Husqvarna YTH21K46 Engine surges, hunts.

[gbrewer]

I've done all the stuff. New carb gaskets, new exhaust gaskets, new sparkplug, fresh gas, new fuel filter.
Engine starts well, then begins to hunt. Governor lever cycles back and forth. I adjusted the gov setting but problem
continues. Carb has no fuel or other adjustment screws but one on top that doesn't make any changes to engine speed.
I'm open to any and all suggestions. thanks

 

[Douglas Lee]

Can you provide the numbers/ make, model on the engine
How does it run under a load?
Thanks,
Doug Lee
*

 

[Auto Doc's]

If the fuel lines are old and rigid, I recommend you replace them with a quality brand Old line will collapse internally.

Also check the fuel tan outlet nipple for any trash caught in there.

From there the carburetor is suspect.

 

[gbrewer]

It's fixed. Found that the adj. screw for low idle bottom left on rear of carb was MISSING. I had a carb that came in a repair kit; so, I replaced the carb again and all is OK.
Numbers: Husqvarna YTH21K46 Mod. 960450026 01, Ser. 063011A021729. Engine: Kohler SV610 3213 Ser. 4113815753 21H.P.

 

[gbrewer]

Speaking of carburetors; there is a little nylon gromet, bushing, in the governor lever. Some carbs I've ordered have this part, others do not.
I cannot find a part number anywhere for this part. Can anyone offer help? INFO: Kohler SV610 3213 engine.

 

[Auto Doc's]

Hi gbrewer,

That is made to keep excess dust from building up around the top of the shaft. Not all were equipped with them.

Mostly OE had them, and aftermarket just skips putting them on all carburetors.

 

[gbrewer]

I'm talking about the nylon gromet/bushing that the gov. linkage rod attaches to the carb lever.

 

[Auto Doc's]

Is it on the actual carburetor itself or the governor arm? Some carburetors have them and some don't.

 

[gbrewer]

It fits inside the hole in the governor lever ON the carb; then the gov linkage arm fits in the gromet/bushing.

 

[Auto Doc's]

Governor lever is on the engine, and the throttle lever is on the carburetor. You are mixing up the component terminology.