Green Machine Weedeater

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  #1  
Old 06-23-10, 01:56 PM
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Green Machine Weedeater

I have an old Green Machine Weedeater model 2500. It has a TK carburetor which I'm having a problem with. I cleaned the air filter with mineral spirits and ran the machine for a few minutes. It quit and I found out the air filter had disintegrated. I've taken the carb apart several times and cleaned out all the orifices. The machine will run if I keep the tickler pushed in but quits if I let it go. I'm wondering if the airway from the engine to the carb is blocked. I've tried to blow air thru it but have had no luck. I'm thinking it's plugged up which is preventing the engine from activating the diaphragm to allow fuel into the carb. Any thoughts? Thanks.
 
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Old 06-26-10, 01:39 PM
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An update... I put in a new carb kit, but still same problem. I've blown air thru the fuel pump passage to the engine and it's clear. Any carb experts out there? Thanks
 
  #3  
Old 06-27-10, 04:27 AM
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I tried to find a schematic for your equipment but am having trouble.
question, where does the carb connect to on your trimmer?
if it connects to the crankcase then look for the reed valve possibly broken or a air leak between the manifold cup and crankcase. If it connects to the cylinder then make sure there is no leak between carb and cylinder. I am not experienced with these carbs but want to learn them as well. let us know what you find
 
  #4  
Old 06-27-10, 06:37 AM
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It sounds like it's using the primer circuit to feed the carburetor. It should be getting fuel through the filter/fuel reservoir.

That being the case, the possibilities are filter/lines to carb/fuel pump diaphragm/reservoir needle valve (stuck) or it just needs cleaning. I see you put a kit in it - did the diaphragm/gaskets match up exactly?
 
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Old 06-27-10, 01:56 PM
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Thanks for all of your input. In response to "did the gaskets line up" Yes they did, except I had a small o-ring type seal that I couldn't find a spot for. It is a diaphragm type carb. I found a link to the zama carb website and it seems to operate on the same principle as mine. I would like to know if the mfgr. of the TK carb has a web site. I checked the air passage from the engine to the fuel pump and it is clear. The carb kit had the gaskets for the fuel pump part of the carb and I replaced those as well. The carb connects directly to the cylinder. New gasket there as well. There is a lever inside the fuel bowl that lifts the needle valve off of the seat. I'm wondering if this needs to be bent to make contact with the tickler sooner? Any thoughts?
 
  #6  
Old 06-27-10, 03:21 PM
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Not sure what you're calling the tickler in the last post. The metering lever lifts the valve off the seat as the fuel in the reservoir depletes, allowing the fuel to come over from the pump. If you don't have instructions on setting that lever, just use the old one and put the new valve in. Make sure it matches the old valve exactly.

Usually those diaphragms (pump and reservoir) are backed by gaskets, not only for volume of the reservoir, but for the pump function. Make sure those are checked.

Also, it's not unusual to have extra parts in those kits.
 
  #7  
Old 06-28-10, 04:05 AM
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sounds like it's using the primer circuit to feed the carburetor. It should be getting fuel through the filter/fuel reservoir.
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  #8  
Old 06-28-10, 01:19 PM
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Thanks for all your suggestions. I think I fixed it by bending the lever that lifts the needle valve off of its seat. It runs like a new one now! This is the lever that is actuated by the tickler when starting. You pump the primer on the fuel tank and push up on the tickler to get fuel into the carb. the excess fuel comes out of a drain hose to let you know the carb is full. Thanks again!
 
  #9  
Old 08-05-14, 01:21 PM
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I'm back again with my Green Machine weedeater problem. It was running off of the primer circuit but excess fuel was leaking out of the overflow line as it ran.... not good for the grass. Anyone have any other ideas as to why it won't run without the primer circuit being depressed?
 
  #10  
Old 08-05-14, 02:02 PM
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Think it might be sucking air due to a broken line from the fuel filter ?

Sometimes, the fuel line deteriorates at the fuel filter (which is weighted to remain at the bottom of the tank), but when the line is severed, the end floats up to the surface of the fuel in the tank, and just sucks air.
 

Last edited by Vermont; 08-05-14 at 02:41 PM.
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