2056 smoke

I have a 2056. It smokes well in neutral, but does not puf well while running. Any quick way to fix. It still has the original unit in.
Thanks
TOm

Remove it from engine. Remove piston from bottom of unit, clean out hole where piston pushes air through upper part of smoke unit [seen by looking inside where piston travels], reinstall and be sure that linkage is pushing piston up and down [be sure piston is dropping back down too]. Let us know.