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GT5000 Kohler engine acting weird


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#1 rover OFFLINE  

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Posted January 09, 2018 - 02:43 PM

New guy, 

I upgraded my computer and have hi-speed internet, these repair forums are great. I couldn't download information before on a 97 laptop and dial-up. I also appreciate these forums, lots of good information.

I searched thru the posts, but didn't find my problem.

I have a 2006 GT-5000 with a Kohler engine  CV730-0044

When starting the engine, throttle is midway, 1/2 choke is applied and engine pops right off.  If the choke is pushed back to open, the engine dies.  If I keep the choke between 1/2 and 3/4, the engine will stay running. (very variable)

Sounds like it needs more gas, right.

Checked fuel line-ok

Checked impulse pump-ok

Cleaned carb, cleared jets, new float and needle (actually carb was very clean)

Fuel Shut-off solenoid worked

new carb intake gaskets-torqued to 10 ft lbs

Checked cylinders for blown head gasket-160psi

Possible cause would be carb pump, but everything look good when disassembled

Governor wasn't messed with

 

Any suggestions?

 

Thanks

 

 



#2 KennyP ONLINE  

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Posted January 09, 2018 - 06:22 PM

:wave:  Welcome to the forum!

Possibly a partially blocked fuel line? Something in the tank? How about the fuel pump sucking fuel into the crankcase? Try smelling the dipstick for gas.



#3 rover OFFLINE  

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Posted January 09, 2018 - 07:22 PM

Kenny, thanks for the comments,

fuel line clear. pulse pump works fine

no fuel smell in oil

 

As I think about this, maybe I need to look at the slow air bleed jets, maybe I missed something.

Thanks


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#4 1oldbuzz OFFLINE  

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Posted January 10, 2018 - 02:55 AM

2006

I assume it has an integrated choke/throttle

theres the problem

position will change with the weather

 

I never cared for that system

no engine should fire at full throttle



#5 KennyP ONLINE  

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Posted January 10, 2018 - 05:20 AM

2006

I assume it has an integrated choke/throttle

theres the problem

position will change with the weather

 

I never cared for that system

no engine should fire at full throttle

On the 2 CV730's I have the choke is separate from the throttle.

I haven't had this type issue with mine, so not sure what could be the problem. It's gotta be in the carb.



#6 rover OFFLINE  

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Posted January 10, 2018 - 09:11 AM

1oldbuzz, no choke and throttle are separate.

Kenny, the problem has to be the carb.  It was running great before hand.  Something came into the carb, either thru the air cleaner or the gas line.  Will have to check these passage ways very carefully.  The pump on the side of carb looks fine, rubber pliable.

I hope I can find the problem as a new carb is $360.00!

 

Will post my progress as I go.


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#7 KennyP ONLINE  

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Posted January 10, 2018 - 09:17 AM

Yours has the fuel pump on the carb? Both of mine have the pump mounted to the side of the engine. Like this:

 

https://screenshots....w.partstree.com



#8 WNYTractorTinkerer OFFLINE  

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Posted January 10, 2018 - 09:34 AM

Is the float level set right?  If the fuel level in the bowl is too high that would explain your trouble..



#9 rover OFFLINE  

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Posted January 10, 2018 - 09:39 AM

KennyP,

Pulse pump mounted on engine.

There is a round mount on opposite side of gas supply hose of carb. It is attached to the bowl. The bowl bleeds into this "pump"thru a rubber pad that must open due to vacuum.  One line travels to just below choke and other line to air bleeders on top of carb.  Both lines appear to be open, but I'm re-checking the again.


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#10 rover OFFLINE  

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Posted January 10, 2018 - 09:42 AM

WNY

The float is not adjustable.

New float, oem part, one piece plastic float and stop tang


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#11 KennyP ONLINE  

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Posted January 10, 2018 - 09:51 AM

KennyP,

Pulse pump mounted on engine.

There is a round mount on opposite side of gas supply hose of carb. It is attached to the bowl. The bowl bleeds into this "pump"thru a rubber pad that must open due to vacuum.  One line travels to just below choke and other line to air bleeders on top of carb.  Both lines appear to be open, but I'm re-checking the again.

I'd have to go out and look at mine to see what you are talking about. Anyway to post some pics?



#12 crittersf1 OFFLINE  

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Posted January 10, 2018 - 10:12 AM

Vacuum leak?


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#13 WNYTractorTinkerer OFFLINE  

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Posted January 10, 2018 - 10:44 AM

https://www.google.c...I9gN-DTHNJt0JI2


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#14 rover OFFLINE  

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Posted January 10, 2018 - 01:08 PM

s-l1600.jpg

 

This is a picture of the carb  24-053-102  from e-bay

 

 

Critter

vacuum leak possible, but from where?   Gaskets are new on both ends of carb.  I torque them to 10 ft lbs.

 

 

WNY

I have been studying the fuel system part of that manual for a couple days.  The carb diagrams do not show my carb.

There are no adjustments on this carb if you exclude the idle set screw.  That has not been changed.

 

Dis-assembled carb, took extra care in cleaning all port holes, removed 2 jets, look good, dis-assembled  that "pump"

on the side-looks good.  Every hole in the carb allows air movement.  Will put it back on engine today.  Will post either way.


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#15 rover OFFLINE  

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Posted January 11, 2018 - 12:32 PM

Well, cleaned carb  again especially checking the low speed circuit route.  Pulled main jet and bleeder air jet, everything clear.

Re-checked solenoid, moves up and down multiple times.  Checked intake manifold-no cracks-gaskets good,  pulse pump pumps lots of gas.

So starting tractor cold with throttle 1/2 open and choke 1/2 closed, engine starts after third cycle.  Full throttle and almost full choke,

engine runs like it should.  Push choke in and engine stalls.  1/2 throttle with 1/2 choke, engine runs fine.  Push coke in and engine stalls.  No backfires, just dies.  Pulled spark plugs and plug ends are not black.

 

Thanks everyone for your suggestions.






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