Question about GAS Motorcycles

1 Answer

Hello I have a troy bilt tb685ec 4 cycle string trimmer and its A joke. There is no choke and no adjustment screw for the air/fuel to be tuned. The thing will fire up and run for about 3 mins and die. Then wait about 5 mins for it to start up again and do the samething. It also will bog down and die if I hold it wide open throttle. Which isn't really full it's only 3/4 throttle maybe from sound and feel. The filter,oil, and gas are new. The plug is fairly new about an hour run time on it. When I pull the plug its medium to light gray in color making me believe it's running lean. Can I throw a carb from another TB and make it run or is there possibly just a clogged passage is the carb? I removed and cleaned it out with carb cleaner with no change. I'm stumped and after reading reviews on this model I'm thinking the trash is the best place for this machine. Any insite on a possibe culprit would be much appreciated. Matt

Posted by Matthew Buchowicz on

Ad

1 Answer

john h

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

  • GAS Master
  • 23,504 Answers

Reclean --rebuild -or replace carb

Posted on May 09, 2019

Ad

5 Related Answers

Anonymous

  • 163 Answers

SOURCE: Leaf blower will not achieve full RPM's

try removing the muffler and scraping out any carbon build up in the exhaust mouth of the block. if that doesnt help you will probably need to replace the carb.

Posted on Nov 29, 2008

Ad
#1 Taper

Jim Parker

  • 1041 Answers

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

#1 Taper

Jim Parker

  • 1041 Answers

SOURCE: Troy Bilt in Hell String Trimmer TB465SS Running Problem

You need to clean the carb. or you may need to buy a carb. kit. But do a cleaning on it first. If you need tips on how to best do this, just let me know. Also check the fuel lines for cracks. As they age, they become brittle.

Jim

Posted on Jun 04, 2009

vincob

vince janis

  • 718 Answers

SOURCE: TROY BILT TB 70 TRIMMER-NEW

If you rebuilt the carb did you turn any of the screws on the carb while cleaning or take out, you might have just the low idle screw closed a little to much open half turn and see what happens. If you look at the carb where needle screws are located on the side,if you have two screws it will be stamped with an " L " and?or an " H " next to each screw. If you only have one screw then turn that one, to left to get more fuel. Good Luck...

Posted on Aug 27, 2011

hunter19_46m

Curtis Sewell

  • 7482 Answers

SOURCE: troy bilt 4 stroke trimmer tb575ec won't run at high rpms. it starts, but dies when throttled up. only 2 months old, added fresh gas, checked oil, did not see adjustment screws on carb?

Hi jim gabriel

Sounds like you have dirt/debris in your caburetor jets,fuel passages
Check/Clean/Replace your Air Filter, a dirty air filter can make your engine run to rich with fuel.
Note: ALWAYS USE COMPRESSED AIR TO CLEAN YOUR JETS AND PASSAGES, VERY IMPORTANT.
Note:Before you disassemble the carburetor:
Write down on a piece of paper or take a picture of how the linkage attaches to your carburetor for later reference when you go to reinstall your carburetor.
Mark each piece with a awl, or some kind of instrument that will make an alignment scratch before you disassemble the carburetor into separate pieces.
That way you will know which way it goes back together when you reassemble it.
Sometimes you can get by with priming the carburetor or by using a very small shot of starting fluid and letting it run a few times like that, and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.
Be sure to check your fuel tank for water and dirt/debris, if there is water/debris then you need to clean your tank.
Check you fuel line condition after a while they will degrade and need replacment.
Check/Clean/Replace your fuel filter if you have one, normally they are located in the fuel tank of chainsaws and weedeaters.
When you remove your fuel lines from the carburetor be sure to make a drawing to how the lines are connected to the carburetor or take a pictue for later reference.
Normally the big line will be the line the fuel filter is connected to inside of the tank.The smaller of the two lines is the return to the fuel tank from the carburetor after it is pumped thru the carburetor by the primer bulb.
Make sure you are using fresh fuel...and oil if your using a two cycle chainsaw or weedeater with the oil to the right mixture...too much oil as it can cause hard starting and excessive smoking.
If the chainsaw/trimmer is over a couple of years old, then I recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank.
The diaphgram may look good and flexible, but it can be deceiving and not act as a fuel pump as it should because it has become too hard and will cause hard starting,start and run and shut off, etc.
When you clean your carburetor, I recommend that you use a laquer thinner type cleaner to clean and dissolve the laquer build-up in the float and needle jet passages.
Be sure to remove all plastic and rubber parts before using the laquer thinner because it can dissolve the plastic parts and render them unuseable.
Be sure to use COMPRESSED AIR to blow out all the fuel and air passages.The higher air pressure is needed to blow some of the trash/debris from the fuel or air passages.
Be careful when blowing out the passages, because there are sometimes small rubber type seats in the bottom of some of the passages.
Keep in mind that the float (if you have one) for the carburetor must be level when you go to reassemble the carburetor or follow the instructions you get with the carburetor kit, or you could also ask the parts man that you get your kit from.
When you clean your carburetor and remove the jet screws, you will first need to lightly seat the jet screws.
But before you lightly seat the jet screws count the number of turns it takes to seat the jet screws from their original position.
Be sure to mark the turns down on a piece of paper.
That way when you put the jets back in, you know to lightly seat them first and then turn them back out to their original position before you started.
Note:
The little spring inside of the carburetor goes under the float arm.
That is where your fuel inlet needle/float valve is located...on the arm at the end.
Normally there is a small indention in the carburetor base and a small protrusion on the underneath of the float arm where the spring will be in the right postion for installation.
The spring will set in the indention and you will install the float arm with the needle/float valve and float rod into position over top of the spring,you will push down until it is in position and then you can tighten the screw that holds the float arm assembly in position.
Once you have your carburetor cleaned/rebuilt that should solve your problem.
Please take time to rate me
Bud

