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 ?

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.

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!!

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.

Also would like more info here as I have a pooping at wot and hesitation like a mis going on motor has 75 hr,