Not a problem.
'R' plugs are important in systems that have intricate control boxes or onboard computer systems. The 'r' is for a 'resistor' that is part of the plug. That resistor prevents the collapse of the hi voltage field in the wiring when the plug gap breaks down (sparks).
That collapsing field in a non-r plug radiates some electrical 'noise' that can hose-eh-vu some electronics.
Some will insist that 'r' plugs give you a hotter spark. You might find these same riders using splitfire plugs cuz they are so good.
If you believe the latter, certainly insist on the former!!
Run a B8EG, anyway....or a 'V' series if you don't mind the couple extra bucks. The 'G' series plug (fine wire) is superior to the standard size 'S' electrode.
You can feel the difference, for one. And you'll have less problems with fouling.....if your bike has a tendency toward that in the first place. Which it does if you haven't rejetted.
I run non-r plugs. Also always ride with a radio (motorola talkabout). My bike interferes not a whit with the radio. Doesn't interfere with my cell phone either.
Don't worry about it.
***edit***
From the NGK website:
http://www.ngksparkplugs.com/techinfo/spark_plugs/faq/faqresistor.asp
NGK strongly recommends using resistor spark plugs in any vehicle that uses on-board computer systems to monitor or control engine performance. This is because resistor spark plugs reduce electromagnetic interference with on-board electronics.
