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From: Simon Wilson on 10 Jul 2010 13:16
On 10/07/2010 17:36, Pete Fisher wrote:
> In communiqu� <ir6h36dlbsghpf40jpas12s9fho8fcegjb(a)4ax.com>, Andy Bonwick
> <nospam(a)bonwick.me.uk> cast forth these pearls of wisdom
>> On Sat, 10 Jul 2010 15:15:44 +0100, Pete Fisher
>> <Peter(a)ps-fisher.demon.co.uk> 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
From: Pete Fisher on 11 Jul 2010 13:41
In communiqu� <89ro89Ff43U1(a)mid.individual.net>, Simon Wilson
<siwilson(a)nodamnspamn.hotmail.com> cast forth these pearls of wisdom
>On 10/07/2010 17:36, Pete Fisher wrote:
>> In communiqu� <ir6h36dlbsghpf40jpas12s9fho8fcegjb(a)4ax.com>, Andy Bonwick
>> <nospam(a)bonwick.me.uk> 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: Peter(a)ps-fisher.demon.co.uk |
| Voxan Roadster Yamaha WR250Z/Supermoto "Old Gimmer's Hillclimber" |
| Gilera GFR * 2 Moto Morini 2C/375 Morini 350 "Forgotten Error" |
+-------------------------------------------------------------------+
From: Simon Wilson on 11 Jul 2010 15:44
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
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