[AT] Lawn tractor

[Dennis Johnson]

All,

Some of these engines have valve seats that get loose and then lose sealing with the valve. It is a bit of a pain to find, and not an easy fix. 

Thanks,
Dennis


Sent from my iPad

> On Apr 18, 2016, at 4:31 PM, Cecil Bearden <crbearden at copper.net> wrote:
> 
> 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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