waffle 26 #1 Posted October 13, 2022 My 416 Kohler would backfire terrible when shut off.. Has 1400 hours so thought maybe this is the end. Would start and run great until shut off, so did the following one at a time....... Checked valve settings..... ignition module gap...... carb ok....took head off and looked great.... Compression 135psi when cold....... Was throwing me off as it would backfire if engine hot or cold which eliminated much of what it might be.... Then I read of the forum where somebody wrote it could be the key switch so looked at the wiring diagram and removed switch and sure enough, still making some connection instead of zero ohms across the tabs when key turned to off which would help provide a spark to make engine backfire. So...... carefully bent tabs on back of switch open enough to lift it out. Beadblasted the slide connectors to clean up and possibility of leakage from one connector to another, cleaned up the contact points on other side and put back together and bent tabs around switch back over. Checked all the points that manual said should be in start, run and off and they looked great. Problem solved at no cost too so maybe this will solve others with same issue........ So thanks for the help on the forum! 5 8 1 1 Share this post Link to post Share on other sites
ebinmaine 67,549 #2 Posted October 13, 2022 NIIIIICE work!!! 2 Share this post Link to post Share on other sites
Handy Don 12,232 #3 Posted October 13, 2022 1 hour ago, waffle said: So thanks for the help on the forum! Thanks for coming back and sharing your solution! 2 Share this post Link to post Share on other sites
Wheelhorse#1 1,666 #4 Posted October 20, 2022 Very good info.Could save someone from a lot of head scratching, heartache and swearing Share this post Link to post Share on other sites
