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Discussion Starter #1
I've been wondering if anyone has tried any of those fancy spark plugs in their strom that say they improve gas mileage. I've read about iridiums, but from what I can tell, they just last longer. I've seen adds for E3's or Bosch make plugs that are supposed to make bigger sparks.

I have an '05 Wee. Folks with newer, dual spark cylinders are generally reporting better mileage with their bikes, so I've been wondering if a better spark plug would make a difference in my mileage.

Keep in mind, though, that I haven't been ambitious enough to check to see if they make any of those plugs in the right size for stroms.

Any thoughts are appreciated
 

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stay away........ measurable mpg improvement isn't going to happen with magic spark plugs, special air intakes, magnets, fuel additives etc...

To get better mileage....
1. Keep your vehicle maintained and in spec
2. Control the throttle urge
3. ditch weight... top boxes not in use, excess gear,
4. walk
 

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FORUM GODFATHER.....R.I.P. PAT
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'07 Dual spark plug bikes get better mileage because they run leaner and don't make as much power as earlier bikes. The difference in either case isn't much. '08s are said to have gotten the power back, but if they did, it would be at the expense of better mileage. TANSTAAFL
 

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Changing plugs makes the bike feel better, but I noticed no mpg improvement. What did make an mpg improvement was adjusting the valves about 400 miles ago. All mine were on the tight side of spec (03 Vee) and I set the exhaust valves in the middle of spec, and based on the shims I could get, I set the intakes one thousandth losser than middle of spec. Runs a bit smoother by the seat of the pants, but definitely a noticeable mpg increase.
 

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Discussion Starter #5
Thanks for the info....but that begs the question...if dual spark plugs make no difference, what's the point? I don't see the logic in building a more complex system that doesn't get you anything.

Surely there has to be some benefit from having more spark in a cylinder.:bom_glasses:

hbonser: what plugs did you put in?
 

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I put Iridium plugs in my 03 Vee. Definitely spruced it up, better seat of the pants feeling. I don't know how long the stock plugs were in it, but I know the iridium will last a longer time before needing changing.

The reason for going to dual sparks (I think) is to get away with a leaner mixture and by igniting it in two places, it burns a bit quicker and cleaner. The "flame" has half the distance to travel before it meets the other "flame" ignited by the other plug. But a lean mixture is still a lean mixture so power won't be quite as good as a richer one, even though they may be close.

Hope that helps, any other ideas? I also thought that one plug could be firing sooner and the second plug is there to help clean up residual in the combustion chamber.
 

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The plugs are in series off the same coil. They have to fire simultaneously.
 

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stay away........ measurable mpg improvement isn't going to happen with magic spark plugs, special air intakes, magnets, fuel additives etc...
Don't tell me the Turdulator really doesn't work! Damn!
 
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