Author Topic: The 1970 Daytona CR750s. (Read 269977 times)

cobra · « **Reply #750 on:** November 01, 2011, 02:46:51 PM »

last2 one of hailwoods BSA

kos · « **Reply #751 on:** November 02, 2011, 08:16:48 AM »

Heads up. On ebay now is most complete inventory or CR750 CR900/1000 carbs parts anywhere is world.

look for under CR750

Thanks

Mark@M3racing.com

Ricky_Racer · « **Reply #752 on:** November 02, 2011, 09:15:45 AM »

Mark (or anyone), I've had early CR "tickler" carbs stamped either CR900 or CR750 on the brace. Currently have a set of the "CR900" on a CB750 drag bike. What is the difference between the two versions?

Thanks. RR

kos · « **Reply #753 on:** November 02, 2011, 12:38:17 PM »

CR750 has the equal (between each carb) spacing. Kaws and Zookies have a larger space between #2 and # 3...other than that carbs are the same.

Mark

Ricky_Racer · « **Reply #754 on:** November 02, 2011, 01:30:24 PM »

Thanks, Mark. I thought that might be the case. Evidently the CR900 carbs on the SOHC drag bike are making up the difference with the intake rubbers. I didn't see any mods to the hardware to change the spacing.

Do you know of a source for the usual gaskets, etc, for these pots? Or should I plan on cutting them? Nice thing is, these types of carbs have certainly not seen miles of use! Thanks again. Ted

BLUE71TURBO · « **Reply #755 on:** November 02, 2011, 04:01:56 PM »

Heads up cr750 fella's !! You gotta check this add out on ebay !!

http://www.ebay.com/itm/CR750-Keihin-Racing-Carbs-AHRMA-Cafe-Dragbike-RSC-HRC-/190596139124?hash=item2c606a4874&item=190596139124&pt=Motorcycles_Parts_Accessories&vxp=mtr

Sam Green Racing · « **Reply #756 on:** November 03, 2011, 02:22:59 AM »

Jon Boy, look at the 4 posts above.

BLUE71TURBO · « **Reply #757 on:** November 03, 2011, 06:49:09 PM »

Yea i know SAM

I was in a hurry and i didn't pay any attention to the previous posts . LOL !

andy750 · « **Reply #758 on:** December 31, 2011, 05:38:02 AM »

Not sure if these links have been added but detailed description of Daytona 200 with pics:

http://web.archive.org/web/20010419084956/http://www.geocities.com/yosemite/trails/6695/cr750scr.htm

and

http://web.archive.org/web/20010406085117/http://www.geocities.com/Yosemite/Trails/6695/cr750.htm

then follow the pages by clicking on "Honda CR750 cont`d" tab/pic at bottom of each page.

HondaMan · « **Reply #759 on:** January 01, 2012, 09:06:57 PM »

Quote from: andy750 on December 31, 2011, 05:38:02 AM

Not sure if these links have been added but detailed description of Daytona 200 with pics:

http://web.archive.org/web/20010419084956/http://www.geocities.com/yosemite/trails/6695/cr750scr.htm

and

http://web.archive.org/web/20010406085117/http://www.geocities.com/Yosemite/Trails/6695/cr750.htm

then follow the pages by clicking on "Honda CR750 cont`d" tab/pic at bottom of each page.

Thank you, Andy!
This is the first site I have seen in a long time (actually, the first website ever, as the rest are stories from folks I knew) that tells one of Dick Mann's secrets in the Daytona race. He was running the least cam of all, because his team was sorely aware of the camchain issue at redline. The oil flicks out of the chain in the reverse-roll it does below the roller at high speeds, and it wears out for lack of lube. The later tensioners (like the good one from Mark McGrew M3 Racing) solve the problem handily, in my limited experience with them.

Also, this site gives mention to the 3 different "kit cams" Yoshimura offered. The first one was 215 inlet duration (here called 89 HP), the second 225 duration (here called 92 HP) and the third, rare, was 235 degrees duration. They ranged from 8.5mm lift for the least to 9.2mm lift for the most.

I bring this up because today, the Webcams we see so often have even more than this, so let the builder take [cautious] note...

ratrap · « **Reply #760 on:** April 22, 2012, 07:56:35 AM »

Hi Guys

I am busy with a replica that I intend using on the road.
Anyone done this? Looking for ideas where to hide all the electrical bits and pieces and recommendations for switchgear.

Cheers

Gavin

Bill/BentON Racing · « **Reply #761 on:** April 22, 2012, 08:39:52 AM »

What a holeshot,Dick Mann Daytona 1970!!!! Their tuner switched the tensioner assembly's,Bob Hansen in charge of Dick's bike,he told Honda's F1 mgr Yoshio Nakamura's crew chiefs about their's starting to chunk ,but they ignored him!

