Yoshimura R&D Superbike

  • mtbspeedfreak
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10 Sep 2012 02:05 #547764 by mtbspeedfreak
Yoshimura R&D Superbike was created by mtbspeedfreak
Well, after a year of thinking, researching, and finding parts, I figure I ought to start a build thread...

It all started with this picture:


I wound up starting a research thread , trying to find more information on that bike. As it turns out, that particular motorcycle was a scale model that took a good chunk of time to create.

I wound up finding this brochure on here - this is what I need to build my project:

2000 ZRX 1100
1976 KZ 900- Daily Driver
1980 LTD 550- Dalton Highway survivor!

If it has tits or tires, it'll give you problems!

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10 Sep 2012 02:22 - 14 Jun 2013 15:31 #547765 by mtbspeedfreak
Replied by mtbspeedfreak on topic Yoshimura R&D Superbike
So where do I stand today you ask???

Well, thanks to this great forum, I've sourced all of my parts as well as a project bike from members here.

Z1B basketcase- Kawiboy514
29mm smoothbore carbs- dutchz
Yosh slipper pistons- zrxrich
Yosh Series 1 4-1 exhaust- mark1122
Yosh Series 2 4-1 exhaust- porchev914
Z1R wheels- Mark Wing


Lately, I've been looking for motorcycle-related ways to make a bit of extra cash that I can use on this project. I have a few sets of VM28 carburetors that I'm meticulously rebuilding, the first set is ready to sell, here's the link ! Grab them while they're hot!

2000 ZRX 1100
1976 KZ 900- Daily Driver
1980 LTD 550- Dalton Highway survivor!

If it has tits or tires, it'll give you problems!
Last edit: 14 Jun 2013 15:31 by mtbspeedfreak. Reason: Addition

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10 Sep 2012 02:24 #547766 by mtbspeedfreak
Replied by mtbspeedfreak on topic Yoshimura R&D Superbike
Here's the basketcase '75 that I'm starting with. I kind of like the tank, might keep it ;)

[img

MMS_0442 by mmsmithgall , on Flickr

[img

MMS_0480 by mmsmithgall , on Flickr

[img

MMS_0470 by mmsmithgall , on Flickr

[img

MMS_0441 by mmsmithgall , on Flickr

[img

MMS_0436 by mmsmithgall , on Flickr

[img

MMS_0423 by mmsmithgall , on Flickr

2000 ZRX 1100
1976 KZ 900- Daily Driver
1980 LTD 550- Dalton Highway survivor!

If it has tits or tires, it'll give you problems!

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10 Sep 2012 02:29 #547767 by mtbspeedfreak
Replied by mtbspeedfreak on topic Yoshimura R&D Superbike
Here are the set of 29mm smoothbores I bought from dutchz. From what we know, they were likely "ported & polished" by Pops Yoshimura back in the 70s because the carburetor mouths are blended in to the velocity stacks and there's a small metallic Yoshimura sticker on the #1 carb float bowl.

[img

MMS_0332 by mmsmithgall , on Flickr

[img

MMS_0337 by mmsmithgall , on Flickr

[img

MMS_0342 by mmsmithgall , on Flickr

[img

MMS_0345 by mmsmithgall , on Flickr

[img

MMS_0357 by mmsmithgall , on Flickr

[img

MMS_0369 by mmsmithgall , on Flickr

2000 ZRX 1100
1976 KZ 900- Daily Driver
1980 LTD 550- Dalton Highway survivor!

If it has tits or tires, it'll give you problems!

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10 Sep 2012 02:33 - 10 Sep 2012 02:34 #547768 by mtbspeedfreak
Replied by mtbspeedfreak on topic Yoshimura R&D Superbike
I was lucky enough to track down a set of brand new Yoshimura Stage IV 1015cc slipper pistons.

