Outdoor Power Equipment and Small Engines - MTD Lawn tractor

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mongo1969
10-07-08, 01:49 PM
I have a MTD lawn tractor with Briggs and Stratton 422707-1214-01. I rebuilt the carb on this thing and it wants to run at full speed. I've backed the idle screw out almost all of the way and still full speed. I can put the choke at 3/4 to half and it will idle down and let me change speeds. Is the carb the problem or maybe the linkage somewhere else. Thanks in advance.

30yearTech
10-07-08, 03:06 PM
The problem could be in the linkages, or the governor may need to be adjusted.
mongo1969
10-08-08, 07:11 AM
Thanks 30year for the speedy response!! I just noticed that there is a small amount of gas that spatters up from the intake as well. Before I start tearing apart the linkages and reinstalling should I tear the carb apart one more time to make sure everything is sealed properly? I have never had this much trouble from a carb rebuild.

Thanks

30yearTech
10-08-08, 11:47 AM
A little blow back is not that unusual and could indicate some issues with your valves. Since it does start and run, I would not be concerned about the blow back at this time. I still think the problem is in the linkage hook up to the carburetor or your governor adjustments.