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Old 22 October 2012, 14:32   #11
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Wire brushing them isn't a good idea. Metallic deposits on the insulator ceramic wont help the insulation properties at all
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Old 22 October 2012, 14:36   #12
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I will replace them again as i have wire brushed them
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Old 22 October 2012, 15:31   #13
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Originally Posted by Jason calleja View Post
No i donít have a video of it and yes all plugs are the same and i donít think there is any problem with the injectors as it is still a brand new motor with 25hrs on it and fuel line was replaced new 6 weeks ago with all new filters including water filter separator too.
I have also added quick store to the fuel. Could it be the fuel treatment that causing it?
I don't think you have a misfire. Its possible the timing is a bit off, I believe that's on the 25hr service checklist.
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Old 22 October 2012, 15:56   #14
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When working for a merc dealer we had a 60hp 4 stroke come in with 5 hours on it .The customer was complaining of a slight misfire now and then couldn't find the fault in test tank. So took the boat an a sea trailI lifted the cowl to see if any water was splashing about and got a bolt off one of the ht cables. Fault found number 3 ht cable had a few strands of wire poking out the ht cap faulty from the factory replaced under warranty all was good
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Old 22 October 2012, 16:40   #15
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Make sure you fit the champion ones they dont like running on anything else.
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Old 22 October 2012, 16:49   #16
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Does the engine run normally under load? That would be something to check. Also drain the vapour separator (fuel bowl) and check there's no dirt or water in there.
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Old 22 October 2012, 17:15   #17
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Originally Posted by Turbodiesel
Make sure you fit the champion ones they dont like running on anything else.
If I remember turbodiesel u can't fit ngk equivalent as the hex shape (nut) on the plugs are to big the fit in the cylinder head. I may be wrong
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Old 22 October 2012, 18:21   #18
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Why where the plugs replaced at 20 hours? Those plugs should be good for over 500+ hours.

The black around the outside edge is not what you look at. Instead it is the white-ish ceramic part that tells the story. With yours they are a light brown. Do you idle a lot? Do you run your boat hard sometimes? If you want to clean everything out open it up! During the break in period a little oil burn will happen causing the outside of the plug to get a black ring quickly.

As asked above how does it run just off idle and at higher engine speeds both under load and by raising the rpm's in neutral?
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Old 22 October 2012, 19:00   #19
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If I remember turbodiesel u can't fit ngk equivalent as the hex shape (nut) on the plugs are to big the fit in the cylinder head. I may be wrong
Fitted NGKs to mine a couple of months ago and it runs very nicely.
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Old 23 October 2012, 05:56   #20
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I replaced the plugs at the first 20hrs as it is an obligation by the warranty and i run it a lot at high speed and sometimes even at wot
And as i use it in salt water i let it idle in a fresh water tank for a 15min normally and when out of season i start it every 15days in the water tank too. Under load it works perfect.
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