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My Husqvarna 435 won't start. Has spark, and seems to be getting fuel. Good compression. Also cleaned carb,and everything looks like it's working properly, no holes in the rubber carb diaphragm. Help!

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If this is a 2 stroke motor, the mixture is too rich

Posted on May 19, 2017

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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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Husqvarna 36 cc chainsaw wont start replaced spark plug cleaned carb


Are you getting a spark..? - NO? check wiring loom from ignition module, check timing gap between flywheel and ignition module, check on/off switch.
Does it have compression.? - NO? then check piston/rings and cylinder
Is fuel getting to the cylinder.? - NO? Carb problem of fuel line issue

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I have a kohler 12.5 in my J.D. STX38. Starts and runs good but has a slight miss on low idle. It may have it at high idle but you cannot notice it. The carb has been taken apart,cleaned, carb kit...



hi there harryandmeli
sounds like you still have a restriction in your carb or the float level is not right
check all the opening s and jets carefully, particularly main jet and emulsion tube air bleeds
and the idle air bleed , and idle jet, is the tank clean and no water ? , is the tank breather working ?, make sure gaskets at carb flange are ok - no leaking of air , make sure air filter is not blocked ?

provided compression and spark ok,( spark should jump a 6 mm gap minimum ) to pass a coil test and fuel flow from tank to carb is good , these engines have hydraulic valve lifters and like 10w/30 kohler oil , everything being = engine should run good

remember F A C T S

F = Fuel , A = Air , C = Compression , T = Timming , S = Spark

take a look

cheers hope it helps

pauly46

Sep 16, 2011 | Garden

1 Answer

Husqvarna Model 51 won't start. Was running fine and has never had a problem starting (owned since new, 14+ years). Chain slipped off. Fixed and then saw wouldn't start. Good bright spark &...


If you have a good spark, and there is fuel at the plug, the only things to stop it fireing up are a sheared flywheel key knocking the timeing out, or the engine has low compression due to wear or damaged piston and ring.

Sep 07, 2011 | Garden

1 Answer

K750 got it started briefly after 30 pulls and then it shut off seems its not getting any fuel. I changed fuel line and filter spark plug. It gets good spark. Help


check your compression, then make sure the fuel vac pulse line if it has one is not cracked, this creats vacumn when engine is rolled over which in turn pulses your fuel pump to pump fuel through carb. look in the spark plug hole with flashlite and look for scores in cylinder and piston, maybe remove muffler and look at cylinder with flashlite and make sure your rings aren't cooked to piston causing low compression. Sorry I got carry'd away, make sure your fuel filter is clean, fresh fuel and clean your carb and check diaphrams for being stiff if so replace them. Good Luck

Aug 02, 2011 | Husqvarna Garden

2 Answers

Hi, I have Husqvarna chain saw model 357XP serial no 2006100483. The saw has suddenly refused to start and engine does not even fire. I was using it one day and on the next could not get it to start. I...


Hi workflow,

Let me thank you for the excellent description of your problem, the symptoms and whats been done so far.

You have done everything I would have done so far.
If you have fuel, compression and spark, there is only one thing left, air.

  • Check the air filter for particulate matter and clean if needed
  • Check the choke linkage
  • Check the carb / trigger linkage
Withe the plug out, pull the cord a few times. The fuel air mix should come out as a fine mist.

How high is the compression? >80psi?

Have you tried starting ether?

Off the top of my head,

Mike12ca0de.gif

Aug 30, 2010 | Husqvarna Garden

1 Answer

Husqvarna 51 died and wont restart


hi
if you have a good compression,a strong enough blue spark and carburetion for the fuel air mixture try priming the engine(put small amount of gas in the spark plug hole)then start the engine.If the engine runs only the gas you put inside the cilinder there is a carburetion problem to find and fix.
let me know regards savumihai71

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1 Answer

Husqvarna 55 Chainsaw (1999) - Runs OK for 1 minute then stalls


I think your on the right track
Blowing compressed air through your tank vent
is great but it is way more air than the natural asperation
that the saw pulls on it own
I would replace the vent cap and also look for a pinched fuel line between the fuel tank and the carb

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1 Answer

It wontt start it has spark


There are only three things that your bike needs to start, Spark, Compression and Fuel, if you say that it has spark and compression then the problem has to be fuel, Make sure that there are no blockages in the line from the tank to the carb, if that is not the problem then you will have to pull the carb and clean out all the ports. I disassemble them as much as possible and empty a can of carb cleaner into a clean coffee can let it soak overnight and then blow out all passages with compressed air and reassemble. You should also pull off your reed cage and check to make sure that your reeds aren't cracked or broke. If your bike was runninng before and you give your carb a good cleaning and the reeds look good and it still doesn't work then you are going to have to look at the other two requirements, your spark should be a bright blue, if not try a spark plug first (you may want to try that before the carb cleaning) next you should get a compression tester and check the compression to make sure it is high enough. Your bike might feel like it has lots of compression but it might be low enough to make it hard to start.

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