Hi,i have a stihl 026 chainsaw with a bad flooding problem.I have checked the inlet needle in the carb and it is not stuck.I replaced the diaphrams and double checked that i installed them properly.After re-assembly,2 pulls on the starter and the crankcase is full of gas and pouring out the muffler ! This saw has been trouble free for years and well maintained.any ideas would be greatfully appreciated,thankyou.......steve

Check out ebay under name of the chainsaw. The carb is either a Zama or Walbro and there are plenty kits available for less than 10 dollars.

Part 4: Stihl chainsaw piston and cylinder replace / repair ...

? 13:54
https://www.youtube.com/watch?v=jCbMCkGqCIQ
Dec 15, 2011 - Uploaded by Andy Reynolds
Refitting the cylinder to the rebuilt crankcase on a Stihl 026 chainsaw. ... Part 4: Stihl chainsaw piston and cylinder replace / repair. .... Part 3 Stihl 026 chainsaw fitting the rings, piston, anti vibration mountings - Duration: 15:10.

Part 3 Stihl 026 chainsaw fitting the rings, piston, anti ...

? 15:10
www.youtube.com/watch?v=n9RbtjNc-nc

Dec 16, 2011 - Uploaded by Andy Reynolds
Part 3 Stihl 026 chainsaw fitting the rings, piston, anti vibration mountings ... Part 4: Stihl chainsaw piston and cylinder replace/ repair.

Check and clean carb, sounds like the needle isnt seated in the carb properly, also check and possibly replace carb diaphrams

Check fuel filter, fuel tank vent and possibly clean carb and replace carb diaphrams

Do you have good compression.

If its flooding then its probably a carb issue. Strip and clean carb, check diaphrams and reset hi and low screws to standard settings. Screw both needles in and unscrew them:- H 3/4 of a turn anticlockwise and L 1 full turn anti clockwise.

Here's the breakdown for the carb. (dont use airlines to clean carbs)

The only reason for fuel pouring from the carb is the inlet needle under the metering diaphram is leaking, as the machine has not done a great deal of work it could just be dirt in the seat, you need to remove the metering cover from the carb, remove the diaphram and gasket, you will them see the metering lever connected to the inlet needle, the needle has a rubber tip, clean or replace the needle and blow out the seat.

There tank vent is in the top of the fuel tank, you would have to remove the tank to get to it, it is a small plug and a duck bill valve, as this system only allows air into the tank and not out, there will always be a pressure in the tank, if the carb is flooding it is due to the rubber tipped needle under the metering diaphram leaking, not an issue with the breather, you realy need a small bulb pressure tester to test the needle seating, apply 2/3 psi into the fuel inlet conection on the carb, the needle should hold this with no like on the tester dial, if you do not have a tester all you can do is replace the needle and hope you have cured it, do remember that when re fitting the diaphram and gasget back on the carb, the gasket must go on first, and the diaphram last, it acts as a spacer, if you fit the other way round it will flodd because the diaphram is too close to the needle, the metering lever should be set level with the sides of the carb.

The carb is flooding, as it runs out of fuel it leans of and runs normally, get the carb pressure tested, or just replace the inlet needle under the metering diaphram, and try again.

sounds like you have a carb ,flooding or breather problem

check breather to make sure tank can let air in

check carb fuel pump for holes , check for debris , check hinge pin & lever and needle for sticking , and check lever hight it should be flush with chamber floor , check metering diaphram as well all diaphrams should be soft and pliable

if in doubt rekit carb with rebuild kit , also check for blocked / restricted muffler

cheers

if it starts then its gettin fuel,but it might not be gettin enough.or it might be gettin too much. after it starts and dies remove spark plug, if its wet then the saw is flooding out, try cleaning the plug and airfilter,u can also add some seafoam to the gas,it will help clean any dirt out of carb. if that dont help check the carbs diaphram