6HP B&S hard to keep running (also surges)

[Greggy_D]

This is a 2002 Craftsman mower. Just a month ago, the engine started "surging". You could hear it rev up and down continuously while mowing. Now the darn thing will barely stay running. I changed the plug at the beginning of this year. When I checked the plug yesterday, it was blacker than black with carbon. Also, it seems like I've been using more gas (new gas BTW) than normal during this problem.

Where should I start looking for resolution?

 

[-Clayton-]

Probably just got some trash in the carb, A good cleaning may take care of it.

 

[Bill Kapaun]

"Where should I start looking for resolution?"
By posting engine numbers so we can figure out what carb you have.
It does sound like you are flooding out.
If you have a bowl type carb, clean the needle & seat.
Also examine (smell) the oil to make sure it's not contaminated with fuel.
Any of the Briggs type carbs, make sure the choke is off.

 

[Greggy_D]

OK...I'll have to look for the numbers later today. The carb doesn't have any choke settings or adjustment screws. No throttle speed control either. That I am sure of.

 

[doitmyself]

Check all fuel/air related items.

Check the air filter for clogging and /or oil saturation (air starvation).

Check the governor spring - intact, hooked up, not stretched.

Check the gas tank vent. See if it runs ok without the cap on.

Check the fuel lines (if any) for loose connection/cut.

 

[CaspianM]

I bet it is clogged carb. Very common.
Spray it with carb cleaner from the throtle side and fuel line. Make sure you use fresh high quality gas such as chevron/shell after clean up.

 

[HondaMan]

I bet that if he has pulsi-jet type carb that it is B&S part number 495770.

$3.50

So the big question is: What type of carb?

 

[CaspianM]

What part is that?

 

[Greggy_D]

Quote:

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I bet it is clogged carb. Very common.
Spray it with carb cleaner from the throtle side and fuel line. Make sure you use fresh high quality gas such as chevron/shell after clean up.

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Winner. I sprayed some carb cleaner in there and let it sit for an hour. She's running like new. Thanks to all.