Cylinder Re-Plating question

In article
<5f7f6fe2-7cb9-47d9-875a-e541fa9b86b9.DeleteThis@d4g2000prg.googlegroups.com>,
Tim H <tntharrell.DeleteThis@msn.com> wrote:

> I recently had the cylinder of my GasGas EC300 replated. When I
> received the cylinder back, I was quite suprised at how badly etched/
> pitted the gasket sealing surfaces of the cylinder were. The head,
> base, exhaust, and reed block surfaces are rough as hell, looking like
> they were heavily over sand-blasted, or like a really rough as-cast
> surface from a sand casting. Maybe I expected too much, but I thought
> surfaces like that would be masked for protection, or refinished, or
> something. As it is, I'm seriously concerned about the ability of
> these surfaces to seal when the motor is reassembled.
> Anybody have experience with replating cylinders? Did the sealing
> surfaces come back looking really rough, or like you'd expect sealing
> surfaces to appear?
>

I finally saw the photos on abpm. Any resolution to your re-plated
head?

I used the same company when I rebuilt the 125, and it's worked just
fine, strong as ever. The gasket surfaces look like they've been
painted with the same coating that's on the rest of the exterior of
the cylinder. I'll have to say that I wasn't really happy that they
routinely paint them, although it seems to have held up OK. I can't
remember for sure whether the YZ's cylinder had been painted on the
sealing surfaces like yours.

I think if I had to do it all over again, I'd just buy a new cylinder,
although that's probably not as easy a choice with a GG.

--
Charles
'99 YZ250

On Feb 18, 9:26 pm, HardWorkingDog <har....RemoveThis@mush.man> wrote:
> In article
> <5f7f6fe2-7cb9-47d9-875a-e541fa9b8....RemoveThis@d4g2000prg.googlegroups.com>,
>  Tim H <tntharr....RemoveThis@msn.com> wrote:
>
> > I recently had the cylinder of my GasGas EC300 replated. When I
> > received the cylinder back, I was quite suprised at how badly etched/
> > pitted the gasket sealing surfaces of the cylinder were. The head,
> > base, exhaust, and reed block surfaces are rough as hell, looking like
> > they were heavily over sand-blasted, or like a really rough as-cast
> > surface from a sand casting. Maybe I expected too much, but I thought
> > surfaces like that would be masked for protection, or refinished, or
> > something. As it is, I'm seriously concerned about the ability of
> > these surfaces to seal when the motor is reassembled.
> > Anybody have experience with replating cylinders? Did the sealing
> > surfaces come back looking really rough, or like you'd expect sealing
> > surfaces to appear?
>
> I finally saw the photos on abpm. Any resolution to your re-plated
> head?

Not yet, I haven't really had a chance to call and hash things out.

> I used the same company when I rebuilt the 125, and it's worked just
> fine, strong as ever. The gasket surfaces look like they've been
> painted with the same coating that's on the rest of the exterior of
> the cylinder. I'll have to say that I wasn't really happy that they
> routinely paint them, although it seems to have held up OK. I can't
> remember for sure whether the YZ's cylinder had been painted on the
> sealing surfaces like yours.

If only it were just paint.
Those surfaces are etched and pitted from the stripping process. Paint
I could deal with.
I don' think they put any paint on my cylinder at all, just very clean
bare aluminum.

> I think if I had to do it all over again, I'd just buy a new cylinder,
> although that's probably not as easy a choice with a GG.

At about $850, I wasn't really inclined to buy a new one...

Tim H