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Why does my Stihl HS85 draw in so much full that it floods the cylinder

Cleaned both filters, choke off, checked both L and LA carburetor speed screws, fresh 50:1 fuel. Still sucks in far too much fuel and then motor stops.

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Screws should be turned all the way in and then unscrew 1 and a half turns out

Posted on Dec 03, 2014


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Stihl fs 86

I am a Stihl mechanic. We tell all our customers that the proper starting procedure for a Stihl is as follows. Turn on the switch. Set the choke lever to full choke. Prime the primer bulb three times(if it has one) and pull the pull rope NO MORE THAN THREE TIMES with the choke on. If the unit has not tried to start after the third pull, open the choke lever and pull till it starts. Sthil carburetors are notorious for flooding after pulling the rope more than three times on choke.


Oct 08, 2013 | Garden

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My Echo SHC-212 floods out and will not start. Even with no choke and throtle wide open it will still flood cylinder. I have good spark.

Check your choke prime bulb and carburetor lines - sounds like its clogged and gas is barely leaking into flood the cylinder

Jan 25, 2013 | Echo Garden

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Is it the carbeurator if the chainsaw is flooding?

`It could well be the carb flooding, however if you have been cranking the engine for a time without it starting it will keep drawing fuel into the cylinder, you need to remove the spark plug, switch the on/off switch to off, make sure the choke is off, crank the engine until no more fuel comes from the open plug hole, now leave with the plug out to allow it to dry out, refit the plug and try to start with no choke and wide open throttle.

Dec 28, 2012 | Stihl Models 064, 066, Ms640, Ms660

1 Answer

My 98 xr400 will not start. It seams to be flooded but it doesn,t even sputter if I don't move the choke at all. If I put the choke on half open it almost starts but then I think it floods. I changed...

Check to see if you have spark. Put a plug in the cap and touch the cylinder , kick it over to see if the plug is sparking. I kick mine 2 or 3 times to prime the cylinder holding decompression lever in. If it pops on full choke but does not start I go to half choke. If it does not start after 3 or 4 kicks , then I turn off the choke and kick it over 5 or 6 times with the decompression lever pulled to clear it. Then I will kick with no choke or half choke. Honda's are notorious for being cold blooded so when it starts let it warm up and do not be afraid to drive a short distance on half choke till the motor warms up a little.
When the machine is hard to start after sitting I usually start by removing the carburetor and shooting carburetor cleaner through the jets and passageways.I have always found my 96 xr400 to be a dependable starter with fresh gas and a clean carburetor. If it is flooded use the decompression lever to clear the cylinder.

Dec 31, 2010 | 1998 Honda XR 400R

1 Answer

Starts fine runs good for 1-2 minutes then dies. starts up with several pulls or choke. then dies again. changed the sparkplug no differance. cleaned the airfilter same result. george from texas

Check the fuel filter and muffler for plugging. Check the fuel tank vent for plugging. Check the fuel lines for damage or decay. Check all of the carburetor fasteners for tightness including the mounting hardware for the carburetor to the cylinder. The carburetor does not appear to be pulling new fuel into itself after running on the initial prime. If the above hints don't help, you may have to service the carburetor. Check the gaskets and heat insulator block behind the carburetor for any obstruction/damage of the impulse passage which allows the carburetor to pump fuel. Hope this helps!

Jun 17, 2010 | Stihl Chain Saw Handle Models 064 066...

1 Answer

Stihl st410 , after first pull it fires then turn...

Remove the carburetor and open the lower chamber--check the condition of the diaphragm and fuel metering valve--either of which can cause flooding. The diaphragm should be flexible and not cracked or have holes in it. The metering valve point should be in good condition. Go to: for a 12 page article on Walbro brand carburetor theory and troubleshooting. This information applies to nearly all saws even with other brands of carburetor. When you have the carburetor installed, remove the spark plug, open the throttle fully, choke and ignition switch off, then pull the engine through to expel the excess fuel from the engine. Reinstall the plug and attempt to start normally. Hope this helps!

May 17, 2010 | Garden

1 Answer

Stihl 011 av wont start

Flooded? Try a new plug, or get that one cleaned up. If it is sparking and wet, it should fire, even if it doesn't run, it should spark. Did you put the jets or the needle valves back to where they were? I think they start out at 1 1/4 turns out , then adjust the low and high. If it is fouling out with too much gas, the low speed jet is open too far.

May 07, 2010 | Oregon Scientific Complete Carburetor for...

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Echo pole saw boggs aand wont reach high rpm. I need to reapeatedly manipulate the choke lever for it to stay running. New plug,clean air filter including pick up tube in tank. New fuel lines and primer...

If you must choke it for it to run it is lean. Have you attempted a carburetor adjustment? Start with "H" and "L" at 1.5 CCW from lightly seated. Then try this:
Carburetor Adjustment by
CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; marred adjustments are difficult to impossible to set properly.
Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run.

There are 2 wav (sound - idle & full – not highlighted) files that I find most helpful, I think you will too.

An air leak where the carburetor bolts to the engine or the intake manifold can also cause this. If an adjustment does not or has not fixed this I suggest you try your friendly neighborhood Stihl shop. Explain everything you have done to a mechanic there. Good saw shops pressure test the crankcase, fuel lines, and intakes. They have test equipment homeowners do not. Explain what you have already done and ask for a repair estimate. I think you will be pleasantly surprised. Not all small engine mechanics are created equal... why I recommend Stihl. The odds of finding a good mechanic at a certified Stihl shop are in your favor. If not already using 50:1 fuel mix, please ask the Stihl shop what they recommend. Echo on their site has a statement equivalent to "regardless of what your manual says use 50:1". HTH

Jan 02, 2010 | Garden

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