Staffsargeant 4 #1 Posted July 11, 2021 Hello fellow WH owners, I have a 1996 WH 416. I am looking for the spark plug #. Thanks for the info. Share this post Link to post Share on other sites
953 nut 57,403 #2 Posted July 11, 2021 (edited) Champion HC-10 should do the trick. MY bad Edited July 12, 2021 by 953 nut 1 Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,205 #3 Posted July 11, 2021 1996 416-8 should be an Onan twin engine. HC-10 does not sound correct. Original plugs in the early P series Onan's was the Champion RS14YC. Crossed to NGK 2238/TR5. Onan changed over to the Champion RS17YX. Crossed to NGK TR4. Issues with plug fouling caused them to go with a hotter plug. NGK 3754/TR4 is the correct plug for Horse's with P216, P218 & P220 engines. The TR5 is ok if you run your horse under heavy loads all the time. If you run it light, heavy and everything in between, TR4 is the way to go. It's the all around plug. Attaching Onan Factory PSB concerning the issue. The gensets they refer to use the P218 and P224 engines, so info is applicable. From the "Horse's Mouth".....:) 1 1 Share this post Link to post Share on other sites
8ntruck 7,317 #4 Posted July 11, 2021 Do we have a manual on file for this model/engine? That information should be in the 'Manuals' section of the forum. Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,205 #5 Posted July 11, 2021 Service manual Early 1996 Wheel Horse operator manual shows RS14YC plug gapped at .025" Late 1996 Wheel Horse operator manual shows RS17YX plug gapped at .025" 1 Share this post Link to post Share on other sites
