Model #643A TROYBILT Rear Tine, Gas Tiller

  • Tine Hood/handlebar
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Question and Answers


I do not have any spark at plug. Plug is new. 917353774 Craftsman Sears 3.7 chain saw


Thanks for the inquiry and for using
If you've verified there is no spark emanating from the base of the plug while grounded out, I would suspect the ignition module or wire leads need to be checked for connectivity. If the leads look good, chances are that the module is defective. 
Unfortunately all the parts in question have since been discontinued and are no longer available for sale. The module is part number 3558J and the leads are 643A116 and 643A117. You could try running an online Google search for the part number(s) to see if they are still in circulation. That would be the only option I could foresee as there is no direct substitute for the discontinued parts. 
Hope this helps out and thanks for using 

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Jeff Wallace Sr -
Sears Technician
May 15, 2014

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