Re: CB 750 F DOHC.

Posted by sgtslag on Jan 29, 2014; 3:42pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/CB-750-F-DOHC-tp4047729p4048476.html

I put them in my '79 K model:  before, with regular plugs, I had to grind the starter for 5-7 seconds before it would catch; with the Iridium plugs, it started instantly -- I jumped the first time I hit the button as it came to life the moment the switch closed!  They made a tremendous difference in my Honda (known for weak OEM coils -- not enough voltage across the plug gap's to get a truly hot spark; modern coils put out such high voltage, that if you get hit, a trip to the ER, to have your heart rythm checked by an EEG, is required...).

I put them into my Voyager, based on the results achieved in my Honda, but the '93 Voyager has much better (higher voltage) coils, so no noticeable difference in performance.  Still, Iridium plugs are good for 100,000 miles in cars/trucks, so they should last at least 50,000 miles in bikes.  I will take that.  They also require less voltage to achieve a spark, which means they fire more consistently, than regular plugs -- fewer misfires, fewer emissions of un-burned gasoline (allegedly, they will improve mileage by a whopping 3%...).  If for no other reason, they will last a lonnnggg time (assuming no fouling).  Cheers!