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Post by andygraham on Nov 15, 2011 20:02:07 GMT 1
found these in the garage they have rings fitted and 31k stamped inside they look new are they? theres a few marks on the skirt probably from fitting in the barrels but dont look theyve been fired up     |
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Post by Bazille on Nov 15, 2011 20:06:22 GMT 1
looks like they have been used as you can pick out the upright marks along piston sides!!
colin
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nikp
L plate rider.
He who dies with the most toys wins
Posts: 26
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Post by nikp on Nov 15, 2011 20:16:15 GMT 1
Look used to me. Personally wouldn't risk using 'em
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Post by andygraham on Nov 15, 2011 20:22:55 GMT 1
they look worse in th photos i would say theyve been a barrel  just they look as pistons out the box are |
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Post by Witterz on Nov 15, 2011 21:50:32 GMT 1
Am I right in thinking the 250 on the piston crowns means they are virtually on the last oversize / rebore for a 350cc, or have i got this totally wrong ??
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Post by LC_BOTT on Nov 15, 2011 22:01:11 GMT 1
Thay look quite used and been cleaned up to me, whats all the gunk and discolouration on the rings, you don't get that from just fitting in the bores.
I've never seen a set with a chamfer on the side either (i'm no expert BTW), are they genuine Yam or aftermarket?
Witterz, 25 is the first oversize piston, so a long way to go yet.
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Post by daglad on Nov 15, 2011 22:15:14 GMT 1
I have just had a couple of new pistons delivered and looking at them and the photo's of yours, the ones you have have definately seen some life mate
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Post by lcowner on Nov 15, 2011 22:18:10 GMT 1
250 means 2.5 over size so yeah there the last piston u can use
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Post by andygraham on Nov 15, 2011 22:25:21 GMT 1
cheers guys they werent for my bike mines on standard bores size  |
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higgsy
Thrash Merchant
Posts: 458
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Post by higgsy on Nov 16, 2011 12:46:15 GMT 1
That's too big to be a Yamaha piston isn't it? thought they only went up to 1.5?
Anyway they have been used a fair amount then cleaned up, I do know racers who swear by used pistons, something to do with them being looser and heat cycled properly
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Post by andygraham on Nov 17, 2011 12:19:28 GMT 1
They have 31k on them
Goin in the bin now
Thanks for the help
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