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Old 08-06-2002, 11:52 PM
greenflag greenflag is offline
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Join Date: Aug 2000
Location: Burleson, Texas
Posts: 92
Smoke from briggs

I have an 8.5hp Briggs that will let out a good bit of white/blue smoke when started.

It only does this on occasion. For example today I started it & loaded it on the trailer, no smoke, when I started it at my first account (about 6 blocks away) it put out a big puff of smoke & then cleared up.

I had thought about water in the fuel but, I am using the same gas in my Kolher, without smoke.

The only change I have made is I started using synthetic oil.

Any ideas????
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Old 08-07-2002, 02:44 AM
Robert Doubrava's Avatar
Robert Doubrava Robert Doubrava is offline
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Join Date: Aug 2001
Location: Beeville, Texas
Posts: 342
I've got a 7hp B&S that smokes all the time. It starts on the first pull everytime. It smokes white heavily, then clears up a little, then smokes the whole time, because oil leaks past the piston, because the cylinder bore is worn out. Either it's the cylinder, or the rings, I think. Good luck!
My truck:

1970 Chevrolet C20

My equipment:

1984 22" Yazoo BigWheel 5hp B&S I/C
1993 38" Craftsman rider 12.5hp B&S I/C
2004 Craftsman 17" gas weed-wacker
2004 Craftsman gas blower
1982 Trim-All edger 2hp B&S
1990's Stihl 009L, 14" bar
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Old 08-07-2002, 05:58 AM
Richard Martin's Avatar
Richard Martin Richard Martin is offline
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Join Date: Mar 2000
Location: Greenville, NC
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Greenflag wrote:

The only change I have made is I started using synthetic oil.

It is not unusual for a small engine to release a small amount of smoke at startup. If it bothers you just switch back to conventional oil.

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Old 08-07-2002, 10:16 AM
sdwally sdwally is offline
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Join Date: May 2001
Location: San Diego, CA
Posts: 385
It can be oil that leaks by the piston rings, if the rings are worn. Most likely with the description given, it is that the valve guides are worn and seals(if equipped). Oil will travel via the valve stems and set in the ports. The oil in the exhaust port will slowly burn off once engine is started causing the smoke that you see.
Clay Walsten
Developed Regional Parks
City of San Diego

We enrich lives through quality parks and programs.
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Old 09-24-2002, 05:21 PM
Arnold Arnold is offline
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Join Date: Sep 2002
Location: Wyoming
Posts: 193
I have a Yardman mulching mower that has done the same thing sense it was new But it never burns enuff to notice on the dipstick so I don't worry about it.
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Old 10-02-2002, 06:48 AM
Bill Kapaun's Avatar
Bill Kapaun Bill Kapaun is offline
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Join Date: Oct 2001
Location: Albany, Orygun
Posts: 846
A puff of bluish-whitish smoke on start up usually indicates some oil has leaked past the valve guides while the engine sat for some period of time.
I would surmise the reaon you got the smoke on the 2nd start is that the synthetic takes more heat to burn then you generated just loading it on the trailer.
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