70CC TO 85CC TO USE THE "8" AND 88CC TO 125+CC TO USE THE "9" THEY ARE THE SAME REACH AND DIAMETER AS THE STOCK NGK PLUGS LIKE THE C7HSA ... what one of our good customers said ........... Just an FYI..... I was running on the dyno this weekend and I ran with a standard ngk on my 88 kit then I ran your twin fire a few seconds later and got .3hp more.... I thought that was interresting.... Justin |