I'm no mechanic, need help...

R

Retired404

Forum Newbie
Background:
Cub Cadet Z42
Kohler 7000se.
Had issues with the carburetor last fall & stored over winter with the carb disassembled.
This week I replaced the carb, plugs, fuel pump oil & filter.
It fired right up and but smoked a lot initially, but subsided and won’t idle smoothly.

Suggestions?
Thanks
 
Oil level too high? On those engines I think, you park the stick on top of the threads. You don't screw the oil dipstick in to check the level. Double check me on that.

Carb needle and seat need attention? Pressure test the carb. Should hold a max of 7psi.

Do you have good fuel delivery AT the carb?

Do you have spark AT each plug grounded to the engine block?
 
Won't idle smoothly ?
does it rev up then slow down then rev up again in endless cycles , which is called surging
or
Does it miss occasionally ?
Does the exhaust blow smoke, if so what colour ?

Replaced the carb ?
put the old one back together & replaced it ?
Bought a new one & fitted it ?
If it was a new one where did you get it from ?

Why did you take it off in the first place ?
 
From listening to your video the first thing that
came to mind was a blown head gasket. I've
seen them smoke and surge like that before,
but check out what 'Slomo' and 'Bert' say 1st.
Yes, I'm curious why you took off the carb to
begin with. What was the compression on both
cylinders? Plugs fouled from oil or carbon from
over rich mixture? Good Luck and Welcome to
The LMF!
 
DaveTN said:
From listening to your video the first thing that
came to mind was a blown head gasket. I've
seen them smoke and surge like that before,
but check out what 'Slomo' and 'Bert' say 1st.
Yes, I'm curious why you took off the carb to
begin with. What was the compression on both
cylinders? Plugs fouled from oil or carbon from
over rich mixture? Good Luck and Welcome to
The LMF!
Click to expand...
He probably took the carburetor off because everyone often seems to think it’s the carburetor. So the parts changing begins…
 
Just a thought
With carb left off for long period time
Would leave the intake valve less protected maybe rust around seat of the valve ?
 
Retired404 said:
Background:
Cub Cadet Z42
Kohler 7000se.
Had issues with the carburetor last fall & stored over winter with the carb disassembled.
This week I replaced the carb, plugs, fuel pump oil & filter.
It fired right up and but smoked a lot initially, but subsided and won’t idle smoothly.

Suggestions?
Thanks
Click to expand...
In your video, it appears that the engine is not idling, but the throttle is wide open. It also shows in your video that the choke seems to be mostly closed. This sounds like the engine is running too rich and the smoke coming from the engine is because it has too much fuel. Find out why your choke is closed while the engine is running wide-open. This seems to be your problem.
 
Adding to the thought process of ZUE. The Kohler 7000 has the "smart choke" that uses an "air vane" to open up the choke once it starts. You need to pull the shroud and make sure the "air vane" linkage isn't bound up or bent or sticking.

One last note to keep in mind. If you do find something amiss with the air vane and correct it, be sure to put the shroud back on before testing because it must be on for the air vane to operate correctly. Good luck.
 
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