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22hp V-twin STILL surging. Help!

#1

D

Dimeadip

I have a 22hp V-twin in my 5 year old Ariel’s tractor mower. It was surging and needed to be run nearly with the choke on by the end of last summer. I replaced the rubber gaskets around the carb bowl, jets, and fuel pick-up tube. Afterwards, the throttle ran in the right spot, but still surged. So I pulled it all apart and checked the gaskets thinking I may have crimped something when I assembled it. Everything was good. While I was in there, I replaced the intake gaskets after cleaning the heads surface really well. Changed absolutely nothing. Still surging like crazy. Anyone have ideas or experience what I should try next? Any help appreciated.


#2

I

ILENGINE

that type of surge is normally associated with the idle circuit in the carb. Even though the engine runs at full throttle, you are still running on the idle circuit unless the engine is under load. those passages are normally in the area at or in front of the throttle butterfly if you are looking into the engine side of the carb. that is the area this is giving you fits. Assess can be limited in some cases and may require removing welch plugs or covers, or in the case of some newer carbs there is no direct assess.


#3

D

Dimeadip

ILENGINE said:
that type of surge is normally associated with the idle circuit in the carb. Even though the engine runs at full throttle, you are still running on the idle circuit unless the engine is under load. those passages are normally in the area at or in front of the throttle butterfly if you are looking into the engine side of the carb. that is the area this is giving you fits. Assess can be limited in some cases and may require removing welch plugs or covers, or in the case of some newer carbs there is no direct assess.
Click to expand...

Thank you. That would make sense as it ran smoother last year when I engaged the blades. Is there a diagram anywhere that would direct me to the passages you’re talking about? Thank you, again.


#4

I

ILENGINE

Get us the model number off of the engine. Which should be either on the blower housing or on the valve cover without the fuel pump. Then somebody should be able to come up with some sort of diagram to assist you.


#5

Boudreaux In Eunice La.

Boudreaux In Eunice La.

Is it the wide Nikki carb about 4 inches wide with the bowl on the bottom or the smaller Nikki carb ???


#6

D

Dimeadip

It’s a Nikki model 795969. Engine model 407777 type 3185G5.

Bowl is on the bottom. Fuel pickup is white.

Thanks for the help, guys.


#7

Boobala

Boobala

These links may prove helpful....

http://outdoorpowerinfo.com/repairs/briggs_intek_v-twin_carb.asp

https://www.bing.com/videos/search?...43E1F1410E483B2CD2F943E1F&fsscr=0&FORM=VDMCNL

https://www.bing.com/videos/search?q=Nikki+Carburetor+Overhaul+Kit&Form=VQFRVP

https://drive.google.com/file/d/0B6NaqjIxWV1ySkZjTTA5TGltZEE/view


#8

C

cruzenmike

I had this same issue last year with my 24hp Briggs and the issue was resolved after I replaced the two rubber o-rings around the jets in the carb....except I accidentally reversed them the first time I put the carb back together which made it run about the same as before. The jets are actually two different sizes due to the differing length of each intake tube. So unless you are 100% certain that they did not get mixed up, then you might want to check by the number stamped on the jets as to which side they go on. Also, you may have some governor issues. There are 2 or 3 springs on those governors that can stretch/weaken causing surging. Also, you will need to do a static and dynamic governor adjustment. It took a couple of tries to get mine right, but when I finally did, it really purred!!


#9

Boobala

Boobala

cruzenmike said:
I had this same issue last year with my 24hp Briggs and the issue was resolved after I replaced the two rubber o-rings around the jets in the carb....except I accidentally reversed them the first time I put the carb back together which made it run about the same as before. The jets are actually two different sizes due to the differing length of each intake tube. So unless you are 100% certain that they did not get mixed up, then you might want to check by the number stamped on the jets as to which side they go on. Also, you may have some governor issues. There are 2 or 3 springs on those governors that can stretch/weaken causing surging. Also, you will need to do a static and dynamic governor adjustment. It took a couple of tries to get mine right, but when I finally did, it really purred!!
Click to expand...

HEY Mike, What model is the 24 HP Briggs of yours ???? ..Is it a ( 44 ? 877 ) series ???


#10

C

cruzenmike

Boobala said:
HEY Mike, What model is the 24 HP Briggs of yours ???? ..Is it a ( 44 ? 877 ) series ???
Click to expand...

It was a 44M777 ELS engine. The Briggs service manual you linked me in my op helped me through everything. In the fall I finally sold the Cub Cadet that it was in, but the repairs/adjustments I made worked.


#11

Boobala

Boobala

cruzenmike said:
It was a 44M777 ELS engine. The Briggs service manual you linked me in my op helped me through everything. In the fall I finally sold the Cub Cadet that it was in, but the repairs/adjustments I made worked.
Click to expand...

Thanks Mike, appreciate your response,....... Boobala


#12

Boudreaux In Eunice La.

Boudreaux In Eunice La.

Dime a dip you still with us ??


#13

H

horsesoldier03

I take good care of my carbs, emptying gas in winter and using premium gas. Engine recently started surging. My issue was that I found a heavy build up of oil on the right valve cover where the vacuum hose for the fuel pump is. After checking the vacuum hose I found it was cracked. The mower is only 3 years old, so I would say if you havent replaced this part, it is an $8 part on amazon and you get two of them. It fixed mine, so you might give it a try.


#14

S

slomo

Surging is caused by a rich or lean mixture. Read your spark plug for more clues.

Check for vacuum leaks by spraying carb spray around the carb mount and intake manifold gasket area. It if smooths out you have a leak.

Might have some jacked up carb linkages.

slomo


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