Question about Troy Bilt Tb20cs 2 Cycle 31cc Gas String Trimmer 17" Cs

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Tb20cs replaced primer bulb & all the fuel lines will start & run but very rough won't accelerate where is secondary adjustment on carb? a picture would be helpful

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Posted on Jan 02, 2017

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#1 Taper
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SOURCE: runs only via primer bulb

You definitely have a fuel problem. But you will have to take the carburetor off and disassemble it. As far as other carburetor parts failing; yes , but it's probably do to old age or much use. You should first take the carb. apart and clean the all ports with a Den Tek Brush, (used for cleaning teeth), they work great for this job. The smallest particle's can keep the carb. from operating properly. Also, check for a small screen that filters the fuel. It sets down in a larger port. It can get clogged as well, or even blocked completely. If after you have done all of this and it still doesn't work, you will need to purchase a carburetor kit for unit. It will come with various gaskets, a screen, and a needle valve. this should definitely solve your problem. You will also want to change your air filter, (if you haven't already), because if it is old and dry rotted, pieces of the filter can get sucked into the carb. that you just spent an hour or so cleaning. You will then have to disassemble carb. and clean again, NOW THAT WOULD STINK!!
Good luck.

Posted on May 25, 2009

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#1 Taper
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SOURCE: Troy Bilt TB 465SS Pony 4 cycle weed trimmer won't start

Sounds like you need to take the carb. apart and clean it. I like to use a Den Tek Brush, (used for cleaning teeth), to clean the small ports in carb. they work great for this job. Make sure to either clean or replace the small screen in thcarb. as well.

Jim

Posted on May 26, 2009

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SOURCE: primer bulb won't prime

it sounds like the filter on the fule line is cloged try to remove the filter and then try to prime the trimmer. it it does you need to replace the filter. just about any filter that will fit will do.

Posted on Jun 10, 2009

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SOURCE: TB20CS gas trimmer, primmer bubble won't pull in gas

The carburator has a sereis of one way check valves that get cloged very easily.
If you remove the carburator and clean it out with a simple cleaning solution you should be able to clean it up.Do not use compressed air.

Posted on Aug 04, 2009

bbap
  • 71 Answers

SOURCE: my Troy-Bilt trimmer Model TB20CS will not

You have done and are doing exactly what is necessary to solve your problem.
Lastly: remove your carburetor and clean it thoroughly using carburetor cleaner available at most auto parts stores. Replace the diaphragm and metering diaphragm. Diaphragms become stiff with age and with modern fuels and will not pull enough of a fuel-charge into the combustion chamber.

Posted on Sep 27, 2010

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Sounds like air in the system, take spark plug out, pump bulb 3 or 4 times, replace spark plug and try to start. Repeat.

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2 Answers

Ryobi 410 mini tiller w/Walbro WT149A primer bulb won't prime. New bulb, new fuel lines, hooked up right, carb cleaned. Been sitting for several years.Runs when fuel is pumped into the fuel inlet.


hello sir, my machine will only start when pumping primmer bulb or squirting fluid in the carburetor than stops. the fuel line has broken off, in most small carburetors this is a ongoing problem.old fuel will crystallize when left in tank for a long time.plugging up ports, fuel lines, small screen in carburetor.fuel lines will dissolve clogging carb.this is why it will run when the choke is on creating a vacuum to where there is fuel forced in the carb to rum,also the gas will evaporate leaving the oil behind clogging up carb.the thing to do is remove carb. and clean out,replacing gaskets or fuel line if necessary.use carb cleaner to clean out carb.make sure to make note where fuel line go.the fuel filter broke off of fuel line letting debris get in carb plugging it up.the muffler is known to clog up a lot on these machines where they want run. the compression should be 60 to 120 lbs any thing below 60 is junk. when adjusting the carb screws turn in all the way than turnout 1 1/4 turns turn in slow until machine runs also you need to check for spark by removing plug and grounding against engine to check spark, ok.a new spark plug would be a good ideal too , if you are going to make these repairs use new fuel line and filter,hope this helps,any comments welcome,thank you, !!

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1 Answer

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Hi There, Check the primer bulb for tare or pin holes. Replace it. Check and clean carb jet it maybe plugged with debree. Also check for spark which you didn't say. Replace with correct plug.
Note; Do not use strong cleaners on rubber seals (O rings and gaskets) They dry up and crack.
If needed use a dabble of grease on seals

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1 Answer

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Clean you needle/ seat inside carb pull apart and clean all out and try it off the w.w. to see if primer works ,also the primer has a check valve internally also make sure that is working, if the primer won;t pull gas through carb it won;t run 2StrokeJim

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PowerMac by McCulloch PM425AV-18 38cc. I have replaced the line from the fuel mixture tank to the primer bulb & replaced the primer bulb. Now the chainsaw won't keep or looses the prime. Now...


Are you sure you have conected the pipes the correct way round, the fuel hose from the tank with the filter on the end goes to the main fuel inlet on the carb, nearest to the alloy pump cover, the other conection off the carb goes to the shorter conection on the back of the primer, the longer pipe on the primer goes back to the tank, just remember the primer pulls fuel from the carb, into the bulb, and back to the tank.

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1 Answer

Walbro WT891 carb on a Craftsman chainsaw. Carb is brand new, all fuel lines and fule filter replaced. I prime the carb with the little plunger, chainsaw starts up and runs out of fuel within 30 seconds....


Who connected these hoses? the normal routing for a machine with a primer is like this, the fuel hose from the tank with the filter on the end goes to the carb fuel inlet nozzel ( not to the primer ) nearest to the pump cover ( cover on carb held with one screw ) the pipe from the metering side of the carb connects to the shorter nozzel on the primer bulb ( suction side ), the longer nozzel on the primer ( pressure side ) connects to the pipe going back to the tank, just remember the primer pulls fuel from the carb,into the bulb, and pushes it back into the tank, it is not actually a primer it is a purge. because it is connected this way it is impossible to flood the engine no matter how many times the bulb is pressed.
Let me know if it starts and runs.

Jan 31, 2011 | Poulan Garden

2 Answers

TB20CS gas trimmer, primmer bubble won't pull in gas


The carburator has a sereis of one way check valves that get cloged very easily.
If you remove the carburator and clean it out with a simple cleaning solution you should be able to clean it up.Do not use compressed air.

Aug 03, 2009 | Troy Bilt 17 Inch 29 Cc Gas Powered...

1 Answer

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you need to buy a primer bulb kit and replace it cost about $8.00 and is easy to put in, the check valve is damaged.

Jul 18, 2009 | Garden

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