Sears string trimmer

Reply

  #1  
Old 05-05-09, 06:39 PM
Member
Thread Starter
Join Date: Dec 2008
Location: SE PA
Posts: 120
Sears string trimmer

I have a model 358-797260 32cc two stroke trimmer that needs to have it's carb cleaned. It starts and runs but has the following issues:

The engine is a little bit down on power. It easily bogs down in moderately heavy grass but does not stop.

It takes six to seven pulls to start when cold, one or two if warm or hot.

It is just a touch slow to come up to full speed when not fully hot - meaning the choke is off but the engine has not been running for very long (under a minute or two).

After about 10 minutes of trimming, the engine will not return to idle. It is not running with a great deal of power because putting the string head into some grass / weeds will immediately slow the motor but taking the load off of the trimmer head causes it to speed back up considerably. Enough that the clutch is spinning the line and spinning it pretty fast.

Are all of the above symptoms likely to be corrected by cleaning the carb or should I look at something else when I take it apart?

Thanks
Steve
 
Sponsored Links
  #2  
Old 05-05-09, 07:21 PM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 16,820
It could be a carb problem, but it could also be an air leak into the crankcase. If you apply partial choke, does the engine performance improve?
 
  #3  
Old 05-10-09, 02:45 PM
Member
Thread Starter
Join Date: Dec 2008
Location: SE PA
Posts: 120
Sorry: days late update.

I went to use it today, and to test if half choke improved performance. But it would not start. So I proceeded to take it apart with the intention to clean the carb and see what else I might find.

It would start briefly with ether so I was confident that the issue was with the carb so I went ahead and removed it.

The carb, a walbro, was a little dirty inside but not too bad. There was a small screen which was about half clogged with some type of material that did not look like varnish. Maybe just junk flowing in from the tank? I cleaned it. What I did discover was the inlet for the fuel was plugged pretty good - say 80 to 90 percent obstructed. And, the fuel line running from the tank to the card was falling apart in my hand. So I have to buy a gasket kit and some fuel line. I do not have a means to soak the carb myself. Would liberal use of carb cleaner and compressed air be sufficent to clean it out? Keep in mind that it did not look very bad inside the carb at all. Only the inlet tube and the screen showed any sign of clogging. I saw no evidence of any varnish.

Steve
 
  #4  
Old 05-11-09, 11:07 PM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 16,820
I think you've found the problems, and spray cleaner will probably do fine.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes