done recently was take off the filter and spray some carb cleaner inside. I did that last time I ran it (about a week ago) and mowed for about 2 hours without issue.
Anyone know what this could be?
Thanks for your help.
I didn't want to hurt anything more, so I figured I'd post up here and see what you guys think it could be. The only thing I've done recently was take off the filter and spray some carb cleaner inside. I did that last time I ran it (about a week ago) and mowed for about 2 hours without issue.
Anyone know what this could be?
Thanks for your help.