Number on piston?

cnyl
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14 Nov 2006 06:06 #91962 by cnyl

Number on piston? was created by cnyl

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

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Duck
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e vica na i sau na ga

14 Nov 2006 07:20 #91973 by Duck

Replied by Duck on topic Number on piston?

Most likely 0.50mm over. Not 50 thousandth of an inch over.

XXXXXKawPen:the other green meat

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CoreyClough
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GPz550 Addiction

14 Nov 2006 07:46 #91982 by CoreyClough

Replied by CoreyClough on topic Number on piston?

Factory offers two sized over stock, and I believe they are in mm.

'85 GPz550(ZX550-A2)

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cnyl
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14 Nov 2006 13:36 #92093 by cnyl

Replied by cnyl on topic Number on piston?

Thanks guys. So when I buy new rings I need to get 2 over? (2 over = 0.50)

:huh:

1982 KZ1000 M2 CSR
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steell
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14 Nov 2006 14:19 #92100 by steell

Replied by steell on topic Number on piston?

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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cnyl
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14 Nov 2006 18:34 #92172 by cnyl

Replied by cnyl on topic Number on piston?

Ummmmmm. :huh: Now i'm confused. It doesn't take much.

1982 KZ1000 M2 CSR
North Port, FL

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steell
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14 Nov 2006 19:30 #92193 by steell

Replied by steell on topic Number on piston?

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: :laugh: :laugh:

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

KD9JUR

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rstnick
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15 Nov 2006 06:24 #92256 by rstnick

Replied by rstnick on topic Number on piston?

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:

:laugh:

Rob
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1978 KZ650 C2, 130K kms, Delkevic ex, EI, CVK32, PMC easy clutch, ATK fork brace, steering damper, Progressive Suspension, braced swingarm, ZRX shocks, 18" Z1R front wheel.
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77KZ650
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15 Nov 2006 06:32 #92258 by 77KZ650

Replied by 77KZ650 on topic Number on piston?

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

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steell
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15 Nov 2006 06:53 #92263 by steell

Replied by steell on topic Number on piston?

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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wiredgeorge
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15 Nov 2006 06:59 #92266 by wiredgeorge

Replied by wiredgeorge on topic Number on piston?

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

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cnyl
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15 Nov 2006 07:02 #92268 by cnyl

Replied by cnyl on topic Number on piston?

Thanks steel. Let those fingers rest for a while..

1982 KZ1000 M2 CSR
North Port, FL

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www.myspace.com/tukrhill

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