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Old February 22nd, 2016, 12:23 AM   #20
Mohawk
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Name: Chris
Location: Bristol, UK
Join Date: Feb 2016

Motorcycle(s): ZZR250, VFR800

Posts: 475
FYI the resistance of external coils is 3ohm, the CoP's are 1.5ohm, I worried about this when I fitted CoP's to my 800 4 years & a good few thousand miles ago. So I tested a CoP in place after a long run, the CoP is inside the plug tunnel so does not get cooled & they are designed to run like that. I got 2.5ohm resistance whilst hot after the few minutes it took me to get access ! No CDI or ECU damage.

Head access was my main reason for doing this & I'll be fitting a big bore 282cc later in the year.
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