Mower ran great last year. Muffler rotted off past down pipe. Ran 1 time with no exhaust cut greatvjust loud. Fast forward 5 months cranked and ran rough started dieing and only runs (although poorly on full choke) started getting worse and worse would run. I now replaced cheap carb. Coil and spark plug. Runs on full choke only. Can throttle up and down smoothly but when chole is.lowered or turned off it does instantly. Tried 1 and a half turns from full stop o. Carb adjustment. Tried 2 and half turns and everywjere on between best we can get is run but requires full choke! Last todbit, it also wont crank on its on accord regardless of adjustment screw settongs or choke it always needs a small puff of aeresol carb cleaner and then sje runs fine (on full choke)

Is it the lack of backpressure??? It ran fine last year without muffle can...

Did i burn a valve?? Is it simply 6 gallons of bad gas???

Help

I have -the Briggs engine with 590 hours on it. After winter I went to start it up this year, and it wouldn't catch, had to use a ton of starter fluid. But the engine started smoking , when engaging the blades. Plus some small leaking oil. When I turn off the mower, and unscrew the oil cap, there isa  little smoke coming out. I figured the gasket blew. So Took to a reputable local shop near me, and they said noting wrong with gasket at all, the engine was just dirty. But solenoid was bad so they replaced. Starts fine, but there is still some smoke coming out of the engine oil cap when I open it after running. I haven't done a mow yet, just got it back, but did engage the blades.
 
Very confused, how could this not have been a blown head gasket?

I am trying to locate the following: Engine Zone Control Cable #851664
This is for a Sears Craftsman mower 4.0 HP 20" Cut.
According to Sears, the part is no longer available and I have been unable
to find it elsewhere. Is there an equivalent I can use? Can I just measure
and find something with the same dimensions?
Thanks in advance.

Hello,
 
I have a mower that runs pretty poorly in that is runs and stutters. I can see puffs of black smoke from the exhaust every time it stutters. The spark plug goes black with soot, indicating rich running.
 
I have serviced that carburetor with new diaphragm, gasket and cleaned it all with carb cleaner and compressed air.
Twice actually and I also removed the main jet for cleaning.
 
None of made any difference and it runs exactly like before.
 
When looking into the carb, onto the main jet, I can see petrol drops coming out there and flying baout and ever time I see a big drop coming, the splutter follows.
  
Here is a video of this:
(Sorry, it was hard to hold the torch and the camera at the same time with precision)
 
EDIT: This forum does not seem to allow links (perhaps because I am still new). 
Please paste the text below into your browser to get to the video clip.
 
youtube.com/shorts/8uKIvhzcnhk
 
 
I am not not sure what next to do. The carb is clean and apart from some wear in the throttle shaft, I can't find anything wrong with it.
 
Do I need a new carburetor or is this problem caused by something else in the engine perhaps?
 
Best regards
Bernt
 
 

Can anyone explain what this component does ?  I kmow the oil level sensor is inside the crankcase and I assumed it was float switch so why is this extra part needed ? 
 

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