stevebo-(Moderator) 8,083 #1 Posted June 30, 2009 guys, i have an onan 16 on one of my tractors and it smokes a grey/white puff when i throttle up. the plug is new and gapped at .025 and after running it less than 1 hour the plug is covered with black soot. i have a pretty good idea of the issue however wanted to see if anyone else could give me things to look for. I was speaking with bearpath and he gave me a few things to look for. any help would be appreciated. thanks- Share this post Link to post Share on other sites
nylyon-(Admin) 7,131 #2 Posted June 30, 2009 Steve, what plug are you running? The "book" calls for RS14YC, and I had the same problem. When I installed the original type which came with the machine new, RS17YX, no problem since. Share this post Link to post Share on other sites
stevebo-(Moderator) 8,083 #3 Posted June 30, 2009 Karl, I am running an autolite. What make is the one you mentioned? Share this post Link to post Share on other sites
nylyon-(Admin) 7,131 #4 Posted June 30, 2009 Champion, the OEM plug is "RS17YX" and it works the best. I think that I may have a thread somewhere here, I'll have to look. can't find it, but I can tell you I was not happy with the other plugs. Get a couple of RS17YX and give it a shot, Onan put those in for a reason? Share this post Link to post Share on other sites
stevebo-(Moderator) 8,083 #5 Posted June 30, 2009 Karl, Great info-thanks !!!I will try it tomorrow. Share this post Link to post Share on other sites
stevebo-(Moderator) 8,083 #6 Posted June 30, 2009 Karl, What should the gap be? Share this post Link to post Share on other sites
nylyon-(Admin) 7,131 #7 Posted June 30, 2009 I was having horrible problems, running on one cyl when starting etc.... cleaning out the carb, new fuel / air filter and the new plugs, runs like new again. Gap is .025 Share this post Link to post Share on other sites
WHC-125 4 #8 Posted June 30, 2009 Steve, make sure that motor has both pistons and connecting rods :thumbs2: Share this post Link to post Share on other sites
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