Lo Boy dies under load

Captain Twining · Sep 13, 2010

My venerable cub lo boy has started stalling out when the mower deck is engaged. Just replaced points and condensor with electronic ignition and timing is fine. The motor runs and starts well until a load is put on it.

Janicholson · Sep 13, 2010

Fuel delivery to carb, or crud in the main jet. If there is solid continuous flow to the carb, I would clean all passages in the carb (submerging it is carb cleaner is best) then blowing out all passages.
if the flow is anemic, clean every passage from the tank pickup tube, to the screen at the carb fitting.
A leaky manifold can also mimic this problem, but is less likely. Jim

79redcub · Sep 14, 2010

On my cub i had the same problem. When you ajust the carb it doesn't help it at all. So the only thing that would work is pulling the chock out as the load comes on. I even put a new carb (zenith) instead of the IH carb had the same problem.

ste_fano · Sep 14, 2010

Almost same problem with mine, 67 lo boy. Had junk right before the carb, in the screen. Cleaned it out, was fine. Great ideas by other people on here too.

Janicholson · Sep 14, 2010

I understand your technique, but believe it is either a intake air leak, or a carburetor problem. IH would not provide equipment that required the operator to use the choke to proceed down the field. If the main jet was designed for high altitude operation (possible) the jet just needs to be changed as needed to richen the mixture. Jim

79redcub · Sep 14, 2010

once u move just a little bit it would be able to push it back in

stkmantn · Sep 14, 2010

On my cub it was the carb gasket broken and sucking air.

Lo Boy dies under load

Captain Twining

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Janicholson

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79redcub

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ste_fano

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Janicholson

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79redcub

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stkmantn

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