Return to the Lawn Mowers Forum | Post a Follow-Up

 o
Weak spark

Posted by welderbytrade Mi (My Page) on
Sat, Oct 10, 09 at 17:49

I have a tecumseh 12.5 OHV the connecting rod was broke so I took it all apart to replace it everything went well until I tried to start it back up it is cranking fine but has a very weak spark .I replaced the magneto and still weak spark . Also if I remove the ground wire from the magneto it still has a weak spark any help would be appreciated


Follow-Up Postings:

 o
RE: Weak spark

To help us understand, what are you describing as a weak spark?

Sometimes, a spark may be almost invisible. Position the spark plug wire about 5/16 inch away from the cylinder head (use duct tape to hold it). A dark area such as a closed garage is a good place to perform this test. A nice pull on the starter usually results in about 500rpm. If the ignition system can deliver a spark with this test, the ignition system should be good.


 o
RE: Weak spark

Check to make sure the air gap is set correctly between the flywheel and ignition coil. Without a model and serial number I cant say for sure what the correct gap is, but it is normally around .010"-.012". Also make sure the coil is installed in the right direction, some have an arrow on the coil showing the direction of engine rotation.

weingartzparts.com


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Lawn Mowers Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here