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Cylinder Boring 14 Oct 2005 17:32 #1800

  • letthegoodtimesroll
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What is the largest you can bore out a 650. I just bought ".040" over pistons and rings and want know if I can go bigger than that if I need to later. Also, will I have to rejet. The bike is stock with the following exceptions:
Dyna S ignition
Dyna coils(green)
Kerker header with baffle
K&N air filter

I currently have 110 mains and 15 pilots.
Thanks

Post edited by: letthegoodtimesroll, at: 2005/10/14 20:35
1977 KZ650C1, Kerker Header, Dyna ignition and coils, GPZ 750 oil pan and cooler

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Cylinder Boring 14 Oct 2005 17:52 #1805

  • steell
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I think your next step oversize would have to be a Wiseco 720(?) kit, I don't believe Kawasaki lists an oversize piston past 1 mm, (.040"). If you have the $$ (I think around $700 or so), JE will make whatever oversize you specify :)

As long as you are just increasing displacement and not making any other changes, I doubt that you will have to change the jets. The only way to know for sure, is to check it :)
KD9JUR

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Cylinder Boring 14 Oct 2005 18:56 #1818

  • BSKZ650
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I dont think .040 is going to make any changes in air fuel mixture, if you change compression, cams, carbs, pods, header , then the mixture will need to be adjusted
77 kz650, owned for over 25 years
77 ltd1000, current rider
76 kz900, just waiting
73 z1,, gonna restore this one
piglet, leggero harley davidson
SR, Ride captian, S.E.Texas Patriot Guard Riders.. AKA KawaBob

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Cylinder Boring 19 Oct 2005 23:33 #2923

  • APE Jay
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720cc is as big as you can go, but no one makes that kit anymore. Wiseco still makes a 700 kit.

Jay
www.kzzone.com

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