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Mend Briggs & Stratton 3.5 Lawn Mower No Spark Engine

briggs + stratton 3.5 wont start-no spark?

i have fitted a new coil but still have no spark. i have removed the start cable and mechanism to eliminate it. i have turned it over with the pull cord and plug removed with ht lead held close to the head bolts

darren stringer
August 2009

Briggs & Stratton Briggs & Stratton 3.5 Garden Tools, Lawn Mowers Lawn Mower No Spark Engine

I recently had a customers mower in for repair that he had fitted a new coil on and couldn,t get a spark. Turned out he had trapped the kill wire between the engine and the coil so it was earthing out. I dont think for a minute you have done that but disconect the kill wire to rule out the coil being earthed out

mark tibbles
August 2009

the bolts are mainly zinc coated

darren
August 2009

Curious one, Darren...only thing I can think of - as the coil is new....are the head bolts painted, providing insulation? The spark only needs to jump the tiniest of gaps - 1mm is more than enough. Try looking for a spark again, with the machine in the dark.

John
August 2009

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Briggs & Stratton 3.5 No Spark - Fix?