Re: cb750 popping/backfiring

Posted by sgtslag on May 14, 2013; 6:42pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/cb750-popping-backfiring-tp4040698p4040760.html

The Iridium plugs will fire almost instantly -- like having new, much more powerful coils installed!  Problem is that they are around $8 each...  If they foul, you buy a replacement.  Yes, they are worth the cost, if you have everything else in good working order.  In cars, they will last up to 100,000 miles; in a bike, they should last 50,000 miles, as long as they don't foul due to carb/engine issues.  I'd recommend 8's (regular temperature range), not 7's.  Cheers!