How can i fix my stihl o28 woodboss chain saw?

Yes you do need a Fuel filter which IS Located in the tank. There are 2 ways to put one on. 1st you can remove the tank to carb line altogether and put your filter on and then stick it back in the tank with needle nose pliers and push the other end through the tank hole. Use spray silicone lube, it makes it easier on the fuel line. or 2 you can try to put it on without removing the line which is difficult. To set your carburetor adjustments. John is correct it will get you running. I have found that turning them out 1.5 turns is best. Once it has started set your high speed first. Open up the RPM's and turn the screw both ways until it is running clear in between them and then turn it 1/4 - 1/2 turn more. This will compensate for the load of cutting wood that requires more fuel. Now that, that is adjusted now you need to set your low speed jet. Keep goosing the engine until it snaps right up to high speed. Now when it comes down to an idle if it is idling to high turn your IDLE SPEED (NOT THE LOW SPEED ADJUSTMENT) just the idle speed screw out a little that is on top no the side. If the idle is too low then turn it in a little. This is how to set it.
The reasons for a fuel filter are 1st if obvious. To filter the gas and 2 the filter acts as a wick and prevents it from sucking air.

David
April 2008

The fuel filter on these is usually in the tank itself. Regarding the carburettor adjustments, turn each needle in gently until it stops, then back out one complete turn. That should be enough to get things going. Also ensure that the air cleaner (s) are absolutely clear.

John
March 2008