The garage clear out continues apace and long forgotten items have
resurfaced from beneath the work bench.

An original 1979 SWM 250 MX silencer. If I can loosen the re-packing
screws I reckon that is definitely worth a 99p listing on Ebay.

A Gilera Nordwest standard piston which IIRC came along with the
Nordwest engined Saturno when I bought it. Used, but looks in remarkably
good nick. I was just about to sling it in the 'metal' box for taking to
the tip when I did an Ebay search for used piston. A surprising number
listed, mainly for SO brit stuff.

I doubt there is any problem sourcing a new Nordwest piston from Uncle
Bob Wright, but it seems SO Gileras are falling in to the hands of the
type that may want to save a pound or two after having a blow up (Simon
excluded naturally), but would anyone on here buy a used piston? I've
certainly bought used matching barrel and pistons in the past (always
had a spare ready when racing the Rotarini). I suppose for absolute
unobtainium it might be the only option other than having one made.


--
+-------------------------------------------------------------------+
| Pete Fisher at Home: (E-Mail Removed) |
| Voxan Roadster Yamaha WR250Z/Supermoto "Old Gimmer's Hillclimber" |
| Gilera GFR * 2 Moto Morini 2C/375 Morini 350 "Forgotten Error" |
+-------------------------------------------------------------------+

In communiqué <(E-Mail Removed)>, Grimly
Curmudgeon <(E-Mail Removed)> cast forth these pearls of
wisdom
>We were somewhere around Barstow, on the edge of the desert, when the
>drugs began to take hold. I remember Pete Fisher
><(E-Mail Removed)> saying something like:
>
>>I doubt there is any problem sourcing a new Nordwest piston from Uncle
>>Bob Wright, but it seems SO Gileras are falling in to the hands of the
>>type that may want to save a pound or two after having a blow up (Simon
>>excluded naturally), but would anyone on here buy a used piston?
>
>If it was exactly the size I needed and in good nick, yes.

Good point. The bialbero motor features a nikasil bore (so no oversize
pistons without a 'big bore' conversion barrel) but three 'classes' of
piston for piston/cylinder matching. I certainly don't have anything
capable of measuring accurately if it's 'A': 97.964 - 97.970 or 'C' :
97.976 - 97.982.

If ICBA I might call in to Piston Services[1] if they are still in
business and get them to mic it up.


[1] An excellent place for rebores. The owner used to have an AJS *car*.

--
+-------------------------------------------------------------------+
| Pete Fisher at Home: (E-Mail Removed) |
| Voxan Roadster Yamaha WR250Z/Supermoto "Old Gimmer's Hillclimber" |
| Gilera GFR * 2 Moto Morini 2C/375 Morini 350 "Forgotten Error" |
+-------------------------------------------------------------------+

On Sat, 10 Jul 2010 15:15:44 +0100, Pete Fisher
<(E-Mail Removed)> wrote:

snip>

>Good point. The bialbero motor features a nikasil bore (so no oversize
>pistons without a 'big bore' conversion barrel) but three 'classes' of
>piston for piston/cylinder matching. I certainly don't have anything
>capable of measuring accurately if it's 'A': 97.964 - 97.970 or 'C' :
>97.976 - 97.982.
>
You won't get an accurate measurement in your garage when you're
looking at those sort of limits, you'd have to make sure the
micrometer and piston were left together in a room held at 18c for
about 12 hours. A sigma comparator is the best way to check that sort
of thing but they're not that common in rebore shops.

