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Its ment to.!!! that's the job of a decompression button.
Procedure:
1.push on off switch into full choke position, depress the decompression button.
2.pull the saw over until it 'fires' once.
3. the decompression button would have popped back up, click the on/off switch up to half choke.
4.pull saw over and it should fire up, revving.! blip the throttle to return it to tick over.
? 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.
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.
replace the decompression valve. also check for carbon buildup on top of piston. usually when a saw stops on its own after 5 min or so.... the piston and jug are scored and need to be replaced.
I might remove the starter cover and inspect the flywheel and crankshaft Woodruf key alignment. If it is good try this: Starter Handle difficult to pull: 1.Remove the starter cover. Does the starter operate smoothly? If yes, reinstall the cover and continue with 2, if no repair starter. 2.Is the saw equipped with a decompression valve? Yes continue, no proceed with 3. ·Leave the ignition off, set the valve and pull the starter. ·Pull gently to release the valve. Is there a difference in the effort required? ·If yes continue with 3, if no repair or replace the decompression valve. 3.Was this saw perhaps operated in a lean condition (metal transfer from the piston to cylinder wall)? This may be caused by many things including but not limited to; leaky intake connections at the engine or carburetor; leaky crankcase seals; cracked fuel delivery lines; running on gasoline containing no 2-cycle oil. ·Disconnect the spark plug wire and remove the plug. Remove the muffler (clean it and the spark arrestor before reinstalling), hold a light at the plug hole and inspect the cylinder through the exhaust port. Is it smooth and shiny or does it appear speckled with dull gray spots or smears? ·Pull the starter slowly, inspect the piston as it rises and falls. Is it a dull gray without scratches and gouges? ·Hold the light at the exhaust port and look through the spark plug hole, inspect the cylinder above the exhaust port. Is it shiny and smooth or speckled with gray spots or smears? Any spots or smears on the cylinder or deep scratches and gouges in the piston indicate the saw was operated in a lean condition. Repair of this on a home owner quality saw often exceeds replacement cost. A repair estimate by an independent saw shop should be considered.
If you have more questions or need additional help please reply below and I will get back to you. Thank you for using FixYa and Good Luck. HTH Lou
The Stihl 026 PRO does have an adjustable oiler and it is located on the bottom of the saw just below the clutch drum.
Stihl also builds an 026 "Standard" without the adjustable oiler, however, the hole location for adjustment is still there.
The 026 PRO will also have a decompression valve on top of the saw to make the rope easier to pull during startup. If you have the DECO valve you should also have the adjustable oiler. Hope this helps.
5 to 10 minutes is a long time and the 026 is a fairly old saw. If it is running 5 to 10 minutes and not 5 to 10 seconds, you probably just have a worn engine. Clean the saw inside very thououghlr and try Amoco white gas. You should be able to reduct the heating and get more run time. A carb rebuild might also help some but in hot weather it is not unusual for chain saws to vapor lock.
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