I'm losing my mind trying to help a neighbor....
CH980-0016
Starts and runs what appears to be fine. When put under load it labors, smokes black and won't power the large conveyor it's on. Removing the air filter (more air) appears to fix it, but I believe it's still under powered.
Carb has been checked/cleaned, and needle and float replaced, air cleaner assembly was changed to the cylindrical type (because a twin machine with that style works fine), all with no change. Air filter is NEW. No fuel in oil. It appears to be running on both cylinders. Doesn't seem to be ignition, plus I haven't seen an ignition problem produce smoke like this.
This machine worked well for a couple of years before this started.
Look forward to your ideas.
BLES