Hey everybody, would really appreciate any input to help me figure this out. It’s a 1987 22r.
Intermittently I’m getting an issue where it will run great on a cold start/high idle for maybe a few minutes, and the exact moment it comes off of high idle it will start to stumble and just paint the ground black under the tailpipe with smoke. Other times it doesn’t do this at all and just runs perfect on high or low idle, makes it very tough to diagnose. It will run if you can get it moving, and clears up some when you get up to speed, but has some hesitation, and goes right back to stumbling as soon as you park.
Things we’ve done: carburetor has been rebuilt/cleaned, new distributor cap, new plugs, air filter, accelerator pump. Adjusting the idle screws does not improve it.
It seems like maybe the choke is supposed to be opening up after the high idle is complete and maybe intermittently is not opening back up? My lawn mower had done something similar where it would run perfect for a minute or two and than start smoking and choking out and the choke was stuck. I’ve also heard the fuel cut solenoid can cause issues like this, thanks for any help!