Old craftsman rototiller 6.5 hp starts but does not stay running

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  #1  
Old 06-26-15, 12:52 AM
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Old craftsman rototiller 6.5 hp starts but does not stay running

Like I said in title...it does not stay running..its really old belt driven tiller

it will start and within second it will die...

I tried in choke,half choke and without choke ...all 3 position and also tried in idle and fast setting ...nothing works..

does it need carb rebuild? or something else?
 
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  #2  
Old 06-26-15, 06:19 AM
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Most likely it's at least time for a carb. rebuild.
I'd conceder also removing the fuel tank and flushing it out, replacing the fuel lines, adding a fuel filter.
This is one tool that most people use for a short time and leave it sitting for a year with the old fuel in it, then expect it to start right up.
Most often that's just not going to happen.
Using nonethenal fuel, adding a fuel stablizer, letting it run out of fuel when your done using it will go a long way to prevent issues.
 
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Old 06-26-15, 06:26 AM
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No information about the motor model or carb, so we are just guessing... but I had an old roto tiller with this style of carb...

012.jpg Photo by zephyr338 | Photobucket

First thing every year to get it running I would always have to take off the pump cover on the side (remove 4 slotted screws and tap cover to remove) and clean and lube (or replace) the gasket. Not pumping gas = not running for long. Just be sure you don't lose the spring and cap that are under the gasket! They may fall out when you remove the gasket, so take note of their position.
 
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Old 06-26-15, 07:47 AM
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Thanks...but rototiller was working in half choke mode just before it stopped working so it was not first time this season..

after couple of days it worked when we tried again it stopped running...like I said it would start but won't stay running...
 
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Old 06-26-15, 07:55 AM
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was working in half choke mode just before it stopped working
Pretty good indication that the initial advice is on the mark; time to rebuild the carburetor. They are pretty straight forward, and any small engine shop, lawn and garden sales, whatever should have a kit with the gaskets and wear items. Make sure to take the engine numbers or the carburetor itself with you. Pay attention to how the linkage is now, so that you can put everything back in the same place and you'll be fine.
 
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Old 06-26-15, 09:33 AM
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Post the engine model numbers so we can find out what carb it has, if it is a Tecumseh the fix could be as simple as cleaning the bowl nut. Have a good one. Geo
 
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Old 06-26-15, 09:57 AM
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yes it is tecumseh engine ...cant find model no. its too old
 
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Old 06-26-15, 10:38 AM
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Clean the carburetor, that's your problem.
 
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Old 06-26-15, 11:16 AM
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Here is a link to clean Tecumseh carbs. Have a good one. Geo

Small Engine, Lawn Mower, Snowthrower Troubleshooting, Repairs and Safety
 
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Old 06-26-15, 06:49 PM
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I changed fuel line...flush out old fuel and cleaned it very good. And cleaned carburetor but don't know what I did wrong ...now fuel leaks from where there is throttle plate .....I mean the plate which moves when we open or close choke ....can you guess what I did wrong? also, I cant remember how the linkage goes ...this is very old I believe 1st gen carburetor ...I will post pics soon
 
  #11  
Old 06-26-15, 06:54 PM
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The link I posted has about every carb Tecumseh used and how to disassemble and fix, check it out. Have a good one. Geo
 
  #12  
Old 06-26-15, 09:23 PM
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Exclamation

Please check pics attached....I still can not figure out why fuel is coming out where the air cleaner is....any one has idea?

I must have done something wrong when I put it together after cleaning ..it was not coming out like this before...

also can someone show me how to put linkage properly...one of the link which is long ...is just loose(check pics ) because I cant put it together

do u think this loose linkage is causing fuel to leak like this?
 
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Old 06-26-15, 09:27 PM
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Be sure you have the deep side of the bowl turned the right direction (away from the needle). The float needs to be able to hang down into the deep side of that bowl. Sounds like the needle is staying open and gravity is flooding the air cleaner and engine with fuel. You might want to take the spark plug out and give it a pull just in case one of the valves was open to the cylinder.

You could also have bent the float tang or something if you messed with the float and needle at all.
 
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Old 06-26-15, 09:43 PM
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Yes...I had to mess with float and its spring (pin) a little bit because it came apart while cleaning ...so I had to put it back on and not sure if I put it right ...I tried to show in pics... ....and are you talking about the needle that is connected to float with spring(pin) and I believe that needle goes in to seat correct? I did not even know there was a seat in there...I will check again if seat is there or its gone...
 
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Old 06-26-15, 09:59 PM
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Yeah you probably bent the tang, so your float is probably not closing the needle when the bowl gets full.

https://www.youtube.com/watch?v=u2NHxAavU0w

Fast forward to about 7:50.

Your float, as pictured in post #12 is definitely NOT sitting level.
 
  #16  
Old 06-26-15, 11:36 PM
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What do u mean by tang?

I think its center piece in float where clips goes in to....does this clip has to go in particular way in Tecumseh engine?

so this tang can be adjusted? or I need a new float?
 
  #17  
Old 06-27-15, 12:53 AM
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Take the float off and shake it near your ear. Do you hear something sloshing in it?
 
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Old 06-27-15, 08:37 AM
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I can't hear anything....nothing sloshing
 
  #19  
Old 06-27-15, 09:46 AM
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The needle attached to the float closes against a rubber seat down in that inlet hole. That's what shuts the gas off and is why it's leaking. Something is dirty or interfering with it closing or sealing properly.
 
  #20  
Old 06-28-15, 08:05 PM
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Thanks...now it stopped leaking and tiller started working again but I did not test for long time to check if its really working as it should...will keep you posted..thanks everyone
 
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