Gashousegorilla
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- Joined
- Aug 9, 2015
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I was recently picked up a Craftsman DYT 4000 model #917.274641 with a B&S 18.5hp model #31P777-0348-E1. when I got it, I replaced the battery. It fired right up but was running rough and seemed to lack power at full throttle. After about 5 minutes of running, as I was mowing on an incline the engine backfired and shut off. I tried to restart it but no luck. I pushed it over to level ground and tried cranking it over for a couple of minutes. It would turn over fine but would backfire with every unsuccessful attempt. I have done the following troubleshooting with no luck. Replaced the plug and put on a brand new coil. Coil is gapped at .011 off the flywheel. Removed the flywheel and replaced the flywheel key. The old one was fine. Removed the head and checked for blown head gasket. Gasket was fine. Adjusted the valves to .005. Removed and cleaned the carb twice. I did cut the titter off on the anti backfire solenoid to eliminate that as a cause. The bowl fills with gas as it should. Adjusted the choke cable to ensure that was closing all the way. Engine cranks over nice and strong but doesn't seem to want to catch. After cranking it over for a awhile the plug seems to be wet. I do have spark but it's yellowish white. What am I missing?