differences 4cyl 650 to 4cyl 750

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08 Apr 2007 11:18 #127712 by SLEEPER650
differences 4cyl 650 to 4cyl 750 was created by SLEEPER650
what are the differences from a 650 to 750 4cyl? is it just the bore size or is there a stroke difference? i know the rods are the same.
78 650sr my baby
78 650sr waiting for rebuild
82 kz1100

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08 Apr 2007 11:50 #127720 by cottoncandyninja
Replied by cottoncandyninja on topic differences 4cyl 650 to 4cyl 750
i have a 750 and was always under the impression the bottom end was different. at the same time i dont know a whole lot about 650s either.

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08 Apr 2007 11:55 #127723 by guitargeek
Replied by guitargeek on topic differences 4cyl 650 to 4cyl 750
Early 650s used a bicycle style cam chain, but the later models used the hyvo chain like the 750s. The major differences were a smaller bore and slightly smaller valves. A 750 top end will bolt onto a later model 650 bottom easily, and will bolt onto an early model 650, but you have to keep the cam chain sprockets and idler sprocket from the 650.
1980 KZ750-H1 (slightly altered)
1987 KZ1000-P6 "Ponch"
1979 GS1000 "Dadzuki"

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08 Apr 2007 13:53 #127764 by rstnick
Replied by rstnick on topic differences 4cyl 650 to 4cyl 750
Welcome Sleeper650.

750-stroke=54mm, bore=66mm, CC=738, Comp Ratio=9.0:1

650-stroke=54mm, bore=62mm, CC=652, Comp Ratio=9.5:1 (LTD 9.0:1)

Corrected. :whistle:

Post edited by: rstnick, at: 2007/04/09 10:40
Rob
CANADA

Need a key for your Kawasaki? PM me

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
2011 Ninja 250R
2005 z750s

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08 Apr 2007 14:28 #127774 by SLEEPER650
Replied by SLEEPER650 on topic differences 4cyl 650 to 4cyl 750
well this is what i have i have two sets of jugs a 650 jug that mesures2.440inch and a 750 jug that mesures 2.600inch if what your saying is correct then the 750 is .160 over already.
78 650sr my baby
78 650sr waiting for rebuild
82 kz1100

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08 Apr 2007 18:59 #127863 by agawam
Replied by agawam on topic differences 4cyl 650 to 4cyl 750
he has the B&S backwards should be 54mm stroke for both and 62mm bore for 650 and 66mm bore for the 750

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09 Apr 2007 02:37 #128018 by SLEEPER650
Replied by SLEEPER650 on topic differences 4cyl 650 to 4cyl 750
thank you that sounds better. yesterday i picked ut an 83gpz 750 for 15.50 . so im on my way to an 810
78 650sr my baby
78 650sr waiting for rebuild
82 kz1100

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09 Apr 2007 06:17 - 20 Feb 2013 18:47 #128044 by H1Vindicator
Replied by H1Vindicator on topic ----
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Last edit: 20 Feb 2013 18:47 by H1Vindicator.

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09 Apr 2007 07:39 #128073 by rstnick
Replied by rstnick on topic differences 4cyl 650 to 4cyl 750
Ooops, sorry about that. :whistle: :blush:
Rob
CANADA

Need a key for your Kawasaki? PM me

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
2011 Ninja 250R
2005 z750s

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09 Apr 2007 18:06 #128236 by SLEEPER650
Replied by SLEEPER650 on topic differences 4cyl 650 to 4cyl 750
no harm done
78 650sr my baby
78 650sr waiting for rebuild
82 kz1100

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09 Apr 2007 20:20 #128313 by guitargeek
Replied by guitargeek on topic differences 4cyl 650 to 4cyl 750
SLEEPER650 wrote:

thank you that sounds better. yesterday i picked ut an 83gpz 750 for 15.50 . so im on my way to an 810


Am I to understand that you purchased a 1983 GPz750 for fifteen dollars and fifty cents?

Son of a...
1980 KZ750-H1 (slightly altered)
1987 KZ1000-P6 "Ponch"
1979 GS1000 "Dadzuki"

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10 Apr 2007 15:01 #128595 by SLEEPER650
Replied by SLEEPER650 on topic differences 4cyl 650 to 4cyl 750
you know the auction site
78 650sr my baby
78 650sr waiting for rebuild
82 kz1100

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