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Cylinder Scratches

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Simplicity_728
The cylinder in my 6hp Briggs has small scratches in it. They aren't deep but I would like to get rid of them anyone know? It's a Kool-Bore aluminum cylinder

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sammiefish
Im not sure what a Kool-Bore aluminum cyl is ... but... It is generally my understanding that you can not bore an aluminum cylinder... this is common in some 2 cycle engines.. aluminum cyl that is plated... these are not serviceable, unless you have it sleeved or re-plate it. this is the bonus to "cast iron sleeved" cylinders. they can be serviced.

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sammiefish
quote:
Originally posted by Willy
I would run a hone through it and see if they would burnish out. Unless they are deep I wouldn't worry to much about them.
+1here... hope you can simply hone and replace std rings... is there an underlying concern, like does it burn oil? you might just need a hone and new rings... beyond that I stick by what I said ... good luck ... keep us posted...

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Chris727
I don't know for sure, but the Briggs service manual does decribe boring aluminum cylinders oversized and does list a part# for their stones. I didn't see any reference to "Kool-Bore" in the cylinder section.

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xenon172
As far as I know Kool-Bore is the name they gave to their special alloy they use to make their engines. They say a standard hone should not be used but we have not any problems using one. Supposedly these engines can be re-bored as well.

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Simplicity_728
It smokes really bad on start up but otherwise it's fine. uses an about 1oz of oil per hour which briggs says is normal for the aluminum cylinder engines

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MPH
Back in the days of running 8hp Briggs on a 2kw winco generator I was told NOT to hone them as they have a 'glaze' on the cly walls to harden them. If this is removed the piston will cease up as soon as it gets warmed up good. If they are more rebuildable then a set of rings, which I did at least once to them all, I likely have half a doz engines I could rebuild. If I were you, I'd just put a new set of rings in it and call it good.

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sammiefish
quote:
Originally posted by MPH
If I were you, I'd just put a new set of rings in it and call it good.
++1 my guess is that the "glaze" you refer to is the plating... dont monkey around too much with an Al cyl...

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Simplicity_728
I took a piece of sand paper and got rid of the scratches and then polished the cylinder with a buffing wheel on the drill. Looks brand new and the compression is a little bit better. It still smokes on start up but it is gas smoke from being choked to start it.

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