Z2 750 crank (Bossie the Kaw)

  • SWest
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  • 10 22 2014
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06 Dec 2016 05:18 #749631 by SWest
Replied by SWest on topic Z2 750 crank (Bossie the Kaw)
No, 58 as opposed to 66.
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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06 Dec 2016 06:49 #749641 by KZB2 650
Replied by KZB2 650 on topic Z2 750 crank (Bossie the Kaw)
Wow I thought I read one time it was only a 3mm difference...... 8mm that's like 5/16ths of an inch isn't it?.... Have no idea but man you might a been running 6 or 7 to 1 with that don't you think ??
1978 KZ650 b-2
700cc Wiseco kit 10 to 1.
1980 KZ750 cam, ape springs, stock clutch/ Barnett springs.
Vance and Hines Header w/ comp baffle and Ape pods, Dyna S and green coils, copper wires.
29MM smooth bores W/ 17.5 pilots, 0-6s and 117.5 main
16/42 gearing X ring chain and alum rear JT sprocket.

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06 Dec 2016 07:07 #749644 by SWest
Replied by SWest on topic Z2 750 crank (Bossie the Kaw)
Yeah, with the Wiseco's I didn't notice it. When I lunched another piston and had to use the stock 1000 pistons that came with the 1015 barrels, it was obvious. It still ran great, a little better when I put the 10.25/1's back in. I still haven't done a compression test. I will before I tear it down again. Says a lot about these motors. B)
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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06 Dec 2016 16:19 #749679 by missionkz
Replied by missionkz on topic Z2 750 crank (Bossie the Kaw)

swest wrote: No, 58 as opposed to 66.
Steve

Wow.... I never realized that you were down 165cc at 6:1 - 7:1 compression ... You're going to have to learn how to ride all over again!!
Bruce
1977 KZ1000A1
2016 Triumph T120 Bonneville
Far North East Metro Denver Colorado

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06 Dec 2016 17:12 #749680 by SWest
Replied by SWest on topic Z2 750 crank (Bossie the Kaw)
Might be a blessing in disguise. How did you come up with those figures?
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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06 Dec 2016 18:16 #749687 by missionkz
Replied by missionkz on topic Z2 750 crank (Bossie the Kaw)

swest wrote: Might be a blessing in disguise. How did you come up with those figures?
Steve

wild ass guess and shorter stroke with same bore as a 1015 engine?
Bruce
1977 KZ1000A1
2016 Triumph T120 Bonneville
Far North East Metro Denver Colorado

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06 Dec 2016 18:20 #749688 by SWest
Replied by SWest on topic Z2 750 crank (Bossie the Kaw)
I'm going to fix my compression tester. It'll give us a better idea what it is. :whistle:
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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06 Dec 2016 18:26 #749690 by missionkz
Replied by missionkz on topic Z2 750 crank (Bossie the Kaw)
I wish I would have written it down but I think mine was around 175psi a couple weeks after I put the 1075 kit in.
That was about 5000 miles ago.
Bruce
1977 KZ1000A1
2016 Triumph T120 Bonneville
Far North East Metro Denver Colorado

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06 Dec 2016 18:54 - 06 Dec 2016 19:04 #749692 by missionkz
Replied by missionkz on topic Z2 750 crank (Bossie the Kaw)

swest wrote: Might be a blessing in disguise. How did you come up with those figures?
Steve

OK daydreaming.
58mm stroke with 70mm bore?
So 35sqrd x3.1416 x 58
892cc?
But you are running those 70mm 10:1 pistons so ... even with the stroke not pushing the piston further up into the combustion chamber, your actual compression is probably more then 8:1.
Bruce
1977 KZ1000A1
2016 Triumph T120 Bonneville
Far North East Metro Denver Colorado
Last edit: 06 Dec 2016 19:04 by missionkz.

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  • SWest
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06 Dec 2016 19:01 #749694 by SWest
Replied by SWest on topic Z2 750 crank (Bossie the Kaw)
I want to weigh both cranks to see if there is a difference or if it's just shorter rods. Looks like something that hasn't been done before. :)
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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10 Dec 2016 02:23 #749876 by cjcrug
Replied by cjcrug on topic Z2 750 crank (Bossie the Kaw)
Nice pass man, looks like it pulls purty good
79 KZ 1000 B3 LTD
Wiseco 1105
Kerker 4 into 1
Dyna s ignition
Dyna green coils
K and n pods
Andrews 2x cams

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10 Dec 2016 02:26 #749877 by cjcrug
Replied by cjcrug on topic Z2 750 crank (Bossie the Kaw)
Lol idk how my post got two pages forward, it was a reply to the video
79 KZ 1000 B3 LTD
Wiseco 1105
Kerker 4 into 1
Dyna s ignition
Dyna green coils
K and n pods
Andrews 2x cams
The following user(s) said Thank You: SWest

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