20 Most Recent Troy Bilt Tb70ss Gas Trimmer - Page 8 Questions & Answers

Should first check the fuel filter in the tank. You can take it with wire. Carburetor normally has three screws to adjust. Work to its maximum, then work on low revs and a minimum of machine. Sometimes it is necessary to clean the membrane carburetor (or replacement). You also have the air filter and it must be clean. When you remove the exhaust and look into the cylinder can not see the lines but must be smooth.
Good luck!

If there is no spark at the plug you need a new "ignition module". Here is a link to the part. It is part number B44 on the list.

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...

Hi lowerkeysre...

You will insert enough fuel line into the tank to be able to get it outside of the fuel tank opening...this is to be able to install the fuel filter on it and drop it back into the tank.
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Hi bigdjslam...

Sounds like you have dirt/debris in your caburetor jets,fuel passages or a diaphgram that is becoming non-flexible.
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:
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 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 weedeaters/trimmers.
When you remove your fuel lines from the carburetor be sure to make a drawing to how the lines are connected to the carburetor.
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 mix if your using a two cycle weedeater/trimmer with the oil to the right mixture and not too much oil as it can cause hard starting.
If the weedeater/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 indetion 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.
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Here is my Tip(s) on this problem:
www.fixya.com/support/r6270682-trimmer_weed_eater_string_replacement

Jim

• Hi, I can help.
• As you can see from the diagram I have uploaded that repairing the throttle trigger really just involves the removal of 6 screws from the side of the handle. (#1 in the diagram)
• You want to make sure to take not of the throttle trigger spring (don't loose it.) (#3 in the diagram)
• Also the throttle cable assembly (#4 in the diagram.)
• # 29 in the diagram is your switch and you want to make sure you don't drop of loose that either.
• So when you remove the screws they will pull out to the left.
• You want to try to just pop the right side of the handle off to access the throttle trigger. The less of the left side of the handle you have to pull out on to access the throttle trigger the better. Just enough to slide the throttle trigger out and slide the new one in.

• If you have any comment you can feel free to leave them here and I will respond.
• Hope this helps and thank you for using FixYa.

Regards, Tony

You have a bad Ignition Coil (Module). It will eventually stop working alll together. There's no way to tell how long it will last. It could completely die the next time you use it.

Good Luck!

Jim

Try my Tip on this subject:

www.fixya.com/support/r6270682-trimmer_weed_eater_string_replacement

Good Luck!

Jim

Hi sgoins7370...
Your problem is your carburetor for sure...
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:
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 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 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.
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 mix if your using a two cycle mower or weedeater with the oil to the right mixture and not too much oil as it can cause hard starting.
If the 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 indetion 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

The bulb may have a small crack or hole in it. I would replace the bulb since new tubes have been installed.

Here is a video on 3 different heads. Yours is probably the first head that he demonstrates:The only thing that is not demostrated is a left-hand vs. right-hand trimmer. The spool retainer may twist off in the opposite direction if you have a left-handed trimmer.

Good Luck!

Jim

First, the primer/purge bulb does NOT have to fill completely to function. It's purpose is to remove old fue and AIR from the fuel system (carb) and move it back into the fuel tank. You normally will have an air pocket in the bulb. An air leak in the fuel system or loose carburetor screws or fuel lines in the wrong location can cause your problem. Check the fuel line and fuel filter for a good connection in the fuel tank. Remove the fuel pump cover on the carb and make sure the very small, round, wire mesh filter is not clogged with debris. When old fuel lines deteriorate, they crumble and if the filter is broken off, the fuel line to the carb will ingest bits and pieces of old fuel line. Check all these things and post back.Sometimes, if the bulb is on the carb, a check valve in the carb can stick. When you check the condition of the mesh filter inside the carb (opposite the side with the vent hole), then liberally spray with WD 40. Strong solvents and cleaners can SWELL up the tiny check valves in the carb, causing problems. So you see, it is hard to pinpoint exactly what happened without some removal of parts and diagnosis.

Try cleaning the spark plug, make sure it sparks. Put some fresh gasoline in the tank, check start stop switch.
A easy way to check whether the problem is related to carb or not is:
remove the spark plug put some fresh gasoline in the cylinder, put the spark plug back
pull the starter a few times if it starts for a few seconds it means is related to carb.
Be carefully when handling gasoline.

Hello rvan. the ratio is 50:1. the easiest way to achieve this is to buy a 2 gallon plastic gas can and a few of the 2 cycle engine oil bottles that are made especially to add to either one or two gallons of gas. Joe

It sounds like you are winding the line in the wrong direction. You should wind the line in the opposite direction that the head spins during operation.

Good Luck!

Jim

what do you need to know?

there should be a small hole to put string in on center of spool.
you might be winding the line the wrong way around try winding line in other direction.

Hi,

Try here

heatman101

If it is like my Craftsman, if you look down the end of the clutch there is an allen screw way down there that holds it together.