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Mower Only Runs Well On Choke (Lopey Idle) #4692677
03/12/18 04:30 PM
03/12/18 04:30 PM
Joined: Jan 2009
Posts: 6,521
New England
gathermewool Online content OP
gathermewool  Online Content OP
Joined: Jan 2009
Posts: 6,521
New England
Having issues with a very lopey/rough-running mower. Looking for some help.

Mower:
Cub Cadet CC550

Issue:
Before the tear-down, the mower only ran on choke. Even after it was warmed up, it would stall almost immediately when the choke was released.

Maintenance:
1. Drained all fuel
2. Cleaned carb (looked pretty good)
3. Replaced fuel and air filters
4. Replaced spark plug
5. Replaced gasket
6. Added Berryman's B12
7. Added fresh fuel (just purchased today)

Result:
Now, it stalled when the choke was released, until warmed up. When warmed-up, it will run off-choke, but it's VERY lopey. See video below

Previous thread: New To Me Cub Cadet CC550 - Maintenance Tips

Video:


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter (64,774 miles)
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Edge 0W-20 + FU filter (40,803 miles)
Re: Mower Only Runs Well On Choke (Lopey Idle) [Re: gathermewool] #4692683
03/12/18 04:40 PM
03/12/18 04:40 PM
Joined: Mar 2009
Posts: 2,679
Cedarbrae, Ontario
xxch4osxx Online content
xxch4osxx  Online Content
Joined: Mar 2009
Posts: 2,679
Cedarbrae, Ontario
If it only runs with the choke on, its running lean. You might have to look really close at the carb and make sure all the fuel passageways are clear. One tiny piece of dirt is all it takes.

Last edited by xxch4osxx; 03/12/18 04:42 PM.

2015 RAM SXT Crew Cab 5.7 with 6 speed tranny.

2008 Mazda 3 GS Sport Hatchback 5sp MT (Girlfriend's car)

Re: Mower Only Runs Well On Choke (Lopey Idle) [Re: gathermewool] #4692685
03/12/18 04:41 PM
03/12/18 04:41 PM
Joined: Mar 2013
Posts: 124
Iowa
iahawk Offline
iahawk  Offline
Joined: Mar 2013
Posts: 124
Iowa
clean, clean and reclean the carb until it runs well..sometimes it takes a few tries to get it right. Others may suggest saving the trouble and buying a cheap replacement carb..

Re: Mower Only Runs Well On Choke (Lopey Idle) [Re: gathermewool] #4692690
03/12/18 04:44 PM
03/12/18 04:44 PM
Joined: Jan 2009
Posts: 6,521
New England
gathermewool Online content OP
gathermewool  Online Content OP
Joined: Jan 2009
Posts: 6,521
New England
I actually did purchase a rebuild kit AND a new carb. The new carb was the wrong one, so it can't be used.

I now have a carb cleaning brush kit. So, even though it looked clean, I'm going to pull it apart and run brushes through every orifice to see if that fixes it.


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter (64,774 miles)
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Edge 0W-20 + FU filter (40,803 miles)
Re: Mower Only Runs Well On Choke (Lopey Idle) [Re: gathermewool] #4692693
03/12/18 04:47 PM
03/12/18 04:47 PM
Joined: Aug 2010
Posts: 5,940
Champlain/Hudson Valley
Kira Offline
Kira  Offline
Joined: Aug 2010
Posts: 5,940
Champlain/Hudson Valley
My friend completely disassembles little carbs and ALWAYS finds a crumb of yellowed plastic.
He claims it's always a chunk of tubing eaten away by ethanol.

His small engine gig is what he does well. People love him for it.

Re: Mower Only Runs Well On Choke (Lopey Idle) [Re: gathermewool] #4692697
03/12/18 04:51 PM
03/12/18 04:51 PM
Joined: Jan 2009
Posts: 6,521
New England
gathermewool Online content OP
gathermewool  Online Content OP
Joined: Jan 2009
Posts: 6,521
New England
Interesting. It could be that I inadvertently introduced something during reassembly.

I'll pull it apart again soon and see what I find.


