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Cant get engine to rev up under load on Craftsman WeedEater

#1

M

MOmilkman

Hi guys,
Ive had a problem with my weed eater for some time now and I can not stand it anymore. Its driving me crazy and I have to get it fixed.
The model is Craftsman 358.791070 - 32cc 2 cycle Weedeater

It will idle fine, no problems there. But when you give it a gas to try to rev it up to trim something it will immediately try to die (or will die). Gas is only about 2 months old. (manual says use gas no older than 30 days but I call BS on that)

Under the troubleshooting section of the manual it says-

Trouble
Engine will not accelerate, lacks power, or dies under a load

Cause
1 Air Filter Dirty
2 Spark Plug fouled
3 Carb requires adjustment
4 Carbon buildup on muffler screen
5 Compression low

I dont believe it is 1, 2 or 4. All those have been checked or replaced since problem started.

I dont think its 5 but not 100% sure.

I think its 3 but not sure what to adjust.

In the picture you can see the carb on the weedeater. I know the one screw (largest one at bottom) is the idle screw. Other than that no idea.

Can anyone help?

Thank you

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#2

exotion

exotion

MOmilkman said:
Hi guys,
Ive had a problem with my weed eater for some time now and I can not stand it anymore. Its driving me crazy and I have to get it fixed.
The model is Craftsman 358.791070 - 32cc 2 cycle Weedeater

It will idle fine, no problems there. But when you give it a gas to try to rev it up to trim something it will immediately try to die (or will die). Gas is only about 2 months old. (manual says use gas no older than 30 days but I call BS on that)

Under the troubleshooting section of the manual it says-

Trouble
Engine will not accelerate, lacks power, or dies under a load

Cause
1 Air Filter Dirty
2 Spark Plug fouled
3 Carb requires adjustment
4 Carbon buildup on muffler screen
5 Compression low

I dont believe it is 1, 2 or 4. All those have been checked or replaced since problem started.

I dont think its 5 but not 100% sure.

I think its 3 but not sure what to adjust.

In the picture you can see the carb on the weedeater. I know the one screw (largest one at bottom) is the idle screw. Other than that no idea.

Can anyone help?

Thank you
Click to expand...

Buy a new carb. Or a new weedeater....


#3

impalass

impalass

MOmilkman said:
Hi guys,
Ive had a problem with my weed eater for some time now and I can not stand it anymore. Its driving me crazy and I have to get it fixed.
The model is Craftsman 358.791070 - 32cc 2 cycle Weedeater

It will idle fine, no problems there. But when you give it a gas to try to rev it up to trim something it will immediately try to die (or will die). Gas is only about 2 months old. (manual says use gas no older than 30 days but I call BS on that)

Under the troubleshooting section of the manual it says-

Trouble
Engine will not accelerate, lacks power, or dies under a load

Cause
1 Air Filter Dirty
2 Spark Plug fouled
3 Carb requires adjustment
4 Carbon buildup on muffler screen
5 Compression low

I dont believe it is 1, 2 or 4. All those have been checked or replaced since problem started.

I dont think its 5 but not 100% sure.

I think its 3 but not sure what to adjust.

In the picture you can see the carb on the weedeater. I know the one screw (largest one at bottom) is the idle screw. Other than that no idea.

Can anyone help?

Thank you
Click to expand...
You need to buy a special screwdriver to adjust the mixture screws.
Mine takes the 'Pac Man' type, so-called because the needle valve head is just round with a pie-shaped chunk out of it. After receiving the tool, I had the thing straightened out in two minutes.
After getting it started, use it until it's completely warmed up. I use mine with a blower attachment which is why I'm using it in the fall/winter. Leave it idling and put the tool on the LH valve, or Lo-speed, and turn it left to enrich the the start/idle circuit. Turn it until the engine speeds up and then begins to slow down. Now give it full throttle and do the same to the Hi-speed side. Open it up until it begins to '4-cycle' then close it a little to get your top end back.


#4

M

MOmilkman

Thx impalass. I'll have to look into buying that special screwdriver. I noticed those two adjustment screws at the top in the picture and wondered if that played into it. I'll let you know it turns out


#5

M

motoman

MO, search in this forum for the diy and adjustment of your machine. Look for "trimmer speed and spark tool" I have a 31 cc unit about 6 mos old and both lo and high speed circuits required adjustment. Save yourself $25.


#6

M

MOmilkman

motoman said:
MO, search in this forum for the diy and adjustment of your machine. Look for "trimmer speed and spark tool" I have a 31 cc unit about 6 mos old and both lo and high speed circuits required adjustment. Save yourself $25.
Click to expand...

Thanks motoman! Will do!


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