Can i buy carburetor adjusting tools for small engine at auto parts store?

If by "tune up" you mean synchronize, you'll need a carburetor synchronizing tool first. They are either fluid based, mechanical manometer ones or electronic. Search for "carburetor synchronizer". You'll need to take the tank off and hook up a temporary fuel supply (rig it up or buy an external tank). For oil cooled engines like your GSXR/Katana/Bandit that have no fan you will also need a strong external fan to cool it.

This engine has four carburetors and they are synchronized in pairs. Small Philips head screws are located between the carbs. Hook up the sync tool to the vacuum nipples on the carbs. Hook up the external tank. Warm up the engine. Using the idle adjustment knob, raise the engine speed to recommended rpm. Using a screwdriver, adjust so that cylinders 1 and 2 are on the same level (the exact level does not matter). Do the same for 3+4. At last, use the middle screw to eliminate the difference between left (1-2) and right (3-4) pairs.

That's pretty much it. A cursory search on Katana specific forums or Google will yield plenty of more detailed instructions and videos. This is an easy job. The hardest part is hooking everything up, but even that is hard to do wrong.

Based on the majority of small 2-cycle engines out there, I would suggest rebuilding the carburetor. It's easy to do and kits are usually $10 to $12. Remove the air filter and retrieve the number printed on the carburetor. Then, look on eBay or visit a local small engine repair shop for parts. Remarkably, there are a very small number of carburetors used on a majority of different brands with 2-stroke engines. So, if you buy a kit based on the carburetor number, don't worry if it's not directly referenced to your particular brand of blower.

Sometimes, you can get positive results by partially disassembling a carburetor and cleaning it with spray carburetor cleaner from Walmart or Auto Parts Supply store. But, if you're going to that much trouble, you might as well replace parts as you go. Over time, rubber seals dry out and plastic reed valves leak by. Recently, my chain saw was acting up. I replaced hoses, filters, spark plug, etc. Even flushed the carburetor with cleaner. Nothing helped. But, once the carburetor was rebuilt, it purred like a kitten. I've experienced the same thing with weed-eaters and other engines, too. Fortunately, 2-cycle engines are not complex and usually easy to fix. Good luck!

The trimmer needs a carb adjustment, but the adjustment screws take a special tool only available to dealers. Go to poulan's website to find a service dealer near you.

There is a small horse shoe shaped clip around the inside of the crank handle. There is a special tool for removing the clip but if you can push the door panel in far enough you may be able to pop it off with two small screw drivers. For the trouble it takes I'd buy the special tool from an auto parts store since it's cheap.

Sellers on Ebay have the tool. Of course you have to register as a member to buy. The tool is not readily available at small engine repair shops or hardware stores as the manufacturers don't want us to mess with the "lean" settings required per EPA emissions rules (esp. in California). If you don't use Ebay, there are other ways to "turn" those little splined mixture screws. I use wire plastic wire terminal connectors (ring type and splice-connecting type). I tap the ends of the wire connectors (not wire nuts, mind you) over the heads of the screws until tight and proceed from there. The wire connectors I use I think fit 22 gauge wire. If you take them out, cut slots in the heads so they can be turned with a conventional screwdriver. This is a very, very cheap alternative to buying a tool. Small, soft brass or aluminum tubing (found at hardware stores and big box stores) can also be forced down over the heads of the screws. I will include a link to the tools on Ebay and a link on how to adjust the carburetor using the 2 (L and H) adjusting needles.
Ebay Link: http://tinyurl.com/3yuybuf
Carburetor Link: http://www.zamacarb.com/tipspage.html

