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730 gas w/ hiccups

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Bill in Ia.

07-18-2008 09:46:43

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I recently bought a 730 w/ a gas engine. If I open the throttle too quickly w/o letting it warm up, it will hiccup and spit oil out of the air cleaner. The tractor has less than 900 hrs. on a complete overhaul. Is it possible the intake valves are not adjusted properly?

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07-19-2008 02:36:14

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 Re: 730 gas w/ hiccups in reply to Bill in Ia., 07-18-2008 09:46:43  
Pat it on the back

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Jim Guarino, Agri-Service

07-18-2008 19:06:42

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 Re: 730 gas w/ hiccups in reply to Bill in Ia., 07-18-2008 09:46:43  
Regardless of what brand tractor this may be, I would say that since the problem happens only when cold, that the carburetor mixture is too lean. The lean mixture does not burn properly, and the incoming air/fuel charge is ignited as soon as the intake valve opens on the next intake stroke. If the valve lash was too tight, the problem would be worse when the engine was hot. As a test, if the mixture is too lean, the problem will go away with a partial choke application. Other possible problems: the timing is not set correctly, the distributor shaft bushings are worn, bad condenser, bad coil.

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