Justin Button 0 #1 Posted April 24, 2016 I need plugs but unsure of the correct plug Share this post Link to post Share on other sites
djohn24 10 #2 Posted April 24, 2016 Hey Justin, I used Champion RS17YX in my 520H or you can use NGK TR5. Share this post Link to post Share on other sites
boomers_influence 106 #3 Posted April 24, 2016 justin you need to state WHICH model of onan engine you have. thank you boomer Share this post Link to post Share on other sites
