Scag WB black spark plugs

[theguynextdoor]

My Scag 48 inch belt drive WB started to run horribly the other day. It ran funny without the blades engaged and once I engaged the blades, it would barely stay running or shut off. So I pulled the plugs and they were completely black. I went and got some new ones and after 5 residential lawns they were totally black again and the mower would barely run. Any ideas what could be causing the problem or what might need to be replaced/looked at?

Thank you for the help. I need the mower running by Thursday to mow lawns.

[Tharrell]

Here's a website, you can figure out your particular circumstances. Tony
http://www.gnttype.org/techarea/engine/plugs.html

[Dstosh]

For a quick fix, try getting a hotter plug. It seems as if you have deeper issues than that though. See if the hotter plugs can get you through the season. I wouldnt get only 1 or 2 ranges hottter, as to not damage the engine.

[mowerknower]

Mr. Obvious says you should put in a new air filter.

[theguynextdoor]

Mr. Obvious says you should put in a new air filter.

HAHA. I did think of that first, but havn't had a chance to look at it yet because of classes the past few days. I'll take a look at everything tomorrow. Seems like it's burning a little more gas than usual, which would cause the spark plugs to go faster. We'll see. Thanks for the info

[AmsoilPower]

Check to make sure the choke is not sticking on partially. Be sure choke cable works properly and adjusted correctly.