Better performance in every way and they last practically forever.

200.000 miles in my Nissan and sold it with them still in.

2 years in my FXDWG and never looked at them, if the bike hadn't got written off I dare say they would have lasted 10 years.

 

NGK for all the bikes, AC delco for the vehicles. Champion plugs are garbage.

 

brainfart!

you're correct. E3.34 is correct. editing my previous post now so no one gets confused

 

Thanks Spanners

 

This is a very useful site.....works best if you sort by engine size.

http://www.ngksparkplugs.com/part_fi...es/default.asp

 

Autolite copper # 4164, They work good, last long and cost little. You won't see any real increase in power by just changing plug types on a fairly stock engine.

Ds

 

my bike came with Champion RN12YC and ill stick with them. never had any problems.

 

We've used nothing but NGK BPR5ES-11's here for years.
We've also back/back tested plugs here on our dyno.
Yet to see anthing that would need for us to sell anything other than the NGK's.
Scott