Losing Spark?!

[Vintage Engine Repairs]

Have you ever seen this before?

 

[SteveSr]

That shielded HT lead is there to prevent radio frequency interference. Probably an Aussie regulation. That is also why your tach doesn't work until you put your un-shielded spark tester inline with the plug.

 

[Vintage Engine Repairs]

That shielded HT lead is there to prevent radio frequency interference. Probably an Aussie regulation. That is also why your tach doesn't work until you put your un-shielded spark tester inline with the plug.

Thanks Steve, spot on, someone else mentioned it was for that purpose! Much appreciated.