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Grass trimmer (weed wacker) engine

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Grass trimmer (weed wacker) engine

Unread postAuthor: Alster370 » Sun Aug 21, 2011 1:24 pm

Im having trouble refurbishing this engine I was given by a neighbour. Ive removed the crankshaft and all the plastic so I just have an engine. Unfortunately to get it all off I had to unscrew all the pull start which is annoying. I don't think I can get it to work on the shaft as it needs to stay still after the engine has started which requires the plastic cover. I think il start it with a drill motor or something. Anyway Im not sure what these little flaps are which sit on the moving rotor. Are they needed?

thanks.
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Unread postAuthor: Gippeto » Sun Aug 21, 2011 1:39 pm

Pictures...or you get "the treatment". :lol:

Double dose if you post "fuzzy" pictures. :wink:

Make and model number would aid in obtaining a parts breakdown as well.
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Unread postAuthor: Alster370 » Sun Aug 21, 2011 1:54 pm

Here it is:

Image

no parts needed, just need to know if these flaps are important and how I could got the pull start to work on the shaft without the plastic cover.

its a wickes 24cc grass strimmer.
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Unread postAuthor: Mr.Tallahassee » Sun Aug 21, 2011 2:24 pm

Those "flaps" are the teeth that hook into the pull-start until the engine starts and the rpm spins them outwards to detach the starter. If those are stuck in place then the starter will not disengage.
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Unread postAuthor: Gippeto » Sun Aug 21, 2011 2:25 pm

Those look to be parts of the directional clutch mechanism for the starter...shouldn't be needed if you're not using the starter...and best removed before they become projectiles when the engine starts.

Wickes is a hardware store in the UK?? Seems they re-badge items made elsewhere.

Might be a sticker or tag on the engine/bodywork stating who actually made the trimmer for them.

Edit: Verdammt! Beaten by a minute. :lol:
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Unread postAuthor: Alster370 » Sun Aug 21, 2011 3:07 pm

Well I would like a pull start but I cant get that bloody coil spring back in the mechanism, so looks like il be ditching it. The engine is fairly easily to turn for 2/3 revolution but that 1/3 it is rather resistant, any thoughts?
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Unread postAuthor: ramses » Sun Aug 21, 2011 3:11 pm

Gippeto wrote:Those look to be parts of the directional clutch mechanism for the starter...shouldn't be needed if you're not using the starter...and best removed before they become projectiles when the engine starts.

Wickes is a hardware store in the UK?? Seems they re-badge items made elsewhere.

Might be a sticker or tag on the engine/bodywork stating who actually made the trimmer for them.

Edit: Verdammt! Beaten by a minute. :lol:


Make certain you remove the weights from the centrifugal clutch as well. Those make VERY nice projectiles. Don't ask how I know that.
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Unread postAuthor: Mr.Tallahassee » Sun Aug 21, 2011 3:16 pm

They(pull start engagement teeth) rarely become projectiles unless you were to cut away all the metal holding them in place or it rusted away. I have spun cheaper ones to some crazy high RPMs. That flywheel and all the parts on it should take at least 9,000 RPM.
EDIT: I have had the clutch "pads" in a clutched weed trimmer throw themselves through the wall of my shed, which is 1/2'' plywood, from 20 feet.
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Unread postAuthor: Alster370 » Sun Aug 21, 2011 3:24 pm

Im not really sure what to use it for either. At first I thought... hmm power an alternator for a cheap arc welder? But then when I learned it has maybe 1.5hp tops not 3hp, my heart sank :D
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Unread postAuthor: Technician1002 » Sun Aug 21, 2011 7:26 pm

Alster370 wrote:Well I would like a pull start but I cant get that bloody coil spring back in the mechanism, so looks like il be ditching it. The engine is fairly easily to turn for 2/3 revolution but that 1/3 it is rather resistant, any thoughts?


The resistance is simply the compression stroke of the engine. You will find that will go away if the spark plug is removed. This is normal and the engine will not run without the compression.
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Unread postAuthor: jrrdw » Sun Aug 21, 2011 7:38 pm

Starter dogs....Wow, 24cc's! Mind numbing power there :roll:
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