Advice needed using ignition spark tester

[Springbok142]

I've got a spark tester and would like to check the spark on my new to me '93 25 hp. In reading a few other posts it sounds like a spark that jumps a 7/16" gap is healthy. My question is how do I conduct teh spark test? Do I test one plug at a time while the motor is running on the other plug? I'm sure the procedure is pretty simple but I just want to be sure I don't burn out a coil or do any other damage.

Thanks!

 

[crxess]

Re: Advice needed using ignition spark tester

No, you simply bump electric start or pull rope start to rotate engine enough to fire on that wire.

 

[ken52]

Re: Advice needed using ignition spark tester

do you pull wires off the other plugs to keep motor from inadvertenly firing up?

 

[ezeke]

Re: Advice needed using ignition spark tester

Test for spark with all plugs removed. Be sure to get a good ground on your test device.

The idea is to have no load on the engine so that you maximize the spark.

You will probably not reach 7/16" on a rope start, but the spark should be snappy and blue in either case.

 

[ken52]

Re: Advice needed using ignition spark tester

Thanks ezeke, that does make sense.