KZ440

Nebr_Rex wrote: Where did you hear about 600cc?
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650ed wrote: Here's a pic of a KZ440 that's bored all the way out. :laugh: Ed

_panc_ wrote: So in relation to the 600(ish) size what my buddy was referring to putting a 650s pistons in. BUT that wouldn’t really do much cause the 650s piston is essentially the same size but what makes it a 650 is that it’s working across more cylinders than the 440.

650ed wrote:

_panc_ wrote: So in relation to the 600(ish) size what my buddy was referring to putting a 650s pistons in. BUT that wouldn’t really do much cause the 650s piston is essentially the same size but what makes it a 650 is that it’s working across more cylinders than the 440.

Where did you find that the KZ650 pistons were "essentially the same size" as those of the KZ440? I read that the KZ440 bore & stroke is 67.5 mm x 62.0 mm (2.7 x 2.4 inches) where as the KZ650 bore & stroke is 62 X 54mm (2.44 x 2.13 inches) (see links below). That's a pretty big difference. Think of it this way - if a 2 cylinder engine has 2 pistons and a displacement of about 440cc then a 4 cylinder engine with 4 of the same size pistons would have a displacement of about 880cc (that's 2 x 440).

Rather than rely too much on your buddy's opinions you would do well to do more research on your own. There is a lot of info available on the internet. Ed

bikez.com/motorcycles/kawasaki_z_440_ltd_1981.php

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specs.kz650.info/TechSpecs.htm

_panc_ wrote: So in relation to the 600(ish) size what my buddy was referring to putting a 650s pistons in. BUT that wouldn’t really do much cause the 650s piston is essentially the same size but what makes it a 650 is that it’s working across more cylinders than the 440...
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