A little smoke would likely be just a bit of oil in the cylinder. Provided it clears up within a few minutes, probably nothing to worry about.I just bought a Honda...specifically a Honda 21 in. Steel Deck Smart Drive Variable Speed Self-Propelled Gas Mower.
I assembled it and filled it with the provided oil and it started on the first pull. There was some really mild puttering that resolved quickly anfter a few seconds of just running the engine. Then I noticed some white smoke coming from the front, at which point I released the throttle. After a few minutes, I started the mower again...and it backfired! It still started...and ran without any puttering, but I was a little concerned. There seemed to be less of the white smoke and I just let ir run for a minute or so.
My question is...anyone else have this issue of white smoke and a backfire after assembling and starting the mower for the first time? My assumption is that some of the oil leaked over into the manifold and will burn off...but I really have no idea.
Thanks for the help!
FYI, there is a hose that connects the crankcase to the air cleaner. If the mower is tipped on its side the wrong way (right side wheels UP) then engine oil can drain into the air cleaner and be ingested into the engine, producing smoke or even fouling the spark plug.
You may wish to inspect the air filter and cleaner housing for oil if the problem continues. Full details in the manual on how to do this.