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MTD 115/76 Tecumseh 12.5HP OHV Carburettor Issue

Started by JBASport, June 02, 2024, 06:42:00 AM

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JBASport

My MTD 115/76 with a Tecumseh Formula 12.5HP Engine was working ok but then will no longer start. I have changed the inline fuel filter & fuel ssems to be getting to the carburettor ok, but there is no sign of wetting on the spark plug. Reading comments there seems to be an issue with this type of carburettor involving a solenoid. I cannot seem to find any specific information on these carburettors. Should I look to replace it or is there a better alternative to fit? Any help would be much appreciated. Terry

Mick

On the opposite side of the carb to the fuel inlet there is a big screw, behind that screw there will be a small spring holding the plastic main jet in place. I would suggest that main jet is blocked.  That said you should see some fuel coming out just by undoing the screw, if not then either the fuel isn't getting into the bowl, or the bowl is full of debris.

You can disconnect the fuel line and then unclip and remove the bowl, but bear in mind there is a rather complicated gasket which could break, and a plastic emulsion tube also spring loaded being pushed up to the centre of the carb body. Be careful not to break that emulsion tube.
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Mick

OK, found a vid for you, should give you some idea.  Though in your image I couldn't see a over run solenoid, hence why I mentioned the big screw. ;)

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Mick

And another one here, Taryl goes into a bit more detail,

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