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Old 10-04-2012, 01:15 PM
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Default not an easy fix : optimax spark plug fouling

What is the best way to keep plugs from fouling on a 2002 225 optimax....I have no mechanical problems and have completed all updates....my problem is I do alot of daytime swording where I am at an idle for long periods of time.

What I have done....so we dont have to repeat ideas I have allready done.

Run Iridium NGK plugs mer recommends
T-stats and housings updated to 130 degree
Run Quick clean with all fill ups
Run only DFI merc oil
Run the engines wide open after long idles "to blow them out"
im not over propped
All coils wires are in working order
fuel and air rail pressures where they should be
Compression approx 105 all the way around
not blowing smoke
800 hrs on motors....

Its not always the same plug / cylinder that fouls...If had plugs foul after just putting them in and idling then next day for 8 hrs....I have 3 engines...gets expensive

I though about hotter plug....but they dont make one....im at wits end and looking for ideas and suggestions
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Old 10-04-2012, 01:47 PM
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Quick clean worked for me when I ran an Omax, but I see you have tried that.
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Old 10-04-2012, 01:51 PM
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Were you doing alot of idling? were you using it at the recommended amount or doubling up....??
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Old 10-04-2012, 01:57 PM
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How much idling is a lot? If you have three engines can't you shut two of them off and alternate them?
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Old 10-04-2012, 02:21 PM
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I've got the same engine. I idle 10-12 hours a day and have never has any issues with fouling. You might check to see that the motor has not accidentally been switched into "break in" mode and is double oiling.
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Old 10-04-2012, 02:48 PM
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Quote:
Originally Posted by tomulrich View Post
Were you doing alot of idling? were you using it at the recommended amount or doubling up....??
Mostly idling, fishing pots. Not quite double, but more than the label suggested.
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Old 10-04-2012, 02:52 PM
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In the old day you went to a hotter spark plug to keep 2 stroke classic from fouling plug. The OManual even told you which plugs to get. Maybe mfgr can help with a solution based on your type of use..
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Old 10-04-2012, 03:14 PM
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All 3 engines foul random plugs consistently?
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Old 10-04-2012, 03:28 PM
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You are gonna have to bite the bullet and buy opti oil. When I had mine it was around $50-60/gal. But is cheaper then buy n them expensive plugs
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Old 10-04-2012, 03:49 PM
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You are gonna have to bite the bullet and buy opti oil. When I had mine it was around $50-60/gal. But is cheaper then buy n them expensive plugs
I used nothing but Pennzoil in mine.
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Old 10-04-2012, 04:04 PM
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Quicksilver premium plus- $20 a gallon from my repair shop if you bring a old QPP jug, $25 if you need a jug.

Clean, no soot/carbon on the hub.
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Old 10-04-2012, 04:18 PM
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We had a set of '99 225 opti's that were the same way. Never figured out why. We kept two sets of plugs and when I pulled and replaced a fouled one I would clean, regap and put that plug back in rotation. It's not a solution but if you're replacing with new every time I wanted to let you know that you could clean, gap and reuse. Also you can get the plugs a lot cheaper ordering through advance auto than through a marine retailer from what I found. We did everything you've done and never figured it out.
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Old 10-04-2012, 04:37 PM
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I have twin 300xs's and never had that issue. I use 93 octane, startron, quickleen and Premium plus oil only. New plugs every 50 to 100 hours and they are usually clean but I replace them anyways.
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Old 10-04-2012, 04:55 PM
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Quote:
Originally Posted by Pipo6007 View Post
I have twin 300xs's and never had that issue. I use 93 octane, startron, quickleen and Premium plus oil only. New plugs every 50 to 100 hours and they are usually clean but I replace them anyways.
Start sending me your old ones
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Old 10-04-2012, 04:56 PM
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Quote:
Originally Posted by tomulrich View Post
What is the best way to keep plugs from fouling on a 2002 225 optimax....I have no mechanical problems and have completed all updates....my problem is I do alot of daytime swording where I am at an idle for long periods of time.

What I have done....so we dont have to repeat ideas I have allready done.

Run Iridium NGK plugs mer recommends
T-stats and housings updated to 130 degree
Run Quick clean with all fill ups
Run only DFI merc oil
Run the engines wide open after long idles "to blow them out"
im not over propped
All coils wires are in working order
fuel and air rail pressures where they should be
Compression approx 105 all the way around
not blowing smoke
800 hrs on motors....

Its not always the same plug / cylinder that fouls...If had plugs foul after just putting them in and idling then next day for 8 hrs....I have 3 engines...gets expensive

I though about hotter plug....but they dont make one....im at wits end and looking for ideas and suggestions
Seems like a perfect reason to use a smaller kicker motor.Probably pay for itself pretty quickly just in fuel savings.
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Old 10-04-2012, 06:39 PM
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Switch to Pennzoil Premium Plus or XLF and be happy.
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Old 10-04-2012, 06:54 PM
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How do your reeds look? Check throttle plate gap at idle. Are t-stats working properly, motor gets up to temp? I have 300x motors and had fouling problems, adjusted my throttle plate gap to .024 at idle, problem gone. Out of spec tps, map sensors or bad intake temp sensor can cause problems too.
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Old 10-05-2012, 04:43 AM
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Thanks for all the replays. I usually idle for approx 12 hrs and yes I do alternate motors and do have random plug fouling on all motors. It seems it all happens at once.....rpm will be down. DDT will show at least one fouled plug on each motor with drop test....replce and rpm is back up. I will double check on break in mode..dont think im in it....but worth looking.

As far as oil....I always run DFI...thought it was the best.....I get it cheap......but penzoil is better? Amsoil....I want the cleanest burning oil with best protection....not worried about cost....withn reason

Something has to change....maybe it is the oil

Checked reeds yesterday..all good....also Throttle blade not adjustable....but it is in spect according to merc manual

Thnaks for advice..guys

tom
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Old 10-05-2012, 06:39 AM
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Merc DFI oil, Merc Premium Plus, and Yamalube all are very sooty oils. If you like at you prop hubs you will see they are both all sooty. Switch to Pennzoil and that will go away. Its a VERY clean burning oil. You can always go back but a LOT of us with Optis have made the switch.
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Old 10-05-2012, 11:50 AM
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Made the switch from yamalube to penzoil and the change has been night and day. After cleaning the prop there was very little carbon on it after 6 months of running. X2 on penzoil
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