ZX7R + ZXR750R crank = 830cc's???????

spekt-r · Post by **spekt-r** » Fri Oct 22, 2004 9:02 pm

Ive heard sticking a ZXR750R crank in your ZX7R increases the stroke thereby increasing ther capacity to about 830cc's anyone know if there is any truth in this? If the journal size is correct and if the stroke is actually compatible this could be a real cool mod for anyone rebuilding their engine or after more ponies.

Rossi · Post by **Rossi** » Fri Oct 22, 2004 11:22 pm

Tis true, got the mag around here somewhere. I'll see if I can find the article and scan it in

spekt-r · Post by **spekt-r** » Sat Oct 23, 2004 7:09 am

Cheers man that would be real cool.

Post by **icebreaker** » Sat Oct 23, 2004 8:57 am

Matt's mind must be doing over time on this one... lol

More power...

spekt-r · Post by **spekt-r** » Sat Oct 23, 2004 9:11 pm

Agreed, but his isnt the only one.
Im too sick of hearing the oh so common "ZX7's are too old/dated/heavy/underpowered/crap" thing. I wanna be able to make R1 owners weep, Ive almost got the handling and braking, some small tweaks will fix that, I really need more power though.

Post by **MadKaw** » Sun Oct 24, 2004 6:55 pm

Yep, it definately can be done. One of the guys who sent a pic to my zx7r site had done it and was putting out 129 hp at the rear wheel. One of the things you have to consider is the head clearance as the extra stroke requires additional gasket thickness.. he also said the std clutch didn't last too long..

spekt-r · Post by **spekt-r** » Sun Oct 24, 2004 7:00 pm

Hmmmm so id have to get something made up. I would have to be careful though because I wouldnt want to lose compression.

Post by **MadKaw** » Sun Oct 24, 2004 7:11 pm

It was all about not having too much compression... I think he may have doubled up on head gaskets or something.. He sent me all the info on what he did... unfortunately, I no longer have it...

I just checked my site, it says 135hp at the rear wheel and there is an e-mail addy on there. Don't know if its current as the pic was posted about 4 or 5 years ago..
http://zx7r.superbikeclub.com/visitors/steve2.jpg

Bluefly · Post by **Bluefly** » Mon Oct 25, 2004 12:06 pm

icebreaker wrote:Matt's mind must be doing over time on this one... lol

More power...

Matt doesn't have internet access atm....when he gets it back he's going to go insane over this!!

spekt-r · Post by **spekt-r** » Mon Oct 25, 2004 12:26 pm

Thanks for the link madkaw, i might drop that guy an email and see if its still an active address.

greenman43 · Post by **greenman43** » Fri May 06, 2005 10:21 pm

If anyone is looking for one, I have a spare ZXR crank in Sydney for $250.

Cheers,
Brian

Ment · Post by **Ment** » Sat May 07, 2005 5:18 am

Yeah i was looking into this myself.
checkou http://www.zx8r.com
Ray stringer in the uk is/was doing this conversion.
goes out to 793cc.

sounds like a bit of fun

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ZX7R + ZXR750R crank = 830cc's???????

ZX7R + ZXR750R crank = 830cc's???????

re: ZX7R + ZXR750R crank = 830cc's???????

re: ZX7R + ZXR750R crank = 830cc's???????

re: ZX7R + ZXR750R crank = 830cc's???????

re: ZX7R + ZXR750R crank = 830cc's???????

re: ZX7R + ZXR750R crank = 830cc's???????

re: ZX7R + ZXR750R crank = 830cc's???????

re: ZX7R + ZXR750R crank = 830cc's???????

Re: re: ZX7R + ZXR750R crank = 830cc's???????

re: ZX7R + ZXR750R crank = 830cc's???????

re: ZX7R + ZXR750R crank = 830cc's???????

re: ZX7R + ZXR750R crank = 830cc's???????