Backfire


  #1  
Old 04-24-11, 11:17 AM
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Backfire

I have an older Shindaiwa chain saw. When I try to start it, it backfires every fourth pull or so. Doesn't start. What would you check for that situation?
THANKS!
TomVZ
 
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Old 04-24-11, 12:20 PM
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Welcome to the forums! A highly likely scenario is a sheared, or partially sheared key on the crank shaft. It will change the timing just enough to back fire and not run well if at all. Could be rust on the flywheel magnets as well. Have you taken it down below the pull cord yet?
 
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Old 04-25-11, 05:22 AM
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Thanks chandler. No, I was hoping for something much easier! I usually don't go that far into machinery, as I'd likely make things worse. You can't think of anything simpler to check?
 
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Old 04-25-11, 12:58 PM
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Backfiring is typically a timing issue, and that's deeper than the fuel cap. It's not that difficult, but I understand if you don't want to go with full heart surgery. Sometimes it is better left to the lawnmower guy to do.
 
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Old 04-25-11, 06:54 PM
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Thanks Chandler. I'll call my small-engine guy.
 
  #6  
Old 04-26-11, 03:58 AM
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Hey, Tom, I have a Poulan 3400 countervibe bow saw. Simple to change the fuel line, right? I put it all back together and took it to my guy, too. Those lines ran in places where there were no places . Just glad he had the experience to do it.
 
 

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