I would like to try using modern spark plugs. I have no more AC44FF plugs left and I was wondering what the most popular plugs are. I am running a stock ignition system on a 140. Thanks and Happy July 4th! --- Outgoing mail is certified Virus Free. That has to make you happy! Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.713 / Virus Database: 469 - Release Date: 7/1/2004