collapse

www.dimecitycycles.com

www.cognitomoto.com

https://www.townmoto.com/collections/vanson-leathers

www.speedmotoco.com

www.CITYLIMITMOTO.com

www.jadusmotorcycleparts.com

www.lostapostlejewelry.com

www.sparckmoto.com

www.pistonsociety.com


Author Topic: KZ 750 Twin - Two point zero  (Read 63746 times)

Offline canyoncarver

  • DTT SUPPORTER
  • *
  • Posts: 3977
  • 'hacking is learning'
Re: KZ 750 Twin - Two point zero
« Reply #150 on: Jul 01, 2016, 22:50:39 »
Great stuff on the German Z750 forum.

Offline doc_rot

  • DTT BOTM WINNER
  • *
  • DTT SUPPORTER
  • *
  • Posts: 1296
  • Oh the usual... I bowl, I drive around...
Re: KZ 750 Twin - Two point zero
« Reply #151 on: Jul 02, 2016, 00:02:01 »
that advert is pretty awesome. Its funny to look back and see how much advertising has changed. you would never see that much text these days.

Offline advCo

  • DTT BOTM WINNER
  • *
  • Posts: 3220
  • Nick Ol' Eye
    • adventur Studios
Re: KZ 750 Twin - Two point zero
« Reply #152 on: Jul 02, 2016, 00:08:57 »
I liked the bit about the British twins "leaked oil out of everything but the handlebar grips"  ;D

Offline canyoncarver

  • DTT SUPPORTER
  • *
  • Posts: 3977
  • 'hacking is learning'
Re: KZ 750 Twin - Two point zero
« Reply #153 on: Jul 03, 2016, 17:19:42 »
I love ads from back a ways, classic stuff.   I picked up a set of ebay cams for cores to send off to Megacycle.  I'm trying to wait a bit until I get some more piston stuff figured out.

Doc, I know you were talking biggest bore option but I don't think I'm going to build this one as hot.  I'd like to be in the 810-850cc range with a streetable but hotter cam.  I haven't got solid numbers on the street cam profile yet either. 

Offline doc_rot

  • DTT BOTM WINNER
  • *
  • DTT SUPPORTER
  • *
  • Posts: 1296
  • Oh the usual... I bowl, I drive around...
Re: KZ 750 Twin - Two point zero
« Reply #154 on: Jul 03, 2016, 18:02:01 »
As much as I would like to do the 86mm bore I think an 83mm bore would be the best for reliability and clearance issues in the cylinder block. that puts you at 865cc. Im veryinterested to hear what megacycle tells you.

Offline canyoncarver

  • DTT SUPPORTER
  • *
  • Posts: 3977
  • 'hacking is learning'
Re: KZ 750 Twin - Two point zero
« Reply #155 on: Jul 03, 2016, 19:42:32 »
As much as I would like to do the 86mm bore I think an 83mm bore would be the best for reliability and clearance issues in the cylinder block. that puts you at 865cc. Im veryinterested to hear what megacycle tells you.


That sounds very do-able.  Stock bore is 78mm at 8.5:1 compression.    What are you thinking in terms of valve changes if any, heavier springs?

Offline doc_rot

  • DTT BOTM WINNER
  • *
  • DTT SUPPORTER
  • *
  • Posts: 1296
  • Oh the usual... I bowl, I drive around...
Re: KZ 750 Twin - Two point zero
« Reply #156 on: Jul 03, 2016, 23:58:47 »
Definitely gonna need some heavier springs for the megacycle cams. I was going to have the head flow tested, but I'm guessing that like most of the UJMs the valves are too big to start with so an increase in cc's will probably have the stock valve sizes be just right. The one big incentive to have custom pistons made is that they can be higher compression to compensate for the loss of compression the new cams will cause.

Offline Nebr_Rex

  • DTT SUPPORTER
  • *
  • Posts: 888
Re: KZ 750 Twin - Two point zero
« Reply #157 on: Jul 04, 2016, 02:10:08 »
If somebody had a stock 750b piston to get the wrist pin to top of piston measurement.
I could possibly find an off the shelf oversize part that might work. Had a similar quest with
a 2.0 over 440 jugg. The search is like a drug for me, finding solutions for mechanical problems.


.

Offline redwillissuperman

  • Posts: 998
  • Keep it simple- engine, wheels, bars
Re: KZ 750 Twin - Two point zero
« Reply #158 on: Jul 04, 2016, 12:09:16 »


So are the KZ750 twins good bikes to ride? Looking at buying this tomorrow.

Offline doc_rot

  • DTT BOTM WINNER
  • *
  • DTT SUPPORTER
  • *
  • Posts: 1296
  • Oh the usual... I bowl, I drive around...
Re: KZ 750 Twin - Two point zero
« Reply #159 on: Jul 04, 2016, 14:54:59 »
If somebody had a stock 750b piston to get the wrist pin to top of piston measurement.
I just picked up some solvent for my parts cleaner so i will start the tear down on the motor this week and can get that measurement.



So are the KZ750 twins good bikes to ride? Looking at buying this tomorrow.

That looks super clean and well done. It has the GS1100E swingarm which is about 2" longer than stock. NOt sure what the front end it off but it looks quite a bit lower than stock. what are they asking?
« Last Edit: Jul 08, 2016, 01:07:47 by doc_rot »