Posted on Oct 13, 2012

Add Your Answer

×

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Runs great, blower and trimmer heads will not turn/work. Tried using the blower attachment and the fan turned very slow


Contact the consumer desk.

TB22 EC Curved Shaft String Trimmer by Troy-Bilt

www.troybilt.com/.../troybilt/TB22EC-trimmer

Troy?Bilt Products
Rating: 3.7 - ‎232 votes - ‎$99.99 - ‎In stock
25cc, 2-Cycle Gas Trimmer / Attachment-Capable Design ... The TB22 EC gas string trimmer is both JumpStart™ and TrimmerPlus® attachment capable, making ...

Gas Trimmer ' TB635 4-Cycle Curved Shaft ... - Troy-Bilt

www.troybilt.com/.../troybilt/tb35-ec-curve-shaft-gas-...

Troy?Bilt Products
Rating: 3.3 - ‎32 votes - ‎$179.99 - ‎In stock
The TB635 EC curved shaft gas trimmer with SpringAssist™ technology features the new Click N Trim™ bump head, making line replacement easier than ever. ..... next one they put on - will only run for about 4 seconds. they've had for about 2 ... Both String Trimmer and Edger work great, easy to start and very low vibration.

Dec 09, 2015 | Troy-Bilt 4-Cycle Curve Shaft Gas String...

1 Answer

Will idle but stalls on acceleration


to much air getting through
being careful not to over tighten or you will crack your inlet manifold
solution: tighten down your carburetor and tune up your carburetor
adjust the outside screw first that is your throttle screw
then once a full revs adjust the inside screw to where you want the max revs to be

Apr 01, 2014 | Troy Bilt Tb20cs 2 Cycle 31cc Gas String...

1 Answer

My 4-cycle troy-bilt string trimmer: string is locked up. I can not pull the string


Your String needs to be re-wound. You are almost out of string or your string has Jammed under the Motor and placing a DRAG on the Trimmer

Apr 08, 2013 | Troy-Bilt 4-Cycle Curve Shaft Gas String...

1 Answer

Gas dripping out of air intake on troy bilt trimmer TB525EC


The diaghrams in the carb could be starting to stiffen up holding the needle open. Does it start with no choke when cold? Rebuild the carb to replace stiff diaghrams

Oct 24, 2012 | Troy-Bilt 4 Cycle Straight Shaft String...

1 Answer

My troy built starts but will not speed up enough to use even after it warms up. It is 2 years old but only has 3-4 hours of use on it . Can you help me?


Is it 2 cycle or 4 cycle? Meaning, does it take plain gas, or mixed gas?

Clean the plug, clean the carb with either choke cleaner (4 cycle) or wd-40 (2 cycle) by spraying it into the choke hole after you take off the air filter.

You may also want to spray some of the choke cleaner or wd-40 into the gas tank with the gas to help clean out the whole fuel system.

Only use choke cleaner for 4-cycle regular gas units. For mixed gas, use wd-40 in place of choke cleaner.

Try to start it and then go back and forth from half choke to full choke until it starts picking up.

Jul 29, 2010 | Troy-Bilt 4-Cycle Curve Shaft Gas String...

1 Answer

Troy-bilt trimmer TB 490 BC


Turn the bump knob clockwise to loosen on my tb490bc.

May 29, 2010 | Troy-Bilt 4-Cycle Curve Shaft Gas String...

1 Answer

Carburetor


there is an air fuel ratio screw loosen that off and it will run off choke

Jul 24, 2009 | Troy Bilt Tb425cs 26cc 4 - Cycle Curved -...

1 Answer

How to replace air filter on Troy-bilt TB20CS?


May be air filter but sounds more like your muffler is stopped up. First take the muffler off and see if it runs better without it. If so, burn the carbon out of the muffler and clean the muffler port on the engine. If not, then remove the four screw at the very end and disassemble. The ait filter is in that area. Diagram is located at
www.stollerlawnandgarden.com/.
Click on parts lookup in left hand column.

Jun 24, 2009 | Troy-Bilt 4-Cycle Curve Shaft Gas String...

Not finding what you are looking for?
Motorcycles Logo

Related Topics:

746 people viewed this question

Ask a Question

Usually answered in minutes!

Top GAS Experts

Marvin
Marvin

Level 3 Expert

85239 Answers

Lawrence Oravetz

Level 3 Expert

10548 Answers

Brad Brown

Level 3 Expert

18520 Answers

Are you a GAS Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...