Correct spark plugs?

[Charlie T]

I have a 1992 Mariner 100HP in-line 4cyl. This motor idles on 2 cylinders then switches to 4 around 1800 rpms. I need to change the plugs. It has some NGK BP8HS-10 plugs in it now. Should I go back with those or is there a better plug to run?

 

[sprinkler]

Re: Correct spark plugs?

When I sent an email to the mfg for my 1988 100HP 4cyl, I got the following response:<br /><br />Hello,<br /><br />The BP8H-N-10 stock number 4838 is the recommended spark plug for your<br />application. This is the superceded spark plug. Gap should be set at .040.<br /><br />Jon MacQuarrie<br />Technical Support Specialist<br /><br /><br />-----Original Message-----<br />From: <br />Sent: Saturday, February 07, 2004 9:00 PM<br />To: NGK Form<br />Subject: NGK Form Mail<br /><br /><br />**** Contact Form & Tech Info Feedback ****<br /><br />Email From: <br />VehicleType: Outboard<br />Make: Mercury<br />Model: 100<br />Year: 1988<br />Engine Type: 4 cyl<br />Comments: My 100hp 1988 Mercury outboard engine came with NGK BUHW spark<br />plugs. These plugs cannot be gapped. Yet when I look up the appropriate<br />spark plug for my engine on your website, it lists BP8H-N-10 as the spark<br />plug for my engine. This spark plug can be gapped. Which one should I use?<br />(A service manual I have lists BUHW.)<br />When: 2/7/2004 9:00:02 PM<br /><br />END OF REPORT