Oscillating Idle then stall under load. Please help!

D

DC813

Forum Newbie
My Mower:
2010 Toro Briggs 6.75 Recycler Self Propelled
Model: 126T02/0299 B1

What I have done:
New Plug
New Plug Wire
New Gas Line
New Air Filter
Removed Bottom Bowl from Carb (Cleaned everything with Carb Cleaner [bowl, screw, both butterflies])

My problem:

When I start the mower, it fires right up. However, it idles poorly. It revs UP AND down and UP AND down.... When I use it and I go through a thick patch of grass, it stalls. This just recently started happening. I adjusted the throttle spring to raise the RPMs and it still runs like crap, but doesn't stall over thick grass. I don't want to damage the engine having the RPMs so high. Also, if the motor is up to temp and it stalls, its VERY hard to restart and sometimes won't start back up until cool again. SO, having replaced everything I stated and cleaned the carb out, what else could be causing it to run like that? I'm stumped.

Thanks in advance for any help.
 
Hate to say it, but you are going to have to clean the carb again. I would recommend ultrasonicly cleaning it if you can find a shop which does it. If you can't, use a bath style cleaner and follow the directions. After cleaning, install a new float needle and seat. Part number 398188. You must make sure that you install the seat properly and in the right direction. You should also check to see if you have the Autochoke set properly.
 
Rivets said:
Hate to say it, but you are going to have to clean the carb again. I would recommend ultrasonicly cleaning it if you can find a shop which does it. If you can't, use a bath style cleaner and follow the directions. After cleaning, install a new float needle and seat. Part number 398188. You must make sure that you install the seat properly and in the right direction. You should also check to see if you have the Autochoke set properly.
Click to expand...

I pulled the carb again when I got home but this time I took it completely off the engine. I don't have a sonic bath but I did use almost an entire can cleaning it with a tooth brush. When I removed the float and needle, I noticed in 2 different locations (seats I guess?) With pin sized holes. I sprayed both holes out very well. Spray was easily exiting the carb. The large paper gasket that seats against the back of the filter box needs to be replaced (but that ddoesn't matter because it runs poorly with the filter box not even in the mower).

Do you have a complete rebuild kit part#? And a new complete carb replacement # in case the rebuild doesn't go well?

I just don't know what else to do. All repair shops around me are 3weeks backlogged.

Thanks again!
 
With the carb off look at the float needle seat, where the needle fits into. Do you see a green seal in there, a red seal in there, or is it brass? We repair about six of these problems every week. Not expensive about $4.00 plus labor. Let me know what you see and I walk you through it.
 
Rivets said:
With the carb off look at the float needle seat, where the needle fits into. Do you see a green seal in there, a red seal in there, or is it brass? We repair about six of these problems every week. Not expensive about $4.00 plus labor. Let me know what you see and I walk you through it.
Click to expand...

I remember seeing a red ring with a pin hole in it.
 
That is the seat which needs to be replaced, using part number 398188. When you get the kit post back and I'll tell you how to do it. Does your better half chrochet, as a #5 needle will come in handy? Will be back online tomorrow.
 
Rivets said:
That is the seat which needs to be replaced, using part number 398188. When you get the kit post back and I'll tell you how to do it. Does your better half chrochet, as a #5 needle will come in handy? Will be back online tomorrow.
Click to expand...

She does not have a needle but I have a ton of tools and picks. I just ordered a new needle and seat from Amazon for $6. I really hope this is the problem. For whats its worth, while its running, I looked into the carb and could see the fuel going into the carb butterfly. Its going in in large drops and sometimes spits little drops. Not sure how its supposed to look but that's what mine looks like. Thanks again!
 
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