If you turn the L mixture screw counter-clockwise about 1/8 to 1/4 turn, it will improve the throttle up capability of the carburetor, providing the fuel pump diaphragm and metering-lever diaphragm in the carburetor are not dried up and worn out. They make a special tool for adjusting the screws in the carburetor. Sellers on Ebay have the tool. Of course you have to register as a member to buy. The tool is not readily available at small engine repair shops or hardware stores as the manufacturers don't want us to mess with the "lean" settings required per EPA emissions rules (esp. in California). If you don't use Ebay, there are other ways to "turn" those little splined mixture screws. I use wire plastic wire terminal connectors (ring type and splice-connecting type). I tap the ends of the wire connectors (not wire nuts, mind you) over the heads of the screws until tight and proceed from there. The wire connectors I use I think fit 22 gauge wire. If you take them out, cut slots in the heads so they can be turned with a conventional screwdriver. This is a very, very cheap alternative to buying a tool. Small, soft brass or aluminum tubing (found at hardware stores and big box stores) can also be forced down over the heads of the screws. I will include a link to the tools on Ebay and a link on how to adjust the carburetor using the 2 (L and H) adjusting needles.
Ebay Link: http://tinyurl.com/3yuybuf
Carburetor Link: http://www.zamacarb.com/tipspage.html

Hello,
My name is Dane and I am going to assist you in solving your problem.

You probably have a clogged Carburetor. To clean the Carburetor, you will probably need to remove, disassemble, soak, and use compressed air to blow out the jets in your carburetor. Pay close attention to how the carburetor is attached to the engine. Make a drawing if you need to or take some pictures. Remove the Carburetor from the engine. Remove the air filter, linkages, throttle/choke cables and fuel lines as needed. Remove the mounting bolts/nuts. You will need to disassemble the carburetor as far as possible and put it in some Carburetor cleaning solution. You can get this at any auto parts store. Do not place rubber parts in the solution. Allow it to soak in cleaner as directed, and then blow out the ports and jets with compressed air immediately after you take it out of the cleaning solution. Be careful not to get any spray back on your skin or in your eyes. Reinstall the Carburetor in the reverse order. Replace any worn or torn gaskets or o-rings as you assemble and reinstall it.

If it starts after you are finished with the cleaning, but still runs a little rough, you will need to adjust the high-speed mixture setting on your Carburetor. Turning the high-speed screw out just 1/2 turn or so should do the trick. It is not so hard to adjust the Carburetor, however you do need a special tool that is very hard to get your hands on. They don't make many engines with plain screw heads on the jet screws anymore. The newer Carburetors are factory set lean so they can pass emission standards. If you have a local dealer, they should adjust the mixture for a couple of bucks. If you can adjust the screw, start the engine, allow it to warm up, and apply full throttle. Start backing off the screw just until the engine gets max RPM. That's it. You're done.
Just a TIP: Always mix your fuel with an approved fuel stabilizer. Fuel begins to go bad after a few months and that's why many people have fuel problems in the spring.
I hope I

It sounds like the carburetor needs a small adjustment. The higher end (more expensive) machines are prepped better by the dealers when they receive them for the area (climate) they are sold in. The Big Box Store machines or online sales outlets do not and they are sold as they were when they left the factory. A lot of the Poulan equipment uses Zama carburetors. They are set up and assembled in Mexico for the most part. So, that is that. You have an L (low) and an H (high) speed mixture setting screws on your carb. The L is the one that enables the carb to act as needed to allow the engine to acclerate. These are very difficult for the average user to access as the heads are shaped funny to preclude tampering (EPA rules). A tool to adjust the L and H screws (one tool) is for sale on Ebay. They do not have one at the big box stores or auto parts stores. A very simple home remedy I have found is to use the round end of a #22 wire terminal **** connector or ring terminal or what have you. They are made of plastic and can be lightly forced onto the head of these adjusting screws with a few small taps from a small hammer. Again, the L screw needs the adjustment. Here is a link to exactly how the carb should be adjusted and tuned.
http://www.zamacarb.com/tipspage.html

It's a t-15 Torx tool (screwdriver). You can buy one at your local parts store. Tell them that you want to adjust your headlights.

Autozone and Advance Auto Parts have it, for example.

Yes...they have them on Ebay. Normally you won't be able to get one from a small engine repair place or dealer unless you're "in" with them. You can make using a 22 gauge-18 calibre electrical connector. (Quick disconnects-female) They need to be female spade terminals and you can stick um on the end of a screw driver and then push them down over the round-splined heads of the L and H adjusting needles on the carb. Probably have them at auto parts store....if not Radio Shack.