Number on piston?

Number on piston? 14 Nov 2006 06:06 #91962

cnyl Topic Author Offline User Posts: 344 Thank you received: 5	Hi guys. I just cleaned the pistons on my 80 Kz550. There is the number 50 marked on top of them. Does that mean it's bored 50 over? I noticed that a stock piston has no marking on it. Thanks 1982 KZ1000 M2 CSR North Port, FL Check out my band www.myspace.com/tukrhill
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Number on piston? 14 Nov 2006 07:20 #91973

Duck Offline User e vica na i sau na ga Posts: 1267 Thank you received: 35	Most likely 0.50mm over. Not 50 thousandth of an inch over. XXXXXKawPen:the other green meat
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Number on piston? 14 Nov 2006 07:46 #91982

CoreyClough Offline User GPz550 Addiction Posts: 1094 Thank you received: 80	Factory offers two sized over stock, and I believe they are in mm. '85 GPz550(ZX550-A2) GPz550 Base Manual --> tinyurl.com/ze5b3qo GPz550 Supplement Manual --> tinyurl.com/h34d2o6 GPz550.com --> www.nwsca.com/scripts/gpz_forum_2005/default.asp First Race Win GPz550 --> tinyurl.com/o5y3ftp
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Number on piston? 14 Nov 2006 13:36 #92093

cnyl Topic Author Offline User Posts: 344 Thank you received: 5	Thanks guys. So when I buy new rings I need to get 2 over? (2 over = 0.50) 1982 KZ1000 M2 CSR North Port, FL Check out my band www.myspace.com/tukrhill
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Number on piston? 14 Nov 2006 14:19 #92100

steell Offline User Posts: 6850 Thank you received: 207	It seems like most KZ's use .5mm as the first oversize and 1mm as the second oversize. I don't think I have seen any .25mm oversize, so you would have 1st oversize pistons. KD9JUR
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Number on piston? 14 Nov 2006 18:34 #92172

cnyl Topic Author Offline User Posts: 344 Thank you received: 5	Ummmmmm. Now i'm confused. It doesn't take much. 1982 KZ1000 M2 CSR North Port, FL Check out my band www.myspace.com/tukrhill
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Number on piston? 14 Nov 2006 19:30 #92193

steell
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Everyone is saying the same thing, .5mm=.50mm

I think you probably need the following part number (4 each):

13025-1010 RING-SET-PISTON-L

.50mm = .020"

Aaww crap!! I was editing my post and accidentally deleted all my references!! :angry:

Short version:
There is a seller on eBay that is selling a .50mm oversize piston for a KZ550. If you copy the part number he has listed and paste it in the "Part Number Search" block at Ron Ayers it will show you the part number that superceded that one, then go to Kawasaki.com and look up the part number for first oversize (L) pistons for your bike, and you will see that the part numbers match.

50 = .50mm = first oversize = I QUIT!!!

Can't believe I had to type all that twice. now my two typing fingers are all worn out :laugh:

Post edited by: steell, at: 2006/11/14 23:07

KD9JUR

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Number on piston? 15 Nov 2006 06:24 #92256

rstnick
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Aaww crap!! I was editing my post and accidentally deleted all my references!!
Can't believe I had to type all that twice. now my two typing fingers are all worn out

I hate when that happens! :angry:

Rob
CANADA

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1978 KZ650 C2, 130K kms, Delkevic ex, EI, CVK32, PMC easy clutch, ATK fork brace, steering damper, braced swingarm, 18" Z1R front wheel.
2000 ZRX1100
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Number on piston? 15 Nov 2006 06:32 #92258

77KZ650 Offline User Posts: 1397 Thank you received: 7	kinda on topic questions: are the kaw OS pistons also made by ART (same as the stock ones)? and are they generally the same compression ratio? Scott 07 MDP Rookie of the Year 01 ZX-12R street/drag bike. 8.97 @155.7 pump gas, dot tires, no bars, no power adders. top speed in the 1/4: 161MPH
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Number on piston? 15 Nov 2006 06:53 #92263

steell Offline User Posts: 6850 Thank you received: 207	77KZ650 wrote: kinda on topic questions: are the kaw OS pistons also made by ART (same as the stock ones)? and are they generally the same compression ratio? Scott The 750 twins and fours are, I don't have first hand knowledge on other models though. KD9JUR
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Number on piston? 15 Nov 2006 06:59 #92266

wiredgeorge Offline User Posts: 5310 Thank you received: 44	They are ART pistons for the OEM oversized for the 900/1000 I believe... also same compression ratio. Post edited by: wiredgeorge, at: 2006/11/15 10:00 wiredgeorge Motorcycle Carburetors Mico TX www.wgcarbs.com Too many bikes to list!
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Number on piston? 15 Nov 2006 07:02 #92268

cnyl Topic Author Offline User Posts: 344 Thank you received: 5	Thanks steel. Let those fingers rest for a while.. 1982 KZ1000 M2 CSR North Port, FL Check out my band www.myspace.com/tukrhill
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