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Old 11-30-2012, 09:45 PM   #24
pommie john
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Joined: Apr 2008
Location: Brisvegas, Australia
Oddometer: 1,348
I tried iridium plugs in my Norton Commando race bike. On the dyno they showed about 1 horsepower improvement throughout the range.
However.. my drag racing guru friend reckons that if you get a gain from something like different plugs, there's a fair chance that your ignition system is the real problem. You might have a coil on the way out or other HT problem.
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