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Toro trimmer w/walbro wyj carb starts fine but will only rev up about half the rpm it should it sounds very doggy and laboring i have completly cleaned and adjusted the carb to i believe to be proper settings thanks for any help in this matter

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Hi have you tried removing the exhaust it may be blocked with carbon or the port on the cylinder head may be blocked.

Posted on Jul 25, 2009

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Stihl FS85 starts fine, But not take full throttle


Pumping the primer bubble while the engine is running should cause the engine to over fuel and stall (if the tuning is correct). Sounds like its not fueling enough, pumping the primer is forcing fuel through the carb causing the engine to pick up rev's, but this is soon exhausted which is why it wont rev on the throttle.
* Check that the fuel line is not damaged and drawing in air. (if this is intact try the next step)
* Strip and clean the carb. Replace any diaphrams if needed.
* Check gaskets seal between carb, air filter and cylinder.

Just out of curiosity what standard carb settings did you use.?

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Carb on srm400be want rev up


Check the spark arrester on the muffler outlet if fitted to see if it is carboned up, if not check the exhaust port has not blocked with carbon

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Starting mac 3227 trimmer


As you have done most things, i would suggest you have a massive air leak, either through the cylinder or crankcase gasket, or through the crank seal, i think its time to pull the whole engine down and replace these items.

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Have two string trimmers, both hard to start. shindawa homelite 62061 & toro TB21EC. H/L does great job when it starts. Toro won't come up to speed. Have cleaned carbs in both and checked plug


When you say it will not rev up to full speed, that sounds to me like a blockage either in the spak arrester in the muffler outlet, or the exhaust port is blocked, or the muffler itself is blocked.

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My Husqvarna 128ld trimmer will run but only at low rpm. I cant find a tool to adjust the carb. If I choke it 1/2 it will run at higher rpm, I suspect a fuel problem. It started in an instant.


If it is a newer trimmer it has a little plastic deal on the adjustment screws to prevent adjusttment.(epa). You have to break that off then a screw driver will work. Some are tough, turn hi speed screw counter clockwise it will rev

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Toro straight shaft interchangable head trimmer starts hard


on the carb it has two letters and a # take the to a small engine shop and have them get a kit for it price should be under 15 dollars

Jul 22, 2009 | Ryobi Cultivator

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Parts number


You need to know if it is a walbro or a zama carb. to start with.
then look closely at the carb. and find #`s
very small

walbro will be wt or wa then some #`s
zama will be c1q or c1u and some #`s on the opposite side of carb.
Walbro will be on the same side

you need to know the carb. #`s so a kit can be found for that particular carb. IE: complete kit or diaphram kit

May 20, 2009 | Homelite Consumer Products MightyLite...

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