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1010 Does Carb Venturi need replacement???

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Duane

12-04-1999 04:37:39




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My 1010 would only run with choke fully out. I've checked out and cleaned the carb and put in new gaskets and it did run better but still not right. Everything looks fine but is it possible that the venturi tube is worn and gotten loose and causing air to bypass? I wouldn't have even suspected this except that my old 1957 Gravely with a similar carb recently got diagnosed with this problem. It seems to run ok till I give it gas and then it coughs and runs rough till I pull out the choke. I also have the main jet screwed out all the way. Anyone have experience with this problem on a 1010 with a Marvel-Schevel carb? Thanks for advice.

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Ray

11-01-2001 13:00:39




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 Re: 1010 Does Carb Venturi need replacement??? in reply to Duane, 12-04-1999 04:37:39  
I have a 1010 and had the same problem. Found out that my mechanical advance weights in distrubtor were stuck and spring rusted away. Had alot of problems with engine back firing through carb and blowing oil out of air intake. Was able to make new spring and everything working great.



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RonMC

12-13-1999 18:04:27




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 Re: 1010 Does Carb Venturi need replacement??? in reply to Duane, 12-04-1999 04:37:39  
Hi - it sounds to me like you may still have a small fuel passage plugged up - have you poked around in all the passages ? If not that, then your spark is breaking down somewhere, possibly the cap or rotor. When you pull the choke, you richen the mixture, making it easier for the spark to jump the plug gap, when it's lean, the spark will try to find the path of least resistance, which can be almost anywhere in the secondary system.

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Paul

12-08-1999 05:34:12




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 Re: 1010 Does Carb Venturi need replacement??? in reply to Duane, 12-04-1999 04:37:39  
Duane, does your tractor have a thermostat? My 630 had exactly the same symptoms - would not take a fast throttle advance without the choke being pulled out a little. After cleaning the fuel system several times, I installed a thermostat and the problem ended immediately. This was an accidental cure - I bought the tractor used and the previous owner must have removed the thermostat. During the repair of a broken muffler mount (another sad story) I discovered the lack of a thermostat. The engine was not getting up to operating temperature without the thermostat. Now it only needs choke during the warm-up. Paul

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Duane

12-08-1999 18:16:52




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 Re: Re: 1010 Does Carb Venturi need replacement??? in reply to Paul, 12-08-1999 05:34:12  
I did put a new thermostat in mine and based on temperature gage it comes up to normal operating temp and the problem still persists. However, thanks for your input. Next time I run it I will pay attention to the temperature to see if it does have an effect.



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Walter M

12-05-1999 20:16:37




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 Re: 1010 Does Carb Venturi need replacement??? in reply to Duane, 12-04-1999 04:37:39  
It can't cost that much to replace the venturi,so why not try one? If that dosen't cure the poblem, try a jumper wire from the battery to the ign. side of the coil. If this helps, replace the pink resistor wire from ign. switch to coil, and maybe the coil. Pulling the choke slows the rate of acceleration giving more time for fire to build. Fire "breaking down" can sometimes cause confusing symptons. You may have a different type resistor, but I think the resistor wire was the latest revision.

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Duane

12-06-1999 18:42:25




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 Re: Re: 1010 Does Carb Venturi need replacement??? in reply to Walter M, 12-05-1999 20:16:37  
Yes I should probably just replace the venturi. I'm confused about this fire "breaking down" and the pink resistor wire. When I got this tractor the wiring was all shot, so I rewired it and replaced the gnerator with an alternator and took off the voltage regulator. I did not put in any sort of resistor wire. The only resistor that might be on the tractor is on the ignition switch which I am not sure what it does. Can you elaborate on the resistor wire and the need for it? Thanks.

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Steve

12-04-1999 15:46:13




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 Re: 1010 Does Carb Venturi need replacement??? in reply to Duane, 12-04-1999 04:37:39  
Your description sounds like the carb may be starved of gas. I'd make sure that the fuel line from the tank to the carb is not plugged and that the outlet from the tank is not partially plugged. There may be dirt or rust in the tank that is blocking the tank outlet. I'd do this before I replaced anymore parts on the carb.

Check it out and let us know.



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Duane

12-05-1999 18:50:37




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 Re: Re: 1010 Does Carb Venturi need replacement??? in reply to Steve, 12-04-1999 15:46:13  
I've checked gas flow to the carb and it is good. I disconnected the line out of the glass bowl strainer and even the drain plug from the bottom of the carb bowl. Gas flowed from both of these quite well. After putting new gaskets in the carb it ran better and if I very slowly open the throttle it will do ok and if not under load will run ok at high rpm. But if quickly open throttle from a slow rpm it starts to cough and will die if I don't pull out the choke. Although I haven't tried, I suspect that under a load it will run very poor. I should also say that I had two occasions when acorns were sucked into the carb. The man I bought it from had let it sit with the air hose to the carb off and I guess a critter had used the air filter assembly as a acorn cache. It took me several times of clogging the carb up with acorns until I figured this out. So I thought this may have loosed or messed up the venturi. Acorns!!!

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hunter

12-04-1999 15:16:05




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 Re: 1010 Does Carb Venturi need replacement??? in reply to Duane, 12-04-1999 04:37:39  
Duane, see if you can find a venturi from a local shop. may be you easiest fix. rebuilt my carb on the 1010 a couple weeksago and all parts looked ok cept for the gasket was broken and it was sucking air. good luck



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vance

06-06-2000 15:57:35




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 Re: Re: 1010 Does Carb Venturi need replacement??? in reply to hunter, 12-04-1999 15:16:05  
Duane,
The best thing to do if you can't get it running right is pull the cluster gear out and send it to me. Just kidding. I am new to this site and did not realize there were so many 1010 enthusist. I am in dire need of a cluster gear for a 1962 1010RU. Have had it for about 10 years. My wife proposed to me while I was sitting on it. Don't know if it was me or the tractor. Anyway, it is now in 10 million pieces and hunting despirately for a gear. If anyone can help my wife and I would appreciate it. (601) 482-3006

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