496 MAG HO spark plugs

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09-29-2011, 10:13 AM

#11

paul buckner

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Quote:

Originally Posted by BUP

Yes U can run NGK stock # 7164 plug type TR55IX I use them also. Also NGK rep told me that they make some of AC Delco plugs and of course stamp them AC Delco.

Straight from Merc. Service Bulletin AC 41-983 and is listed in their Service manual.

http://ww2.justanswer.com/uploads/RO...2519_SPARK.pdf

OR just google this. Mercruiser Service Bulletin 2006-03

Link works now Fixed.

Read the link . confused ,which plug / 41-983 or 41-993 tried to find some ngk TR55ix and ngk supplers here in the uk cant even find the # listed here ?

09-29-2011, 03:28 PM

#12

JustMercMe

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Thanks for the replies guys....Found some of the NGK's local and went with those.
Thanks for the gapping tip also Ray. I'm hoping all i have is a fouled or bad plug. Started acting like I got a hold of some bad gas or had some water (would clear up once the motor would build heat or run through a lil bit of fuel) Now its just a soild miss and does'nt clear up.

Thanks again guys.

04-17-2014, 02:56 PM

#13

RAGE496HO

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Old thread but what are the benifits of the .050 gap versus the .060 that mercruiser recommends?

04-17-2014, 07:47 PM

#14

Ryan00TJ

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Quote:

Originally Posted by RAGE496HO

Old thread but what are the benifits of the .050 gap versus the .060 that mercruiser recommends?

Would like to know also... New 496 HO owner!!

04-18-2014, 07:59 AM

#15

mittens

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My boat had 75 hours out of 160 total hours, and they felt a little notchy when throttling, and where not even at the sticks for rpms...

swapped new plugs, and both motors came alive, even at the sticks/tacks too. really helped the boat. 7 bucks a peace is what i paid.