In communiqué <(E-Mail Removed)>, Andy Bonwick
<(E-Mail Removed)> cast forth these pearls of wisdom
>On Sat, 10 Jul 2010 15:15:44 +0100, Pete Fisher
><(E-Mail Removed)> wrote:
>
>snip>
>
>>Good point. The bialbero motor features a nikasil bore (so no oversize
>>pistons without a 'big bore' conversion barrel) but three 'classes' of
>>piston for piston/cylinder matching. I certainly don't have anything
>>capable of measuring accurately if it's 'A': 97.964 - 97.970 or 'C' :
>>97.976 - 97.982.
>>
>You won't get an accurate measurement in your garage when you're
>looking at those sort of limits, you'd have to make sure the
>micrometer and piston were left together in a room held at 18c for
>about 12 hours. A sigma comparator is the best way to check that sort
>of thing but they're not that common in rebore shops.
>

ISWYM. Possibly explains why the pistons on Ebay are from machines of
the + tens of thous oversize era.

Tip it is then

--
+-------------------------------------------------------------------+
| Pete Fisher at Home: (E-Mail Removed) |
| Voxan Roadster Yamaha WR250Z/Supermoto "Old Gimmer's Hillclimber" |
| Gilera GFR * 2 Moto Morini 2C/375 Morini 350 "Forgotten Error" |
+-------------------------------------------------------------------+

On 10/07/2010 17:36, Pete Fisher wrote:
> In communiqué <(E-Mail Removed)>, Andy Bonwick
> <(E-Mail Removed)> cast forth these pearls of wisdom
>> On Sat, 10 Jul 2010 15:15:44 +0100, Pete Fisher
>> <(E-Mail Removed)> wrote:
>>
>> snip>
>>
>>> Good point. The bialbero motor features a nikasil bore (so no oversize
>>> pistons without a 'big bore' conversion barrel) but three 'classes' of
>>> piston for piston/cylinder matching. I certainly don't have anything
>>> capable of measuring accurately if it's 'A': 97.964 - 97.970 or 'C' :
>>> 97.976 - 97.982.
>>>
>> You won't get an accurate measurement in your garage when you're
>> looking at those sort of limits, you'd have to make sure the
>> micrometer and piston were left together in a room held at 18c for
>> about 12 hours. A sigma comparator is the best way to check that sort
>> of thing but they're not that common in rebore shops.
>>
>
> ISWYM. Possibly explains why the pistons on Ebay are from machines of
> the + tens of thous oversize era.
>
> Tip it is then
>

<waves>

I'll look after it if you are tipping it.

You never know.

--
/Simon

In communiqué <(E-Mail Removed)>, Simon Wilson
<(E-Mail Removed)> cast forth these pearls of wisdom
>On 10/07/2010 17:36, Pete Fisher wrote:
>> In communiqué <(E-Mail Removed)>, Andy Bonwick
>> <(E-Mail Removed)> cast forth these pearls of wisdom
>>>>
>>> You won't get an accurate measurement in your garage when you're
>>> looking at those sort of limits, you'd have to make sure the
>>> micrometer and piston were left together in a room held at 18c for
>>> about 12 hours. A sigma comparator is the best way to check that sort
>>> of thing but they're not that common in rebore shops.
>>>
>>
>> ISWYM. Possibly explains why the pistons on Ebay are from machines of
>> the + tens of thous oversize era.
>>
>> Tip it is then
>>
>
><waves>
>
>I'll look after it if you are tipping it.
>

Expect a small package in the post, but not for a week or so.

>You never know.
>

That kind of thinking leads eventually to the sort of clear out that I
am having to undertake.

--
+-------------------------------------------------------------------+
| Pete Fisher at Home: (E-Mail Removed) |
| Voxan Roadster Yamaha WR250Z/Supermoto "Old Gimmer's Hillclimber" |
| Gilera GFR * 2 Moto Morini 2C/375 Morini 350 "Forgotten Error" |
+-------------------------------------------------------------------+

On 11/07/2010 18:41, Pete Fisher wrote:

>> <waves>
>>
>> I'll look after it if you are tipping it.
>>
>
> Expect a small package in the post, but not for a week or so.

tyvm. I'll owe you a beer for that.

>
>> You never know.
>>
>
> That kind of thinking leads eventually to the sort of clear out that I
> am having to undertake.
>

<G> yes IKWYM. I've actually accumulated a couple of boxes of spares for
that bike already.

--
/Simon