Fine wire spark plugs

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ReelDrag

Petty Officer 2nd Class
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Jul 12, 2002
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143
Has anyone tried Denso Iridium fine wire plugs in their outboard? I read they were originally designed to prevent fouling in 2-cycle motors. Kind of pricey at $10 a piece. Anyone have any input?
 
OBJ

OBJ

Supreme Mariner
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Dec 27, 2002
Messages
10,161
Re: Fine wire spark plugs

Ain't never heard of them reeldrag but the fine wire core does make sence. The finer the wire, the more current capability the core will have....meaning less resistance to the amperage put out by the coil. Do you know of a web site they may have?
 
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rwise

Captain
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Jul 5, 2001
Messages
3,205
Re: Fine wire spark plugs

I used a plug like those in a Yamaha 400 dirt bike, kept burning a hole through the piston exactly under the plug! It was the factory recomanded plug too. Switch to a plug that my 250 used and the problem stop.<br />Just a thought, Richard
 
R

ReelDrag

Petty Officer 2nd Class
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Messages
143
Re: Fine wire spark plugs

I'm thinking about trying a set of these plugs but after what rwise said I'm not sure. Would it be possible to burn a piston just by using a different type of plug? I know my timing isn't over advanced and I just rebuilt the carbs, so it's not running lean. Maybe a little rich if anything. Any of you wrenches out there have any advice?
 
T

Terry H

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Sep 25, 2001
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Re: Fine wire spark plugs

ReelDrag..if'n you ain't got a problem why do you want to fix it? The factory setup is very good...just a Thought :cool:
 
R

ReelDrag

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Re: Fine wire spark plugs

I'm one of those people that just can't leave well enough alone. Always looking for that little extra.
 
M

Mettaree

Petty Officer 1st Class
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May 17, 2003
Messages
292
Re: Fine wire spark plugs

Don't they use fine wire plugs in Continental and Lycoming recip. aircraft engines ? If so, they must be fairly reliable to be passed by the FAA.<br />My .02 FWIW<br /> :)
 
R

ReelDrag

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Jul 12, 2002
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143
Re: Fine wire spark plugs

Yes, they do use them in aircraft engines. Trying to find someone that has used them in their outboard. Manufacturer claims quicker cold starts and less fouling. I rarely run wot and the Champions I use don't last very long.
 
R

rwise

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Re: Fine wire spark plugs

ReelDrag<br />Have you tried running with the plugs gapped an extra .05 to .10? I have read on the board here that this will stop help fouling.<br />Richard
 
rickdb1boat

rickdb1boat

Supreme Mariner
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Jan 23, 2002
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11,195
Re: Fine wire spark plugs

rwise is correct. A wider gap will allow it to burn hotter, reducing plug fouling. I gap mine at .040, as many other do. Give it a try before you jump into the wires. If it's fouling, there is a problem, other than wires, that needs to be corrected. I can troll my 70 Rude for hours with no fouling..
 
R

ReelDrag

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Re: Fine wire spark plugs

I've tried the wider gap. I get the best results with a NGK plug gapped at .035 in my V4. My problem is after trolling for an hr or more and I go to power up it will misfire for a few seconds , then clear up and run fine. Not a big problem, just annoying. Maybe i'm just expecting to much from a 12yr old 2-stroke.
 
B

BF

Lieutenant
Joined
Apr 8, 2003
Messages
1,489
Re: Fine wire spark plugs

hiya,<br /><br />If you're already using NGK plugs, they also have a "fine wire" electrode types... I've never tried 'em in a boat, but did use them in a snowmobile that kept fouling plugs with very good results. <br /><br />The last letter for NGK designates the electrode... for example, I used B9ES (regular) and B9EV (thin electrode, high tech $10 each plugs). **these are not the right numbers for your boat**<br /><br />If you're gapping wide to make them run hotter, have you thought about moving down one number in heat (that's what the number designates) eg. B8ES are same plug as listed above, but next step hotter. (higher numbers are cooler plugs)<br /><br />In my experience NGK plugs are way better than champions. I've never had an NGK plug go bad, but I've had champions be dead right out of the box on more than one occassion.<br /><br />HTH,<br /><br />Brent
 
rickdb1boat

rickdb1boat

Supreme Mariner
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Jan 23, 2002
Messages
11,195
Re: Fine wire spark plugs

Originally posted by ReelDrag:<br /> I've tried the wider gap. I get the best results with a NGK plug gapped at .035 in my V4. My problem is after trolling for an hr or more and I go to power up it will misfire for a few seconds , then clear up and run fine. Not a big problem, just annoying. Maybe i'm just expecting to much from a 12yr old 2-stroke.
Click to expand...
Sounds normal to me. If that's the extent of your problems, I would be content to live with that. Could be alot worse.. ;)
 
B

Bazooks

Cadet
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Apr 24, 2004
Messages
12
Re: Fine wire spark plugs

Guys, Stay away from Denso Iridium plugs. I race go carts and my team mate tried it, the top part flew right off the body (white area with green stripe). It has happened to a couple of drivers. If you want to use iridium plugs, there is one by NGK its called IRIWAY. It's blue, buy the Iriway9. There the best.
 
R

ReelDrag

Petty Officer 2nd Class
Joined
Jul 12, 2002
Messages
143
Re: Fine wire spark plugs

Well, I tried a set of the Denso iridium plugs and if they don't fly apart I'll never go back to the Champions. Instant starts even when cold, no more fouling, better throttle response. Motor has never run better. Also switched to Amsoil, don't know if that has anything to do with it or not.
 
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