sparkplugs

2003 Bowrider, seawater cooled, single point drain. I used a magnetic plug socket that was $9.00 on Ebay. Took the day but was less difficult than I feared. 4 wood screws on port side hold wood bulkhead. Good access behind it but front two plugs were blocked by 1" coolant hose which came off...

So I'm asking for advice to see if I may have done something incorrectly or overlooked something...though I know where to begin. Always helpful to bounce ideas off of all of you! At the end of last season, my starboard engine was having a hard time starting. So before I ran it this season, I...