Carburetor trouble

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  #1  
Old 03-03-11, 06:56 AM
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Carburetor trouble

I have a Yard Machine Tiller by MTD Model 21A-121R900.Serial 18236000304 2 cycle .I replaced all of the plastic tubes to/from the carburetor & the primer bulb. Now the engine is hard to start but when it does start it runs for only a very short time ,then stops. When I prime it as directed gas runs out of the air intake.Gas does not fill the plastic tube running from the gas tank to the carburetor.I believe I have connected the tubes incorrectly but have no directions nor picture of the correct placement.Please advise.
 
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  #2  
Old 03-03-11, 08:57 AM
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I think this is the routing for your engine.
I borrowed the link below from another poster, i don't think he will mind. Have a good one. Geo

Poulan Pro Gas Trimmer Carb Fuel Primer Diagram - HobbyTalk Member Photo Albums
 
  #3  
Old 03-03-11, 01:35 PM
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Geo,thank you.My tubings are all the same size.I opened another small engine & found that some way I had made the correct connections.However,I have another problem.The engine starts,runs very briefly then stops.Has done this repeatedly.The clear plastic diaphragm was clean,no tears,etc. The black plastic diaphragm {?} on the other side looks to be in good condition.I'm lost. Tom
 
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Old 03-03-11, 03:11 PM
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Were the diaphragms soft and pliable able to flex easily in all directions? Or some stiff and snap a bit when flexed?
Especially the metering diaphragm, the one with the spoke wheel looking thing on it?
Also could be the carb has some restriction and needs to be cleaned and or soaked is best. Especially if the primer is hard to push or slow to release.
 
  #5  
Old 03-04-11, 05:52 AM
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I didn't remove the diaphragms.The metering diaphraghm moved freely. I'll go back in & clean,check the flexing. Thanx.Back to you later.
 
  #6  
Old 03-04-11, 12:31 PM
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I removed the diaphraghs,washed out the carburetor. Both the diaphraghms moved freely & were in good condition.I made a round trip of 60 mi.& took it to a shop.I had exhausted my store of curse words & found I was repeating them. Thank you for your attempt to help,small engines aren't the best thing that I do. Tom
 
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