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Lately my Stihl bg 61 av Leaf Blower is very hard to start. I put in a new spark plug; the fuel mixture is correct. It used to take four pulls to start and now it takes at least 10 pulls.

Posted by Anonymous on

5 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 61 Answers

SOURCE: NOT GETTING FIRE TO THE SPARK PLUGS for a leaf blower

bad coil, or bad off on switch.

Posted on Sep 06, 2009

nova2nv
  • 197 Answers

SOURCE: Simply need the fuel mixture

50 to 1.

Posted on Sep 07, 2010

  • 20 Answers

SOURCE: Stihl BG 75 blower doesn't

These units are very promt to gas fouling of spark plugs, try replacing plug. If you still have no spark then possibly the flywheel has a metal strip in it that is prone to rusting, especially if unit does not get used alot, can be cleaned up with 180 or 22 grit sandpaper. If this strip is rusted then coil cannot communicate & therefore you get no spark. Lastly if all above check out good then most likely you have a bad coil. If coil is to be replaced make sure to gap the coil away from flywheel by placing a peice of paper folded over between coil & metal strip-(magnet) coil will pull itself to strip, tighten bolts & remove paper, gap is set.

Posted on Nov 10, 2010

  • 110 Answers

SOURCE: I am getting no spark at plug. Briggs model 31c707

Hello, the next couple of things to check would be under the engine lid.

  1. Remove the screen over the air fan on the top of the fly wheel.
  2. Remove the 4 bolts securing the main lid and remove. Depending on the year of this engine it may have a secondary cover that Craftsman put on that will need to be removed first.
  3. When the lid is off you will see the magneto coil right above the spark plug; just follow the spark plug wire up to it.
  4. Use a wrench to see if the magnet on the fly wheel is strong. If the magnet is bad or really weak the flywheel will need to be replaced.
  5. Next check the magneto ground out wire. It will be a small black wire on the magneto. Unplug it then crank the engine. If the engine starts plug the wire back on the magneto and if it shuts down there is a short along the wire. It should only shut down or short out when the key is shut off. You will need to find the short if this is the problem.
  6. If the magnet is strong and the above test still fails to provide a spark then it is likely that the magneto is bad. You will need the rest of the model number; it will look something like: 31c707- # # # # - # # The part runs somewhere around $35.00 from Sears, but you might find it on-line cheaper.
  7. Replacing the magneto is pretty straight forward from there.
  8. Remove the old one and replace the old one adjusting it as far away from the flywheel as possible.
  9. Turn the flywheel until the magnet is directly across from the magneto.
  10. Put an ordinary business card between the magneto & the flywheel.
  11. Loosen the 2 screws that hold the magneto in place just enough for it to tighten up to hold the business card in place.
  12. Tighten the screws holding the magneto & rotate the flywheel to remove the business card.
  13. Test rotate the flywheel by hand a couple of full turns to ensure there is no contact with the magneto.
  14. Replace the small black wire, spark plug and spark plug wire, then test fire the engine.
  15. Shut the engine down and replace all the remaining parts in the reverse order as removed.
You should be good to go after this. If this was helpful please vote yes. Thank You!!

Posted on May 07, 2011

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