I have a 2005 Dixie Chopper Flatlander with at least 3000hrs. on it, tiny tach went out and I never replaced it so not sure of exact no. of hrs. on it. Started running rough, so we pulled plugs, they looked equally good with no fouling. After running cleaner in the gas with no results we pulled the carb. Took the jets out and float off, blew carb cleaner throughout then soaked it overnite in dip. After all this, we had no change, it still runs rough. We checked compression and have 145# and 160# on the cylinders. What can be the problem here? Engine runs good under power with blades engaged but surges without a load on it, and idle is ragged.