[img

MMS_0377 by mmsmithgall , on Flickr

[img

MMS_0401 by mmsmithgall , on Flickr

[img

MMS_0409 by mmsmithgall , on Flickr

[img

MMS_0413 by mmsmithgall , on Flickr

[img

MMS_0414 by mmsmithgall , on Flickr

[img

MMS_0421 by mmsmithgall , on Flickr

[img

MMS_0392 by mmsmithgall , on Flickr

[img

MMS_0394 by mmsmithgall , on Flickr

[img

MMS_0407 by mmsmithgall , on Flickr

[img

MMS_0382 by mmsmithgall , on Flickr

[img

MMS_0386 by mmsmithgall , on Flickr

[img

MMS_0396 by mmsmithgall , on Flickr

2000 ZRX 1100
1976 KZ 900- Daily Driver
1980 LTD 550- Dalton Highway survivor!

If it has tits or tires, it'll give you problems!
Last edit: 10 Sep 2012 02:34 by mtbspeedfreak.

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10 Sep 2012 02:41 - 10 Sep 2012 02:43 #547770 by mtbspeedfreak
Replied by mtbspeedfreak on topic Yoshimura R&D Superbike
Now for the exhaust... the original Yosh AMA superbike had a modified 4-4 Z1 exhaust system. There's a place in Japan that remanufactures that exhaust system for a very hefty price of $3,500 USD.


For the time being, I'll just run a Yoshimura 4-1 system. A few months ago, I bought a Series I pipe, but that's at my parent's house in Pennsylvania at the moment - I'm waiting to bite the bullet to ship it cross-country. This past weekend, I scored a Series 2 pipe from porschev914. A dyno test waaay down the line will determine which system I use. :evil:

[img

MMS_0909 by mmsmithgall , on Flickr

[img

MMS_0915 by mmsmithgall , on Flickr

[img

MMS_0906 by mmsmithgall , on Flickr

[img

MMS_0899 by mmsmithgall , on Flickr

[img

MMS_0900 by mmsmithgall , on Flickr

[img

MMS_0903 by mmsmithgall , on Flickr

[img

MMS_0893 by mmsmithgall , on Flickr

2000 ZRX 1100
1976 KZ 900- Daily Driver
1980 LTD 550- Dalton Highway survivor!

If it has tits or tires, it'll give you problems!
Last edit: 10 Sep 2012 02:43 by mtbspeedfreak.

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  • Motor Head
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10 Sep 2012 10:36 #547807 by Motor Head
Replied by Motor Head on topic Yoshimura R&D Superbike
This really cool, great Idea to build one up. Really good job sourcing the parts, amazing the stuff was around. Keep up the good work, and keep posting pictures. :)

1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
1979 MAZDA RX7 in the works, 13B...

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  • mark1122
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10 Sep 2012 11:07 #547810 by mark1122
Replied by mark1122 on topic Yoshimura R&D Superbike
Looking forward to watching your build Mark.
Have fun. :)

76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.

~ ~ ~_@
~ ~ _- \,
~ (k) / (z)

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10 Sep 2012 12:32 #547818 by Mark Wing
Replied by Mark Wing on topic Yoshimura R&D Superbike
I can't wait to see some progress on this project.
I know where you can get it painted.
Mark

Jesus loves you Everyone else thinks your an ***

77 KZ650 C1 with ZX7 forks, GPZ mono rear, wider 18 police wheels and Yoshimura motor.

Yorba Linda Cal.

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  • BlackZ1R
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10 Sep 2012 13:59 #547833 by BlackZ1R
Replied by BlackZ1R on topic Yoshimura R&D Superbike
Wow, what a build. I'd be willing to bet that there are still a few sets of pistons stashed away in some of the team mechanics stashes.
You really went deep into the research and digging up of bona fied parts. The 4-4 would be over the top. Good job. Can't wait to see this one completed.

Kawasaki


Someone once told me to marry that motorcycle I was riding ......there's times I wish I hadda listened .

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10 Sep 2012 14:42 - 10 Sep 2012 15:33 #547837 by BohicaBob
Replied by BohicaBob on topic Yoshimura R&D Superbike
Yosh cams and valve springs/retainers can still be had, all it takes is (lots of) money! :)

Yosh Stuff
Last edit: 10 Sep 2012 15:33 by BohicaBob.

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10 Sep 2012 21:10 #547885 by 4TheKZ1000
Replied by 4TheKZ1000 on topic Yoshimura R&D Superbike
WOW...this is a cool build. please let use follow the build with plenty of pics....very intresting build and I would venture to say historic a-bit.....yes B) B) B)

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