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Garden Tractors Discussion Board

Re: Tecumseh carbs

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Posted by joe csuti on August 19, 2012 at 13:37:14 from (

In Reply to: Tecumseh carbs posted by Patrick in Illinois on August 18, 2012 at 19:50:04:

If the eng on the mf8 is a tecumseh hh80 with a walbro carb & the problem you're having is you can't adj idle with needle or eng surgeing with/without load there are two probable causes for these problems.

1-idle passage(s)in carb plugged/restricted as trk said.

2-if you removed main jet brass nozzle from carb body,idle supply hole in nozzle plugged or not lined up with idle supply passage,goto link below,if nozzle looks like nozzle on right,get a new service nozzle.If main jet nozzle looks like one on right in pic,look very carefully at threads,you will see a tiny hole drilled thru threads into center of nozzle,this hole is located within taper range of hi-speed needle & supplies gas to low speed/idle passages in carb,if you look at main jet casting you'll see a ridge on one side of casting & same will probably have a small brass plug on bottom corner,when carb built main jet nozzle screwed into carb body,then a small drill is inserted into hole in ridge & a hole is drilled thru threads in nozzle body,after hole drilled a brass plug is pressed into hole in ridge,if hole in threads doesn't line up with hole in casting when nozzle re-installed you will get no or little gas to idle circuit.

There are 3-4 different service nozzles for carb,you will need eng mod/spec# & tecumseh pn for carb to have local dealer lookup/order nozzle,same are gettig a little hard to come by & somewhat expensive,$12-$15 depending on pn of carb.


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