MTD Mower

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  #1  
Old 05-27-08, 12:51 PM
crazycory22's Avatar
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MTD Mower

I have an older MTD mower with a 4hp B & S engine. The one with the fuel tank attached to the carb. I'm having some surging problems with it, I bought the thing for $10 it run and mows fine but it surges. The question I'm having is weather or not the throttle linkage is set right. It looks really really loose to me. Here are the links to the pictures I took of the throttle linkage and the model/serial number of the mower. Any help would be greatly appreciated.

http://i94.photobucket.com/albums/l8...5/DSC01532.jpg

http://i94.photobucket.com/albums/l8...5/DSC01535.jpg
 
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  #2  
Old 05-27-08, 01:06 PM
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The large spring looks like it has been streched at the end, however that is not creating the surging problem.
You need to install a new diaphram kit, it is Briggs part # 795083 or old # 495770 also Lowe's has a kit #5083 which has the same parts.

Here we go;
Remove air cleaner, there are 2 bolts that hold things together, one on the front of the tank 3/8" and one into the block 1/2", remove these bolts, now "slowly" slide the carb/tank off the intake tube and breather tube, now tilt the tank in to release the throttle linkage and waalaa the carb/tank is removed. Remove the 5 screws from the carb/tank remove carb(don't loose the spring) now spray all holes, cracks and crevases in both the carb and tank surface with brake parts cleaner, remove the main screen(looks like a thimble) with a small screwdriver pry out the main jet(carefully) and clean it, reinstall the jet, it can be difficult some times to get it to snap back in place(I use the rounded end of a screwdriver handle). Remove and clean the fuel pickup stem. Clean any junk/rust from the tank. Install the diaphram on the tank then the gasket(no goo or sealer) now carefully replace the carb(the spring will try to misalign the diaphram), tighten all screws a little at a time so as not to crimp the diaphram until they are all tight. Install the carb/tank in reverse order and you are done. If I missed something one of the real mechanics will correct me. Have a good one. Geo
 
  #3  
Old 05-27-08, 06:02 PM
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Thanks I'll give that a try in a few weeks, and let you know the results.
 
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