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[roadrunner]

I cant seem to find part numbers for the NGK Iridium plugs for my 103.  Would I still need stock replacement with new crank, gear cams, thundermax and Rhineharts duals?  Thanks all!

[AXIL]

  there is nothing special  about spark plugs on the street,  use stock,  any one tell you differant walk a way ..axil

[grc]

I cant seem to find part numbers for the NGK Iridium plugs for my 103.  Would I still need stock replacement with new crank, gear cams, thundermax and Rhineharts duals?  Thanks all!

The NGK number for the Iridium plug is DCPR7EIX for all Twin Cam engines.  Your modifications wouldn't cause a need to change the heat range.

Jerry

[roadrunner]

Thanks!

[grc]

You're welcome.  Btw, what Axil said is right, for all intents and purposes you will do just as well with the el cheapo stock plugs.  The platinums and iridiums are great for extended mileage (like 100,000 miles in your car), and the fine wire electrodes will reduce firing voltages which is great for a marginal ignition system, but for most of us they are overkill.  In my case, for instance, I pull the plugs when I winterize the bike so I can shoot a little fogging oil in the cylinders.  After I fire the bike the first time in the spring and blow the oil out, I install new plugs.  The high priced plugs would be wasted in my scenario.

Jerry