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#940458 - 06/09/18 09:37 PM Honda 5 HP 4-Cycle Engine Problem
Clint_Robbins Offline

Carpal Tunnel

Registered: 09/19/01
Posts: 11308
Loc: Akron, OH
The mower would only run on full choke for some time and then began hardly running at all. I soaked the Kei Hin BE carb in white vinegar and cleaned the passages. It started quickly and runs good on full choke again, but sputters and quits when I move away from the choke position.

The carb has a tube about 5/16" in diameter which extends into the bowl. Inside is a screw which I couldn't get out. What is the screw and should it be removed and cleaned? Does this problem appear to be caused by a dirty carb?

I've never changed any carb settings - is it possible that adjusting the carb settings might correct the problem?

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#940511 - 06/11/18 06:21 AM Re: Honda 5 HP 4-Cycle Engine Problem [Re: Clint_Robbins]
Clint_Robbins Offline

Carpal Tunnel

Registered: 09/19/01
Posts: 11308
Loc: Akron, OH
Bump

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#940513 - 06/11/18 07:46 AM Re: Honda 5 HP 4-Cycle Engine Problem [Re: Clint_Robbins]
CabinConnection Offline
Bigfoot
Carpal Tunnel

Registered: 01/20/04
Posts: 52791
Loc: The Indianhead's Left Nostril....
Pretty sure you have a clogged jet. I'd remove it again and take some aresol carb cleaner and focus the nozzle spray into every oriface you can find.

Replacement carbs are really inexpensive...

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#940527 - 06/11/18 11:33 AM Re: Honda 5 HP 4-Cycle Engine Problem [Re: Clint_Robbins]
JasonB Offline
Sharp -Shooter
Carpal Tunnel

Registered: 04/27/04
Posts: 16812
Loc: Cape Spencer, New Brunswick, C...
Agree with CC. Most carbs today do not include any adjustable
jets (needle valves). If it ran once, and doesn't run well now, something is likely clogged.

When you open a carb, you usually do so by removing a brass bolt at the bottom of the carb bowl. This is generally also the main jet. There is typically a hole in the side of the threads that also feeds the idle jets.

Spray thru the main jet, and up the hole where it installs. Also, look in the throttle (engine) end of the carb's venturi. You'll typically see 3-4 small holes (hair-size) drilled in a group where the throttle butterfly closes against the wall. These are fed from the main jet, via the hole in the side, as mentioned above. You can spray in the hole that feeds them with WD40 or similar, and you should be able to see it come out those transition holes in the venturi. If not, there's a clog in that passage. It'd be accessed by removing the welsh plug in the outside of the carb body, just outside those transition holes.

Believe that's where the trouble would be.

Other possible issues could be a worn throttle shaft (causes air leak), or a poor gasket seal between carb and engine somewhere.

Failing that, as CC observes, replacement carbs are cheaper than you may think today.

J
_________________________
er, somethin'....

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#940609 - 06/13/18 11:38 AM Re: Honda 5 HP 4-Cycle Engine Problem [Re: Clint_Robbins]
notnew2diy Offline
Carpal Tunnel

Registered: 08/18/06
Posts: 4862
Loc: harvard, il.
When you can get it to run, spray WD40 around the carb.
Might find an air leak.

HTH...good luck....notnew....
_________________________
Thanks to all US military veterans.

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