[AT] Lawn tractor

[Cecil Bearden]

I would check the fuel lines and the tank for something that might plug 
the flow of fuel.  Also look at the need and seat and see if something 
is under the seat or if there is a screen in the carburetor between the 
fitting and the seat.  Next I would check the valve lash and set it at a 
couple of thousandths greater than the specs.   What fuel are you 
using.  I only use premium no lead 91 octane.   This might be your only 
problem.   The spark might be weakening also, the condenser may be 
breaking down.
I once worked with a motorcycle trail racer.  His philosophy when a 
machine came in was to immediately rebuild the carb and all ignition 
components.  He said he could rebuild it all before he could do the 
diagnostics on it.   The guy could rebuild a carburetor and the ignition 
in less than 30 minutes.  He won a lot of races....

Cecil in OKla


On 4/18/2016 2:36 PM, Richard Fink Sr wrote:
> This is on and off topic, I have a JD 318 18 hp Onan engine after
> running about 1/2 hour cutting grass it starts to surge engine keeps
> opening throttle up and down. Does not stop running any suggestions
> never had any thing like this before, not sure of year purchased last
> summer late. Next can one of the good computer people give me a link i
> can find the serial number listing for years.
> T hanks
> R Fink Sr
>
> PA
>
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