Bill

Sam Green Racing · « **Reply #762 on:** April 23, 2012, 08:21:33 AM »

Quote from: ratrap on April 22, 2012, 07:56:35 AM

Hi Guys

I am busy with a replica that I intend using on the road.
Anyone done this? Looking for ideas where to hide all the electrical bits and pieces and recommendations for switchgear.

Cheers

Gavin

Gavin, you need to speak to your fellow country man Kevin (TTR400)
http://forums.sohc4.net/index.php?action=profile;u=224
It's been done before where people have retained the side covers and oil tank but you need to get the gas tank without the deep sump (look for pics of tanks to see what I mean)

Good luck and welcome to the nut house.

Sam.

There are some good tank pics on Erics thread.
http://forums.sohc4.net/index.php?action=profile;u=224

ratrap · « **Reply #763 on:** April 23, 2012, 11:07:17 AM »

Thanks Sam I will get hold of him.
Alas I already have the deep sump tank and have fabricated an oil tank!

I will have to be very imaginative!

spiritof67 · « **Reply #764 on:** May 08, 2012, 06:23:03 PM »

Does anyone have a link to the guy (from Holland?) who had the website covering his build of a "Dick Mann CR750"? I had it and lost it and am looking for some references he had. Also, wasn't there someone who was selling replicas of the oil tank mounts for the central aluminum tank on a CR750 and aircraft line/AN fitting converters so you could use them instead of the standard Honda oil lines?

Spirit

lordmoonpie · « **Reply #765 on:** May 18, 2012, 12:10:42 PM »

Quote from: spiritof67 on May 08, 2012, 06:23:03 PM

Does anyone have a link to the guy (from Holland?) who had the website covering his build of a "Dick Mann CR750"? I had it and lost it and am looking for some references he had. Also, wasn't there someone who was selling replicas of the oil tank mounts for the central aluminum tank on a CR750 and aircraft line/AN fitting converters so you could use them instead of the standard Honda oil lines?

Spirit

Think that was probably the Joep Kortekaas one you're talking about Spirit (sorry if the spelling is out my Dutch friends :-)) It was hosted on Lumpproof but I think it ended up as a dead link some time back. Try searching on Kortekaas and variants thereof and you might bring up some old cached pages...

spiritof67 · « **Reply #766 on:** May 25, 2012, 04:32:54 PM »

Thanks!

Spirit

kos · « **Reply #767 on:** July 23, 2012, 03:28:51 PM »

I have not been on the site much this year, so I might have missed it. Is any one making 4 bolt alloy or Mag sliders for the Honda 35mm front forks? I know all about using XL250/350 versions being made to work or the GL1000, but I am not interested in that. Please advise.

Thank you!

Mark @ M3 Racing Factory

mark@m3racing.com

Sam Green Racing · « **Reply #768 on:** July 23, 2012, 03:36:49 PM »

Mark, Eric Buckley had a set of magnesium fork legs cast, not sure if he has had them machined yet.

Sam.

Sam Green Racing · « **Reply #769 on:** July 23, 2012, 03:42:50 PM »

Check this thread, http://forums.sohc4.net/index.php?topic=94588.0

Sam.

H2Eric · « **Reply #770 on:** July 24, 2012, 05:49:38 AM »

Mark / Sam

The castings are currently in the hands of the machinist (Graham Sykes) and I'm informed that they are the next job in the queue, so hopefully not too long now before we see the end result. I'll be posting pics when they are done in my CR build thread.

Eric

kos · « **Reply #771 on:** July 25, 2012, 05:05:44 PM »

Eric, Again very nice work on your replica machine,and thank you for mentioning the M3 Racing name in your pictures and text.

I was wondering if I can purchase a pair of Mag fork sliders that are un-machined as my son can do all of that work here and I would like to get one with my customer's project?

Mark

lordmoonpie · « **Reply #772 on:** July 26, 2012, 04:17:51 AM »

Eric, Kos, I was talking to a CR750 officianado the other day and he said that the four bolt fork legs never appeared in the early CR750 kits, they only came on stream in 1973...what do you know about that?

H2Eric · « **Reply #773 on:** July 26, 2012, 05:58:18 AM »

Quote from: kos on July 25, 2012, 05:05:44 PM

Eric, Again very nice work on your replica machine,and thank you for mentioning the M3 Racing name in your pictures and text.

I was wondering if I can purchase a pair of Mag fork sliders that are un-machined as my son can do all of that work here and I would like to get one with my customer's project?

Mark

Mark

I will get a current price for the castings for you including the hire of the pattern and get back to you.

Cheers
Eric

RickB · « **Reply #774 on:** August 14, 2012, 06:03:02 PM »

Well this is exciting!

News:

Author Topic: The 1970 Daytona CR750s. (Read 269977 times)