Please note that the PICTURE UPLOAD function is not working. The iBoats Forum Moderators are working with the system administration folks at the parent company to get the issue resolved. This happened about a year ago and here we are again. In the meantime you can post photos as links to a picture hosting site of your choice. We are sorry about the inconvenience and will advise when the issue is resolved. Thank you for your patience.
The model number is 15R74S. I am trying to determine the proper spark plug gap. I bought the<br />motor from a dealer last year. The old plugs were Chapion L77JC4's. Sorry I am not sure of the year.
