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C-8 Stoped Running Need Help!


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#1 sam s OFFLINE  

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Posted November 03, 2013 - 07:01 PM

I have a 72 c-8 I think super convertible. I got it running last night and it ran great so this morning I put on the brush hog to mow and about 30mins into it just shut off!! I rechecked the timing OK,checked sparkOK,checked compression OK, I have feul getting to the carb but not much on the plug. I rebuilt the carb and cleaned and adjusted veva the service manual. I'm just out of idea's and i'm sick of messing with it. please help!!  


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#2 New.Canadian.DB.Owner ONLINE  

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Posted November 03, 2013 - 07:09 PM

Just a WAG, but I'd say you're sucking air somewhere between the carb & the cylinder.  If you have gas in the carb & not on the plug, it is sucking air from someplace other than the carb.  


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#3 superaben OFFLINE  

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Posted November 03, 2013 - 07:31 PM

Sam, these old Gravelys can be a pain in the tail end if they don't work right, but they are great when they are right. 

 

It sure sound to me like something got into the carburetor.  Do you have a fuel filter installed in the line?

 

Pull the plug at the back of the Zenith carburetor. Do you get a good full bowl of gas drain out?

 

Ben W.


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#4 HDWildBill ONLINE  

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Posted November 03, 2013 - 10:45 PM

Along with Ben's and NCBdbO's comments, when you rebuilt the carburetor did you remove the welch plugs?  Did you check the throttle shaft for wear? 



#5 sam s OFFLINE  

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Posted November 04, 2013 - 09:34 PM

Sam, these old Gravelys can be a pain in the tail end if they don't work right, but they are great when they are right. 

 

It sure sound to me like something got into the carburetor.  Do you have a fuel filter installed in the line?

 

Pull the plug at the back of the Zenith carburetor. Do you get a good full bowl of gas drain out?

 

Ben W.

I don't have a filter on it but the tank is clean and i'm getting good fuel flow out of the carb.



#6 sam s OFFLINE  

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Posted November 04, 2013 - 09:35 PM

Along with Ben's and NCBdbO's comments, when you rebuilt the carburetor did you remove the welch plugs?  Did you check the throttle shaft for wear? 

I did not remove the welch plugs. I throttle shaft has a little play but not much.



#7 HDWildBill ONLINE  

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Posted November 04, 2013 - 10:02 PM

When it has cooled down will it restart and run? 



#8 HowardsMF155 OFFLINE  

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Posted November 04, 2013 - 10:28 PM

A Gravely will run with a wide range of ills, or at least attempt to fire.  Models older than yours tended to have issues with the exhaust valve getting stuck open, but you say compression is Ok.  Gas on the plug means fuel is getting to the cylinder.  I'd pull the air hose just to make sure the carb isn't flooding.  I'd also replace the plug.  I've had even relatively new plugs go bad and give me great trouble because "its a new plug, I can see spark, can't be the plug"!






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