Over the long 4th of July week I took the opportunity to change my plugs to see if i could get to the cause of my port motor running rich and consuming 10-15% more fuel than the Starboard engine. As you can see I'm glad i did. Not sure when they were last changed, but boy did they need it.
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On a scale of 1-10 i give this a 3 beer job and one busted knuckle. Before you do anything remove the inboard exhaust from the engines. This gives you total access and allows you to move around behind the engines. Below I've listed pics and links to the tools and replacement plugs. You will need to use all three lengths of the swivel socket. The boot puller was helpful on a few of the wires but not totally necessary. I decided to give the Champion plugs a try since everything I've read says the AC Delcos foul as fast if not faster than anything else. The Champions are a third of the cost and so far they seem to be working great. I may pull a couple in a few weeks to see, but i am pleased.
After the change I am burning the exact same amount of fuel across both engines and my WOT RPM are at Port 4750 and Starboard 4750. Before i could only get Port 4400 and Starboard 4550.
The only real tricky plug to get to is the port motor, port side aft most plug. Its tucked in behind the Cool fuel and your blind because of the waste tank. On the starboard motor its much easier to see since i had removed the exhaust tubes.
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Use these tools to make your life much easier:
Boot puller
http://www.amazon.com/gp/product/B0002STS4E/ref=oh_details_o07_s01_i00?ie=UTF8&psc=1
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Wobble sparkplug wrench
http://www.amazon.com/gp/product/B000NIEECO/ref=oh_details_o07_s02_i01?ie=UTF8&psc=1
![Image]()
And I changed to these much cheaper champion plugs from the AC Delco's
![Image]()
On a scale of 1-10 i give this a 3 beer job and one busted knuckle. Before you do anything remove the inboard exhaust from the engines. This gives you total access and allows you to move around behind the engines. Below I've listed pics and links to the tools and replacement plugs. You will need to use all three lengths of the swivel socket. The boot puller was helpful on a few of the wires but not totally necessary. I decided to give the Champion plugs a try since everything I've read says the AC Delcos foul as fast if not faster than anything else. The Champions are a third of the cost and so far they seem to be working great. I may pull a couple in a few weeks to see, but i am pleased.
After the change I am burning the exact same amount of fuel across both engines and my WOT RPM are at Port 4750 and Starboard 4750. Before i could only get Port 4400 and Starboard 4550.
The only real tricky plug to get to is the port motor, port side aft most plug. Its tucked in behind the Cool fuel and your blind because of the waste tank. On the starboard motor its much easier to see since i had removed the exhaust tubes.
Use these tools to make your life much easier:
Boot puller
http://www.amazon.com/gp/product/B0002STS4E/ref=oh_details_o07_s01_i00?ie=UTF8&psc=1
Wobble sparkplug wrench
http://www.amazon.com/gp/product/B000NIEECO/ref=oh_details_o07_s02_i01?ie=UTF8&psc=1
And I changed to these much cheaper champion plugs from the AC Delco's
