serial 1B044209....
long story short... friends were messing around on my boat a month or so ago having some drinks in the garage. motor got sent into break in mode.
Did the maiden season voyage this past weekend, these plugs don't have too much idle time on them 10 mins on muffs. then warm up times on water I always usually run around 3000+ rpm through out the day (no extended putting around) until I got to boat launch then I putted around for about 10 mins waiting for trailer to load boat up.
plug 5 has some major carbon built up on the ground strap from the exterior of the ground strap (near threads) to about half way up back of the strap, i've seen fouled plugs but to the point it had hard carbon build up on the back strap seems a little different to me? especially for plugs with at the most 10 hours on them. I got the boat late in the season last year and changed the plugs when i got it then...
1st part of the day I did manage to hit close to 5400rpm if I can recall (it hit 55MPH on the nose GPS that i know for sure) then at some point it went down to 5100 and would crawl to maybe 5150 rpm at best and only pull 50ish mph)
Motor has new belt, CCM reeds (blocks were lapped) new t stats last season. warm up temps hovered 150-149. running temps above 3000k rpm floated around 88F
Plugs are IZFR5G gaped to spec.
when i winterized the boat I did follow dons recommendations and did drop a touch of oil down each plug hole and fuel cocktail....
Now what raises the concern for me is the hard carbon build up on the ground strap and that the PREVIOUS years plugs 1 of the plugs had the same style of build up.
or is carbon build up in that sense somewhat common esp when a motor is back in break in mode? im assuming the variance in the plug darkness could vary as they all could of gotten a little bit more or less oil down the cyl when i winterized it... I know the previous plugs I changed out where all a consistent blackish color except the 5 and 6 being the worse ones.
Cyl 1 -
Cyl 2 -
Cyl 3 -
Cyl 4 -
Cyl 5 -
Cyl 6 -