Johnson 20hp

[samsix6]

hi guys, i'm new to the board and coming all the way from sunny Surrey in England, can anyone tell me the correct spark plugs for a 1975 20hp, NGK or Champ?? cheers

 

[Joe Reeves]

Re: Johnson 20hp

1975 20hp Johnson - Champion J4C or J6C plugs, gapped at .030.

The J6C may provide somewhat improved performance, try both.