Changed oil on Honda HRN lawnmower before the cutting season. When I start mower, a puff of white smoke always seems to come from exhaust. Can someone explain why?

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Posted by Geauxkart

Member since Jun 2013

109 posts

Posted on 8/3/25 at 3:11 pm to DRTiger67

Probably a little oil seeping past the piston rings when at rest. My mower does it as well. Never noticed significant consumption of oil though. I think you'll be fine.

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Posted by Clames

Member since Oct 2010

18930 posts

Posted on 8/3/25 at 4:25 pm to DRTiger67

May have over-filled a little, might be a leaking valve seal. GCV160 or GCV170?

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Posted by Spankum

Miss-sippi

Member since Jan 2007

60635 posts

Posted on 8/3/25 at 4:47 pm to DRTiger67

How old is the mower and how large is the property you are mowing?

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Posted by habz007

New Orleans

Member since Nov 2007

4840 posts

Posted on 8/3/25 at 7:06 pm to DRTiger67

Over filling can do it… I made that mistake once.

I changed oil and assumed I had put in same volume I took out. It was actually different size bottles. Idiot me.

White smoke engulfed the whole yard. Once I dumped some out, it went back to normal.

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Posted by DRTiger67

Member since Apr 2013

672 posts

Posted on 8/4/25 at 10:08 am to Clames

Think it's GVC 170, maybe I over filled it. Thanks and Geaux Tigers!

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Posted by Basinhunterfisher

Member since Feb 2018

782 posts

Posted on 8/4/25 at 11:30 am to DRTiger67

Run it till she blows

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Posted by calcotron

Member since Nov 2007

10122 posts

Posted on 8/4/25 at 1:45 pm to Basinhunterfisher

quote:
Run it till she blows

Maybe...I ran mine twice while smoking out the entire street and decided to let it be someone else's problem after that. This is after I had someone try 10 things to fix it and nothing helped.

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