N3PUY 1,031 #1 Posted June 15, 2016 Why is the spark plug in a different location on a 10 and 12 HP cylinder head? Share this post Link to post Share on other sites
ol550 830 #2 Posted June 15, 2016 Didn't the later models move the plug over the exhaust valve to reduce fouling? 2 Share this post Link to post Share on other sites
Hossenfeffa 49 #3 Posted June 16, 2016 Kohler revamped the flathead heads several times The spark plug was moved to the spot above the exhaust valve for more horse power and to reduce fouling on cold starts Share this post Link to post Share on other sites
N3PUY 1,031 #4 Posted June 17, 2016 Very good ...... I have two 12HP with the plug above the exh valve and a 10 &12 &14 with the plug between the valves. Share this post Link to post Share on other sites