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter (64,774 miles)
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Edge 0W-20 + FU filter (40,803 miles)
Re: Mower Only Runs Well On Choke (Lopey Idle) [Re: gathermewool] #4692719
03/12/18 05:12 PM
03/12/18 05:12 PM
Joined: Nov 2006
Posts: 20,574
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,574
MA, Mittelfranken.de
Take the carb apart and thow it in parts cleaner. Brushes are fine but a strand of thin copper wire works well for poking around in tiny passages.
Once its out of an overnight soak blow every passage out with compressed air from both directions if possible.

https://shop.advanceautoparts.com/p/gunk-carburetor-parts-cleaner-complete-kit-cc3k/7040709-P


ASE L1, Master. Deutsch Meisterbrief.
Re: Mower Only Runs Well On Choke (Lopey Idle) [Re: gathermewool] #4692742
03/12/18 05:36 PM
03/12/18 05:36 PM
Joined: Sep 2004
Posts: 7,814
Marshfield , MA
andyd Online content
andyd  Online Content
Joined: Sep 2004
Posts: 7,814
Marshfield , MA
If it starts and runs and eventually runs even lopy without the choke, the I advise to keep dosing the gas with B 12. I've had B 12 fail to help immediately, I resolved to tear down the carb the following week end. Saturday came, and I gave it one last pull on the way to the bench. It lit first pull. grin2


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: Mower Only Runs Well On Choke (Lopey Idle) [Re: gathermewool] #4692748
03/12/18 05:39 PM
03/12/18 05:39 PM
Joined: Jan 2018
Posts: 538
San Antonio, TX
das_peikko Offline
das_peikko  Offline
Joined: Jan 2018
Posts: 538
San Antonio, TX
The engine runs better with the choke partly on BECAUSE it's getting too much air with the choke all the way off. This is the classic dead giveaway sign of a fuel delivery problem. People on this forum always tell you to clean the carburetor but they don't tell you WHY.

Re: Mower Only Runs Well On Choke (Lopey Idle) [Re: das_peikko] #4692760
03/12/18 05:46 PM
03/12/18 05:46 PM
Joined: Aug 2013
Posts: 2,657
Central Maryland
HangFire Offline
HangFire  Offline
Joined: Aug 2013
Posts: 2,657
Central Maryland
Originally Posted By: das_peikko
The engine runs better with the choke partly on BECAUSE it's getting too much air with the choke all the way off. This is the classic dead giveaway sign of a fuel delivery problem. People on this forum always tell you to clean the carburetor but they don't tell you WHY.


xxch4osxx explained why.


Various musings: http://hangfire.net
Re: Mower Only Runs Well On Choke (Lopey Idle) [Re: gathermewool] #4692761
03/12/18 05:46 PM
03/12/18 05:46 PM
Joined: May 2010
Posts: 9,466
out there
spasm3 Online content
spasm3  Online Content
Joined: May 2010
Posts: 9,466
out there
You can try letting it set overnight after it runs with some berryman b-12 in the fuel. If it still runs the same, you will need to take the carb apart and clean it. Lots of jets and venturi holes in some. I had the same issue with a generator that sat for 3 years. I use small .014 stylets to clean the various jets and ports.


13 elantra 72k 5w30 QSUD
03 chevy avalanche 80k synpwr 5w30
17 mazda cx-5 7300 miles m1 0w30
Re: Mower Only Runs Well On Choke (Lopey Idle) [Re: das_peikko] #4692764
03/12/18 05:48 PM
03/12/18 05:48 PM
Joined: Nov 2006
Posts: 20,574
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,574
MA, Mittelfranken.de
The post by xxch4osxx told him why, no further elaboration needed.


ASE L1, Master. Deutsch Meisterbrief.
Re: Mower Only Runs Well On Choke (Lopey Idle) [Re: gathermewool] #4692772
03/12/18 05:54 PM
03/12/18 05:54 PM
Joined: Apr 2009
Posts: 2,933
Canada
boraticus Offline
boraticus  Offline
Joined: Apr 2009
Posts: 2,933
Canada
Thin wire in every jet, hole and gallery followed up with compressed air.

Do that and the carb will run fine provided you got the wire through all of the above.

Re: Mower Only Runs Well On Choke (Lopey Idle) [Re: HangFire] #4692789
03/12/18 06:01 PM
03/12/18 06:01 PM
Joined: Jan 2018
Posts: 538
San Antonio, TX
das_peikko Offline
das_peikko  Offline
Joined: Jan 2018
Posts: 538
San Antonio, TX
Originally Posted By: HangFire
xxch4osxx explained why.


I read the post. He didn't say WHY the engine was running lean with the choke off.

It's because the engine is getting too much air for the amount of available fuel at the present time.

Re: Mower Only Runs Well On Choke (Lopey Idle) [Re: boraticus] #4692793
03/12/18 06:03 PM
03/12/18 06:03 PM
Joined: May 2010
Posts: 9,466
out there
spasm3 Online content
spasm3  Online Content
Joined: May 2010
Posts: 9,466
out there
Originally Posted By: boraticus
Thin wire in every jet, hole and gallery followed up with compressed air.

Do that and the carb will run fine provided you got the wire through all of the above.


This, actually followed up with carb cleaner spray then compressed air.


13 elantra 72k 5w30 QSUD
03 chevy avalanche 80k synpwr 5w30
17 mazda cx-5 7300 miles m1 0w30
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