How to keep motorfrom bouging down when throttled up on a tb625ec weedeater and thier are no adjusement screws on carb

SOURCE: difficulty adjusting carb for smooth idle and full power tilling

Your quickest fix for this problem is to simply replace the carburetor, a Zama K54A. Do it all the time. After that, if you can find a 2 cycle oil, Opti-2, it's the best you can use and it's a one mix for all your 2 cycle equipment (blowers, trimmers, chainsaws, etc.) It's the only 2 cycle I sell in my shop.

SOURCE: 1986 YF 60 4-Zinger. carb settings

The air/fuel screws won't have any effect on the top end. That would be governed by the main jet. Did you install the Boyseen Reeds? If this is a new addition it could be the problem. Another thing could be the fuel level in the carburetor bowl. When you tore down the carb it is possible the float got out of adjustment. You could drop the bowl and see if the fuel level is correct. If not, bend the tab on the float to adjust it.

SOURCE: I have a Echo SRM2601 line trimmer w/a walbro

some have a small bolt behind it, or your threads are strip

SOURCE: How do I adjust a Mikuni roundslide carb. Thanks

Turn the air screw and the throttle screw inward until they LIGHTLY seat. Now turn each of them outward one and one half turns. This is the factory setting. You might want to clean the carbs. After cleaning, before you put the slide back into the carb, move the clip on the jet needle downward one notch. This will richen the fuel mix and help with the bog.

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Roy Cagle

• 1545 Answers
• Posted on Oct 30, 2010

SOURCE: need "L" and "H" setting on carb mixture screws

Lightly seat the screws all the way in....then back them out about 1 and 1/2 turns. From there here is how to do the final Zama diaghragm carburetor adjustments.
http://www.zamacarb.com/tipspage.html

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