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[easttnrhino]

put E3 plugs in 2011 110 motor ran like crap milage went from 40mpg to 33mpg put old plugs back in. maybe some one has had good results.

[grc]

put E3 plugs in 2011 110 motor ran like crap milage went from 40mpg to 33mpg put old plugs back in. maybe some one has had good results.

Just another gimmick, like many other gimmicks in the spark plug business.  Whenever you see an elaborate advertisement filled with supposedly scientific jargon that's really just smoke, your BS detector should go off.  There is no magic spark plug that will do the stuff those ads claim.

Stick with conventional plugs, either the standard Harley plugs or one of the Iridium or Platinum plugs if you want something that will last about 50k miles. 

Jerry

[ultraswede]

Yes I agree with the above.

One really great thing about the EPA stuff/regs,
is that we can be sure of that a Bike/car manufacturer has left nothing on the table as far as combustion efficiency is concerned.
(that can be fixed with a "wonder plug")

If it was as easy as getting a different plug to increase the combustion efficiency = lower emissions, it would have been done.
Plugs are cheap!

[Fatboy]

I ran them in both bikes last year and they worked fine for me, never had an issue.  a stall or a sputter.

They worked functioned flawlessly so much so that I now have them in my snow thrower and lawn tractor too.

[mjb765]

I tried them last year...while I did not see some magical improvement, my mileage did not drop as the OP's did.

[skratch]

a buddy of mine put them in his street glide.  he began experiencing problems with his engine running.  he would not be able to rev above 3000 rpm.  after tearing the top end down, he found that his oil pump gear had broken in half and one of the electrodes on the spark plug was missing.  coincidence?  maybe, but not one i'm willing to chance.

i'm not usually one to spout off with 'hd branded' stuff, but i do know that the ecm looks for the resistance value of the stock plugs in order to turn on the knock detector function.  if the resistance is not correct, then that function doesn't work.  but, there is no specification easily found for that value, and/or whether other plugs are 'close enough' to that value for it to work also.  at 25,000 mile change intervals, i figure i'll spend the couple extra bucks for the hd plugs (long ways from those carbed days on my sporty where i would change them out every oil change )