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Have a stihl TS420 that wont start. I have changed carb and checked for spark. I did compression check and got 105 psi with 8 pulls still no start. Checked exhaust screen it is clean. Any other ideas

Posted by Karl Litle on

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fixituself

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  • 43 Answers

Check that you have reconnected the fuel and primer lines properly

Posted on Oct 09, 2018

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Anonymous

  • 68 Answers

SOURCE: wont start

Start with emptying the gas tank totally. Refill with fresh gas/oil mix. Todays gasoline ain't that great.
Also after putting in fresh gas and priming if it doesn't fire at all pull the spark plug and if it is dry, pour a about a tbsp. of mix gas in the plug hole. put the spark plug back in and see if it will fire.

Phil

Posted on Dec 09, 2008

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Phil Rivera

  • 83 Answers

SOURCE: 46 cc Sears/Poulan chainsaw will not start

Four things I can think of:
1) There is a short in your spark plug wire. When you bend it to connect the plug in the machine it allows the exposed cable to contact the engine block. Examine the wire all the way to the coil.

2) Flywheel key is sheared ( you obviously know how to take off the flywheel since you checked the seals).

3) Flywheel air gap is not set correctly. Loosen the coil. Put the cover of a notebook or the cardboard piece of a cigarette pack between the magnetic portion of the flywheel and the coil. Tighten the coil down. This will get you the proper gap.

4) Your cylinder/piston or rings are scrubbed out. Even though it passed a compression test, on rare occasions it will loose compression only when it fires. So do the following:

Remove your exhaust manifold. Look into the cylinder with a flash light. You are looking for scratches. Anything larger then a light fingernail is definite proof you need a new cylinder/piston assy.

If it passes that test do the following:

Pour mixed fuel straight into your cylinder until 1/4 full. Slowly pull your saw over while looking into the cylinder. If you see bubbles after the ring/rings go by then you need a new cylinder/piston assy. On rare occasions if no scratches are present on the cylinder wall or piston, you may be able to change just the rings.

First if you can get a inline spark tester so you can see if your getting spark with the plug installed.

Posted on Mar 31, 2009

#1 Taper

Jim Parker

  • 1041 Answers

SOURCE: craftsman blower won't start( 24cc 2-cycle)

You may need to do two more additional things.

First, check the fuel lines for cracks/breaks.

If they are o.k.,then you will need to disassemble the carburetor and spray with carb.cleaner. Make sure the small screen in the carb. is free of debris. Usea Den Tek Brush, (http://www.drugstore.com/products/prod.asp?pid=165357&catid=1152), to clean the small portals in carb. Reassemble and start.

(NOTE: If the cleaning doesn't work, then buy a carb. kit abd replace all appropriate parts.)

If you need further assistance, just let me know.

Jim

Posted on Jun 13, 2009

wd4ity

wd4ity

  • 4565 Answers

SOURCE: suzuki gn125 wont start. checked carb, cdi, coil.

Check the valve adjustment. If a valve is standing open just a little, the compression will be too low to start the engine. Check fuel delivery by dribbling a little gasoline into the carb and try starting the bike. If it starts and runs for a second or two, you're not getting fuel into the cylinders. Check you carb again.

Posted on Oct 19, 2009

hunter19_46m

Curtis Sewell

  • 7482 Answers

SOURCE: echo pb 265l backpack blower bogs down at full throtle

Hi ryan...
You still have problems in the carb highspeed circuit..some debris in the passages...
BE SURE TO USE COMPRESSED AIR TO BLOW OUT THE CARB.
(be sure to watch the inlet valve seat, you can loose it and not even know it) Blow the carb clean in a box or something that will contain any part that may be expelled during cleaning.
Please take time to rate me
Bud

Posted on Apr 02, 2013

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Why Do I Not Have Any Spark From The Ignition Module When Spark Plug is in The Cylinder


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1 Answer

How do I fix a Stihl ts420 that won't start?


you have spark and fuel ( quickstart) but it wont fire
probably because the third component to make an engine run is missing and that is compression
If it is 4 stroke then it will be a valve problem or rings--if 2 stroke it will be crank shaft seals or rings
If it is a 2 stroke ,then it is a good thing it didn't start because there is no lubricating oil in starter fluid

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My stihl fs56 strimmer will not start,i have a spark & fuel new plug cleaned carb help please


if you have spark and fuel then id be looking at lack of compression.. damaged piston ring or damaged crank seal/gasket

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Stihl blower will not start


check your abc's of engines first
(intake,fuel) substitute a tiny amount of raw gas in carb intake to see if it springs to life !
(compression) -pull rope slowly to "feel" the piston move up in cylinder to meet resistance , then down again
(combustion,spark) - remove spark plug from engine and place nearby the hole (don't hold it !!!) and pull saw over briskly look for spark near tip of plug

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1 Answer

Stihl ts400 quick cut won't draw fuel. New carb installed same problem exists. I am now getting beyond frustrated. It will start and run for a moment on carb cleaner but when its out of carb cleaner i


Check the boot between the carb and the cylinder, it could be an air leak. also check the compression. If the piston rings are damaged then it wont have the compression to pull the fuel through. Could also be a damaged fuel line, or plugged filter.

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1 Answer

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compression under 110 get's is questionable.
check your crank bearings and seal.
also clean carb and check float level

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do a compression check if its under 100 psi could be piston rings are bad or leaking gaskets.

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It would be a good idea to check the compression first to make sure there is enough to make the saw run. A person can run in circles trying to figure out an issue if the compression is below 100 psi, there should be about 150 psi. Older Stihl saws are also notorious for cracked fuel lines. Check the fuel line to be sure it is ok, also check the spark.

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1 Answer

Bike not starting at all. sometimes it starts after continous kicks but no use .agian the same problem.


I would suggest that you cleanyour carburetors.
To tell if they need cleaned, spray carb clean in the back of the carb and the kick it over, if it starts right up, then you need to clean your carbs., Drain your gas tank and install a new fuel filter, and put new gas in the tank too.

If it doesn't start right up on the carb cleaner, then check to see if you are getting spark.
If you have spark, then test your compression.
Compression should be at least 125-145 psi but not less than 100 psi to run.

If you don't have spark, pull power wire off coil and see if you have power to the coil.
If you do have power then your coil is bad.
if you don't have power, make sure your on/off switch is working. check wires

As long as you have good compression, good fuel and good spark, that motor will start.

Pull out the plugs and see if they are dry, or wet or , black and sooty.
If dry - no fuel
if wet - no fire or misfire
if black and sooty - clean & check gap or replace with new ones.

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1 Answer

Im having problems starting an MS250 Stihl chainsaw. Can you give


Chances are good that the compression is not to blame. I would look at:
1. Bad Fuel
2. Fuel Line/filter
3. Carb dirty/mis adjusted
3. Spark Plug
4. Ignition

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