I searched but did not find an answer to the following. Is there any reason with an 07 Ultra Classic that is stock that I need to get the Harley store plug vs. the Champion variety ??

 

Nope ... but Shooter is correct if you're concerned with the antiknock.

 

Simple answer: 2005 and later Harley-Davidson EFI systems incorporate an "Anti-knock" feature that operates by reading the current resistance through the spark plugs.
The use of any other spark plug other than 'Stock' (6R12) disables the anti-knock feature.

Source: https://www.hdforums.com/forum/fuel-...ml#post9359708

Your call

 

I run autolites in my 04 and the harley vrod plug in my 12 with a 120R

The 120r likes harley plugs better than others where the 04 it does not seem to affect performance

So i cough up the extra coin for HD plugs on the later model bike

 

I have had my bike with autolite 4164's and the champs installed at different times on the dyno and both kept the ion sensing feature working properly. Unless you have a way to check, it might be smart to use the stock plugs, if you are concerned.

 

They are 5 bucks a piece. Whats the benefit of using other plugs?

 

Autolites are about a $1.29 each.

For newer bikes its not a lot of coin To buy HD plugs.

My older bike performs better on non hd plugs. I assume thats because most of the internal parts in the engine are non HD.

 

I'll make this simple: Use the stock Harley plugs. Did I say use the stock Harley plugs? Yes, use the stock Harley plugs.

 

I hadn't ever heard of the anti-knock feature but since Champion makes the HD plugs - oresumably a Champion or other branded stock equivalent would work just as well.

 

'Just bought Champion RA8HCs for my bikes today...


Saving $3 per plug X 6 plugs, is a case of Coors Light...


No issues with ion.


Harley doesn't make plugs.