From: Pete Fisher on 10 Jul 2010 09:20 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: 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: Grimly Curmudgeon on 10 Jul 2010 09:32 We were somewhere around Barstow, on the edge of the desert, when the drugs began to take hold. I remember Pete Fisher <Peter(a)ps-fisher.demon.co.uk> 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.
From: Pete Fisher on 10 Jul 2010 10:15 In communiqu� <ejtg36t5vr7m6rg36cvg5k905894fnm5il(a)4ax.com>, Grimly Curmudgeon <grimly4REMOVE(a)REMOVEgmail.com> 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 ><Peter(a)ps-fisher.demon.co.uk> 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: 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: Andy Bonwick on 10 Jul 2010 12:21 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.
From: Pete Fisher on 10 Jul 2010 12:36 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 -- +-------------------------------------------------------------------+ | 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" | +-------------------------------------------------------------------+
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