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Author Topic: CR31 specs and info  (Read 3187 times)

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Offline Retro Rocket

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CR31 specs and info
« on: July 26, 2012, 02:19:47 am »
Hi all, Whilst moving a couple of months back i found amongst all my old Honda stuff a late 1970's Yoshimura and Moriwaki catalog, a few guys here asked if i could print or scan the CR info so here it is... ;)







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750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline voxonda

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Re: CR31 specs and info
« Reply #1 on: July 26, 2012, 03:59:13 am »
Ok, thanks RR.

Well now I have the info, sent me the actual carb's so I can move on!



LOL, Thanks mate.

Rob
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Offline lordmoonpie

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Re: CR31 specs and info
« Reply #2 on: July 26, 2012, 04:05:50 am »
Shameless hijack  but I have a set of genuine CR750 keihin CR31s, all set up for a CR750 race motor that I am thinking of selling. They will come with a set of black plastic period set of velocity stacks but I have many sets of various length plastic and alloy velocity stacks too available under separate negotiation....I know what this stuff is worth, so make me a sensible offer if you're interested and it might convince me to part with them!
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1951 Ducati 50cc Cucciolo
1981 Yamaha XV750 SE

Offline Retro Rocket

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Re: CR31 specs and info
« Reply #3 on: July 26, 2012, 04:33:19 am »
Quote from: voxonda on July 26, 2012, 03:59:13 am
Ok, thanks RR.

Well now I have the info, sent me the actual carb's so I can move on!



LOL, Thanks mate.

Rob

Sorry Rob, i still have my Yoshi set up CR31's but they have been promised to someone else.... ;)
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750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline voxonda

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Re: CR31 specs and info
« Reply #4 on: July 26, 2012, 06:08:21 am »
Ah well, that's life I supposse............  :( No worries matey, engine runs very strong with the special FD's I prepped.  ;)
Planning a few comparison dyno runs with the FD and some borrowed CR's.
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Offline lordmoonpie

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Re: CR31 specs and info
« Reply #5 on: August 01, 2012, 10:12:11 am »
Pops Yoshimura set up CR31s now on ebay....enjoy :D

Ebay item number: 200801130343
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1994 Ducati 888 SP5
1951 Ducati 50cc Cucciolo
1981 Yamaha XV750 SE

Offline CR750

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Re: CR31 specs and info
« Reply #6 on: August 02, 2012, 02:46:01 am »
@ RR
Thanks for the efffort !

@LMP very nice set,  I would be all over it if I had that kind of money laying around....
Still (4 years and counting)  looking all over the world for an affordable someone-that-does-not-know-what-they-got  ;D set of these for my CR750 replica. Just the other day I thought I got lucky, but it turned out it had parts broken out of some carb bodies and internals missing, and the guy still wanted 800 euros for them ! Have you seen Yoshi's garage or Keihinfcr on Ebay ? You are asking a very fair price, considering... I think they just buy all sets they can and then they (try to) re-sell these at >3500 Dollars !!!

I think nowadays a lot of people/salesmen actually just have these stacked somewhere as an investment, instead of putting them on a bike and actually riding them, it's a bit of a shame ( although at 3500 dollars I would be afraid to put gas in it to !  8) ).
« Last Edit: August 02, 2012, 02:48:56 am by cr750 »
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Offline MRT500

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Re: CR31 specs and info
« Reply #7 on: August 26, 2014, 11:30:13 pm »
Hello there,
Thanks all who have replied promptly , The application of these carbs are for a  Honda s600.The CR31 carbs were also  utilised for honda race cars  as well as the bikes  ,The current  jetting on these carbs were somewhat large to say the least measuring 2.25 having been set up for a big bore / methanol engine ,   I have since purchased main jets since my last posting,  I would like to get a photo copy of the CR CARB brochure from RETRO ROCKET if possible ,  would be very much appreciated.
Regards MRT500
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Offline Retro Rocket

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Re: CR31 specs and info
« Reply #8 on: August 27, 2014, 02:59:36 am »
Just click on the pics in this post to blow them up, right mouse click and "save image as" and save them to your nominated folder, its pretty easy mate, then you can just print them out.... ;)
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750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline MRT500

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Re: CR31 specs and info
« Reply #9 on: August 28, 2014, 12:50:53 am »
Hey . Why didnt I just think of that .

Thanks heaps
Mrt500
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