So I have 2004 225HP Optimax S/N-OT921915
I went to change the plugs today and pulled the bottom and middle-right side (looking from the back) plugs and they where NGK ILFR6G-E. *** These are 1/4" longer then the 4-correct plugs***
These where the first 2-plugs I pulled and I thought damn I got the wrong plugs.
Then I pulled rest and the other 4 plugs where NGK IZFR5G. Correct plugs
Can one of the Mercury Techs on here give me some info on this? I AM PRETTY CONFIDENT THAT ALL SERVICE WORK PRIOR TO ME BUYING IT WAS AT A MERCURY DEALER. Why would it have the 2-different plugs? I bought the boat 3 years ago FROM A FRIEND and have not used it much the last 2 years but when I did it ran great. This spring and summer I have had more time to fish and have been out at least 3 weekends a month since March. It was running great all year till 2-weeks ago when it would take forever to get on plane. Then It would run ok. It had no power to put it on the trailer either. I thought maybe it was loaded up and fouled a plug because I have been night fishing all summer-5MPH max at night here. So with all the idling I thought maybe I fouled a plug. They did not look fouled though. Thanks for any info.