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KenCat
by KenCat - 21/07/26 03:42 PM
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KenCat
by NormK - 21/07/26 06:57 PM
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Anonymous
Unregistered
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Hello all.
I am rebuilding the Walbro WT48 carb from my Ryan gas trimmer and am curious about adjusting the inlet needle "lever" that the diaphragm pushes on. At rest, the needle is seated well, but when I depress the lever, it does not look like it's pulling the needle up out of the seat very much, if not at all. What is the proper adjustment for this? The engine would starve at open throttle but idles and starts just fine, and I suspect this to be the problem. Any help would be appreciated!
Alex
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Joined: Dec 1999
Posts: 5,434 Likes: 36
Repair Junkie
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Alex,
First off I would replace the fuel filter before you start playing around with the needle settings. You could cause yourself more problems than you need. The needle does not usually move much and it would be the diahrams that would be causing the problem that you are talking about.
Regards
Bruce
Regards, ![[Linked Image]](https://www.outdoorking-forum.com.au/forum/images/members/mower-monsterw.jpg) Bruce Please do not PM me asking for support. Post on the forums as it helps all members not just the individual.
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Joined: Mar 2000
Posts: 46
Novice
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Alex, as Bruce said the inlet needle does not show much movement,if it did it cause overflooding.The most accurate way to set those type of carburetors is by using a pressure tester. If the lever has not been distorted (bent)at either end (mainly the needle end) once yoy set the lever in the right position,the needle should be set right. The lever should be level with the chamber floor.no higher no lower.To do this, you need a small staight edge or the end of a small metal ruler. Now the most important rule when work on Walbro WA/WT carburetors. WT has a check ball inside so you ["NEVER USE COMPRESSED AIR" to clean it out with. Once you do it will break the check ball loose and the carburetor is permenantly damaged] These carbs are pressurized (also the engine and gas tank) if they can`t hold at least 7psi they will never work properly.Even a pin hole in the fuel line or a gas leak will interfere with the performance and cause hard starting if any at all. thats where a pressure tester comes in. They may be small, but it takes years of experience to "really" know how to work on them. mk.farnam@gateway.net
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Joined: Mar 2000
Posts: 46
Novice
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Alex, as Bruce said the inlet needle does not show much movement,if it did it cause overflooding.The most accurate way to set those type of carburetors is by using a pressure tester. If the lever has not been distorted (bent)at either end (mainly the needle end) once yoy set the lever in the right position,the needle should be set right. The lever should be level with the chamber floor.no higher no lower.To do this, you need a small staight edge or the end of a small metal ruler. Now the most important rule when work on Walbro WA/WT carburetors. WT has a check ball inside so you ["NEVER USE COMPRESSED AIR" to clean it out with. Once you do it will break the check ball loose and the carburetor is permenantly damaged] These carbs are pressurized (also the engine and gas tank) if they can`t hold at least 7psi they will never work properly.Even a pin hole in the fuel line or a gas leak will interfere with the performance and cause hard starting if any at all. thats where a pressure tester comes in. They may be small, but it takes years of experience to "really" know how to work on them. mk.farnam@gateway.net
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