Now that your components are cleaned, reinstall the guide bar on the saw. First, turn the chain tensioners adjustment screw counter clockwise, allow the pin to move back toward the sprocket. This will allow slacking in the chain, making it easier to install. When installing your guide bar, always place the bar with the opposite side up from when you last took it off. Doing so you will displace the wear more evenly on both sides of the bar, resulting in a longer service life.
Place the bar over the bar studs, sliding it as far back as you can. Install the chain on the bar, making certain that the cutting edge of the chain will rotate in a clockwise direction around the bar when looking at it from the sprocket side. Once the chain is placed on the bar and the drivers are properly engaged with the sprocket, position the bar where the chain tensioners adjustment pin lines up with the proper hole in the guide bar. Reinstall the chain sprocket cover ad the nuts but only finger tight as you will need movement on the guide bar to adjust the chain.
The bar will have a slight upward downplay. To adjust your chain properly, turn the adjusting screw tensioning the chain to the point where it sits firmly against the bottom rail of the bar but not so tight that the chain wont rotate freely around the bar. Continue to hold the tip of the bar up and tighten the nuts on the cover. Double check your work by pulling down on the chain and letting it snap back, snugly against the bottom rail. You will need to tighten it some more and if it wont rotate freely around the guide bar by hand, you have over tightened the chain and will need to loosen it slightly. Repeat the adjustment process until the proper chain tension has been achieved.
As the chain gets hot, it will stretch as well as by wear through use. Constantly keep an eye on your chains adjustment when working with the saw. If you see that it is loose, turn the saw off, let the muffler cool down, disengage the chain brake and make the necessary adjustments and remember even a dull chain can be sharp to cut you so always wear gloves when handling the chain or making adjustments.
A loose chain can cause serious damage to your saw and if loose enough can even come off, possibly causing serious injury to the operator. If your chain appears to be sticking to the bar or will not rotate smoothly when you accelerate the saw, turn off the saw and check it to see if your have bar and chain oil in the bar and chain oil reservoir. You can check to see if your oiler is working by holding the tip of the guide bar near a fresh cut piece of wood, taking extreme precaution not to let the tip of the bar touch the wood and accelerate the saw with the chain brake disengaged. If the oiler is working, you will see a fine film of oil that will appear on the wood. If you have sufficient bar and chain oil and your oiler is working properly but the chain will still not rotate, you should take the saw to your nearest authorized dealer for necessary repairs.