2014 TB30R REVS HIGH EVEN IN TURTLE MODE

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Retiredarmy97

Forum Newbie
Just Replaced carb,fuel filter,plug.When starting up it will idle low for 30 seconds then rev high even in turtle mode.Triple checked linkage hooked up correctly.Looked on youtube ,chatgpt.google,etc.but nothing covers a mower that old.Thanks for any help.
 
Retiredarmy97 said:
Just Replaced carb,fuel filter,plug.When starting up it will idle low for 30 seconds then rev high even in turtle mode.Triple checked linkage hooked up correctly.Looked on youtube ,chatgpt.google,etc.but nothing covers a mower that old.Thanks for any help.
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We need more information.

You say it idles for 30 seconds; Is it idling smoothly or rough?

Also, does the rpm speed creep up to high rev slowly, or at 30 seconds it just shoots up immediately to max rev?

Is it a steady rev at max speed or is it an elevated rev above idle?

Is the rev varying from max speed to mid speed?
 
VirginiaIron said:
We need more information.

You say it idles for 30 seconds; Is it idling smoothly or rough?

Also, does the rpm speed creep up to high rev slowly, or at 30 seconds it just shoots up immediately to max rev?

Is it a steady rev at max speed or is it an elevated rev above idle?

Is the rev varying from max speed to mid speed?
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It runs smooth, it'll idle then shoot up to max and stays there. Steady rev at max abs stays there till turned off.
 
I am having some thoughts, but need to know what engine this mower has. Model info from engine will be needed to proceed.
 
I would start by checking for any binding or stickiness in the throttle shaft on the carb, as well as the throttle shaft to governor arm linkage not binding. Could be an issue with the governor gear itself. Have seen that issue before but not on Briggs. Also the governor springs job is to speed up the engine and the governor is to slow down the engine. So I don't think the spring is the issue, I am leaning more toward the governor arm/gear side of the equation.

But wouldn't also hurt to do a static governor adjustment to rule out misadjusted governor arm.
 
ILENGINE said:
I would start by checking for any binding or stickiness in the throttle shaft on the carb, as well as the throttle shaft to governor arm linkage not binding. Could be an issue with the governor gear itself. Have seen that issue before but not on Briggs. Also the governor springs job is to speed up the engine and the governor is to slow down the engine. So I don't think the spring is the issue, I am leaning more toward the governor arm/gear side of the equation.

But wouldn't also hurt to do a static governor adjustment to rule out misadjusted governor arm.
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Checked, no binding on the carb, there's about 1/16th play from the governor arm into the engine.
 
ILENGINE said:
I would start by checking for any binding or stickiness in the throttle shaft on the carb, as well as the throttle shaft to governor arm linkage not binding. Could be an issue with the governor gear itself. Have seen that issue before but not on Briggs. Also the governor springs job is to speed up the engine and the governor is to slow down the engine. So I don't think the spring is the issue, I am leaning more toward the governor arm/gear side of the equation.

But wouldn't also hurt to do a static governor adjustment to rule out misadjusted governor arm.
Click to expand...
I had an engine in the early ‘90’s that ran full throttle and it was due to the failure of the internal plastic governed spool. But it ran wide open at all times, even on startup. The OP says the engine will run at idle [upon startup] for 30 seconds then all of a sudden goes full throttle. Reminds me of the movie where the landing craft operator says “30 seconds” then everything gets crazy.

Can the OP manually lower the throttle (carburetor linkage) with his finger and maintain an idle speed (turtle)?
 
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