KZ 1000 cylinder block max. bore size

Scirocco
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KZ 1000 cylinder block max. bore size

25 Feb 2019 11:39

#799184

What is the maximum safe bored out size for a 77/78 KZ 1000 cylinder/sleeve?

My 1975 Z 1 B 900 Project

www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode

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SWest
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Re: KZ 1000 cylinder block max. bore size

25 Feb 2019 12:07

#799185

1105

Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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Scirocco
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Re: KZ 1000 cylinder block max. bore size

25 Feb 2019 12:29

#799186

So max. 73,00 mm bore size.

Thanks Steve

My 1975 Z 1 B 900 Project

www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode

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Re: KZ 1000 cylinder block max. bore size

25 Feb 2019 12:48

#799187

I think it's the max for the liners. I plan on them for my bike.
Steve

Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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DFIGPZ
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Re: KZ 1000 cylinder block max. bore size

25 Feb 2019 13:48

#799191

Beware 1105 is Possible but Sleeves are thin 1075 a better option IMO.

1984 750 Turbo

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zed1015
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Re: KZ 1000 cylinder block max. bore size

25 Feb 2019 13:55

#799194

Max size on stock 1000 liners is 73mm = 1105cc.
It does leave the liners a little thin at the spigot which is prone to cracking at that size.
Also the thin liner also causes accelerated ring wear and oil consumption under high load as the liner suffers microscopic distortion.
Personally I don't go bigger than 72mm on the stock liner.

AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
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Scirocco
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Re: KZ 1000 cylinder block max. bore size

25 Feb 2019 14:14

#799196

Ok thank you guys, then i will do an upgrade with this high compression piston kit with 70,50 mm bore size.

My 1975 Z 1 B 900 Project

www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode

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Re: KZ 1000 cylinder block max. bore size

25 Feb 2019 14:25

#799198

Looking foward to follow you upgrade project

I assume you update your project thread with pictures ad text?

Have consider replace liners so you can go bigger?

1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine

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Scirocco
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Re: KZ 1000 cylinder block max. bore size

25 Feb 2019 14:45 - 25 Feb 2019 14:49

#799200

gordone, replacing the liners are much more expensive. do you have some extra 600 euro for me?
My engine case is bored for 1200 ccm liners, 80 mm OD

My 1975 Z 1 B 900 Project

www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode

Last edit: 25 Feb 2019 14:49 by Scirocco.

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SWest
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Re: KZ 1000 cylinder block max. bore size

25 Feb 2019 14:53

#799202

I have a spare 1015 block so I could go 1105 and keep the one I have as a spare.
Steve

Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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Street Fighter LTD
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Re: KZ 1000 cylinder block max. bore size

25 Feb 2019 17:33

#799227

Hot combo
MTC 1075 cc kit in stock liners
Dave

Original owner 78 1000 LTD
Mr Turbo Race Kit, MTC 1075 Turbo pistons by PitStop Performance , Falicon Ultra Lite Super Crank, APE everything. Les Holt @ PDM's Billet Goodies . Frame by Chuck Kurzawa @ Logghe Chassis . Deep sump 5qt oil pan. RIP Bill Hahn

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Big Jay
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Re: KZ 1000 cylinder block max. bore size

25 Feb 2019 22:26

#799237

As one who has probably done more of these than anyone else, I can say the 1105 will fit and we do it for people who absolutely insist. However it is my opinion that a 1075 motor will make more power because the liners will stay round and provide ring seal. We still do a large number of 1075s. I believe the 70.5 mm kit the other poster is going to use would not be worth it when he could get an extra 50cc for the same money.

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