Adjust the carburetor on a parker walk behind left blower mod-HT

Cause 1Spark Arrestor
The spark arrestor is a small screen that prevents the engine from emitting sparks. Over time, the spark arrestor can become clogged with soot. If the spark arrestor is clogged, the engine may stall. To unclog the spark arrestor, remove it and clean it with a wire brush. You may also replace the spark arrestor.

Cause 2Carburetor
The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the leaf blower for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the engine to stall. If the carburetor is clogged, try cleaning it with carburetor cleaner. If cleaning the carburetor isn't effective, rebuild or replace the entire carburetor.

Cause 3Carburetor Repair Kit
The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the leaf blower for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the engine to stall. If the carburetor is clogged, try cleaning it with carburetor cleaner. If cleaning the carburetor isn't effective, rebuild or replace the entire carburetor.

Cause 4Fuel Filter
The fuel filter might be clogged. A clogged fuel filter is most commonly caused by leaving old fuel in the leaf blower. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog the fuel filter and cause the engine to stall. If old fuel was left in the leaf blower, drain the old fuel from the fuel tank and replace the fuel filter.

Cause 5Air Filter
The air filter may be clogged or dirty. If the air filter is clogged, the engine will get too much fuel and not enough air. As a result, the engine may stall. If the air filter is clogged, replace it.

The carburetor has 2 adjustment screws. One for idle and one for high rpm. They have weird heads on them to keep you from adjusting them without purchasing the proper adjustment tool. Look on ebay for carburetor adjustment tools for your particular blower. After you get the too, you can start the blower and make your adjustments. First one screw at idle, then the other while holding the trigger on full. The best way is to first turn the screws all the way to the right (closing the jet) then turn them back to the left 2 1/2 turns. This can be done prior to starting the blower. Then adjust accordingly until the blower runs at the best speed for the idle then at high rpm. You'll notice that the rpm's drop if you go too far either way. If you screw it up, go back to closing the jets all the way to the right, then open them back up to the left 2 1/2 turns. Good luck!

The fuel air ratio is incorrect. If it has an adjustment screw on the carburetor, turn it slightly right or left, don't worry because you will "hear" the engine differentiate..

I own one of those, assume it's the same model. I'd go to the B&S carb page. If that doesn't help, you can contact them. https://www.briggsandstratton.com/eu/en/support/faqs/adjusting-the-carburetor

Had the same problem with my toro blower 5/24 and small engine guy told me that there is a screw underneath the carburator adjust it out (left) about a quarter of turn. I did that and the blower ran good for awhile but it is starting to run rough again so I think I will take it in and have it tuned up. It sounds to me like a fuel delivery problem, could be some gunk in the carberator. TW

Here is how to adjust a Zama diaghragm carburetor:
http://www.zamacarb.com/tipspage.html

Your problem is most likely the carburetor or the governor. Most

carburetors can be cleaned and rebuild but most owners will not

have the proper equipment to do a thorough job. Take it to a good

servicing dealer for his advice and estimate. Sometimes there is a

gasket or a valve problem and a good experience mechanic can

tell a lot by just listening to the engine for a few seconds.

1. Carburetor is dirty.
2. Air leak in carburetor or intake manifold (e.g., bad O-ring, gasket, primer).
3. Carburetor is improperly adjusted

These are some of the more typical reasons that can cause a small engine to surge.

If the blower has ran ok in the past but now not so good I doubt it is the adjustment to the carburetor, I would suspect bad fuel or old fuel first. Empty the blower of gas, pump the primer ball until all of the fuel is pushed through the carb and back to the tank. Add fresh fuel with a premium grade oil (I use gold spectra) and try it again, carburetors typically do not get out of adjustment. I own a 125 BT and have never had any trouble with it other than skunky fuel left over from the previous season.

Have Mod and ser #'s available

http://www.searspartsdirect.com/partsdirect/index.action?sid=PSHx20080129x00001