craftman chainsaw help needed

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  #1  
Old 05-18-06, 03:16 PM
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craftman chainsaw help needed

I have a craftsman chainsaw model 358-356242. It is a little difficult to start and then when it does start it surges for about 10 seconds and dies unless I pull the throttle wide open. Then it really surges. I have just now rebuilt the carb, changed the one and only gas line (no return line), put in a new gas filter and put in a new spark plug. Still doing the same thing. I have tried the throttle screw out 1 1/2 turns, the high screw out 1 1/2 turns and the low out at 3/4 turns and still surging and dying. I have also adjusted them all out and in 1/4 turn or so and still surging and then dying.

This one is just flat out hard to figure out. I have rebuilt many a carb on 2 cycle and 4 cycle and I sure it is rebuilt correctly.have not been able to figure this out.

Any suggestions as I am going nuts. Repair shop is out as they want $65 to go through it and I only paid $150 new.
 
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  #2  
Old 05-18-06, 03:27 PM
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Bob

Bradw:

You may have already checked this but a plugged exhaust on a two stroke will act like that. I saw it a few times on motorcycles.
They obviously have a different carb set up, but the engine designs are similar.

Hope this helps
 
  #3  
Old 05-18-06, 04:42 PM
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i have the same problem

My stuped 2-stage snowblower does this and it won't stop it will run rough on static settings then when i adjust the highspeed screw it will speed up hold the speed for about 3 seconds and than speed up slow down backfire and do it all over again the carb has been rebuilt and it started doing this after that i was told that it could be doing this because of weak spark (My unit and points and condensers its from the 70s) do a compression test and see what psi you get you want AT LEAST 90 PSI if any lower toss it and buy a new one there cheap cause if it has low compression than the engine needs new rings and a valve job and to refresh the engine (at lest on my snowblower) i was looking a $144 thats not counting if the points had to be replaced.


Originally Posted by bradw
I have a craftsman chainsaw model 358-356242. It is a little difficult to start and then when it does start it surges for about 10 seconds and dies unless I pull the throttle wide open. Then it really surges. I have just now rebuilt the carb, changed the one and only gas line (no return line), put in a new gas filter and put in a new spark plug. Still doing the same thing. I have tried the throttle screw out 1 1/2 turns, the high screw out 1 1/2 turns and the low out at 3/4 turns and still surging and dying. I have also adjusted them all out and in 1/4 turn or so and still surging and then dying.

This one is just flat out hard to figure out. I have rebuilt many a carb on 2 cycle and 4 cycle and I sure it is rebuilt correctly.have not been able to figure this out.

Any suggestions as I am going nuts. Repair shop is out as they want $65 to go through it and I only paid $150 new.
 
  #4  
Old 05-18-06, 05:22 PM
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i found the problem

The intake sleeve behind the carb was broken in two and allowed a tremendous amount of air to flood the carb. sears wants 15 dollars for it so i might try a piece of rubber hose from the local home depot. i'll follow up and let you know if this was it but more than likely it is.
 
  #5  
Old 05-20-06, 01:31 PM
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problem fixed

I found the problem. The intake sleeve has a rubber fitting on it and it was split allowing air into the cylinder. Sears wanted 15 dollars. I told them cya later and went to autozone where they gave me for free a one inch piece of rubber tubing that worked like a charm.

All is done now
 
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