snowhound 106 #1 Posted August 11 When i start my 417 it runs nice and smooth for about 15 seconds then it starts running rough and puts out black smoke. I tried turning the adjusting screws on the carburetor in but it didn't help. It had been running fine, Share this post Link to post Share on other sites
pfrederi 18,968 #2 Posted August 11 Check for spark on both cylinders. Could a bad plug on one... 1 Share this post Link to post Share on other sites
wfrpalm 218 #3 Posted August 11 Check the air filter. Share this post Link to post Share on other sites
snowhound 106 #4 Posted August 12 Spark plugs are good and I've tried running it with the air filter off Share this post Link to post Share on other sites
lynnmor 8,076 #5 Posted August 12 Remove the carburetor, disassemble and clean it thoroughly. Replace any questionable parts and gaskets. Adjust per the manual, you do have a manual? See the manuals section for the engine and tractor information. Replace the fuel lines and fuel filter so you don't foul the newly cleaned carburetor. Share this post Link to post Share on other sites
pfrederi 18,968 #6 Posted August 12 2 hours ago, snowhound said: Spark plugs are good and I've tried running it with the air filter off if you tested them by laying them on the block that is not decisive neither is the Harbor Freight tester. Some plugs will not fire under compression. Share this post Link to post Share on other sites
