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CB72 Vintage Racer

CYP77 - Police | Race Bikes | Choppers, Bobbers and Mods
jerry
honda305.com Member
Posts: 173
Joined: Tue Feb 19, 2008 2:33 pm
Location: australia

Post by jerry » Fri Nov 09, 2012 2:54 pm

Dear Jensen, I wonder what became of the bikes he built. Are they still involved in racing? All the best Jerry

jensey
honda305.com Member
Posts: 384
Joined: Sun Jun 17, 2012 3:34 am
Location: Netherlands

Post by jensey » Fri Nov 09, 2012 5:43 pm

Hi jerry,

The 5 speed primary gear driven bike was for sale a few years ago,
I saw it (and touched it), and saw how the engines were build.

I also noticed that he build and used his own designed and made cam followers with a bearing were it touches the cam. I don't know if he made his own cams.

I think he used cranks, build up from CB450 and CB72, I saw he did change the stroke by having and off axis big end pin.

He never took notes of what he was doing, no drawings, no nothing.

It's said that all that knowledge is gone,

jensen
assembly of Japanese motorcycles requires great peace of mind (Pirsig)

jerry
honda305.com Member
Posts: 173
Joined: Tue Feb 19, 2008 2:33 pm
Location: australia

Post by jerry » Fri Nov 09, 2012 6:57 pm

Dear Jensen, I suppose all things come to an end eventually. Even I sold the 2 race Bikes in June. All the best Jerry

GORDON BROWN
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Posts: 150
Joined: Wed Oct 27, 2010 12:36 pm
Location: edinburgh scotland

race part pictures.

Post by GORDON BROWN » Sun Nov 11, 2012 2:20 pm

Hello everyone

Jensey, I think it was George Flick's bike that had a extra lever on the L/H bar to engage gear, it was back in the old push start days and he just pushed the bike in neutral ( a lot less drag) then just "dropped" it into gear once moving, simple but clever !

The pictures below are,
1) The cam chain tensioner setup I had used, steel centre roller made by a friend and a toothed type tensioner ( CB450 or Kawasaki ? cant remember )
2) A gear drive setup from a article in Clubman magazine.
I think I should give the slipper idea another try as it looks a lot simpler than the above.

Back to the workshop then.

Gordon
SAFOJ
Attachments
CL GEAR DRIVE.jpg
cb72 61 case small.jpg

User avatar
G-Man
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Posts: 5641
Joined: Wed Mar 25, 2009 5:17 pm
Location: Derby, UK
Contact:

Post by G-Man » Sun Nov 11, 2012 2:44 pm

Gordon

Thanks for posting those. The gear drive looks good. Are those oil pump gears top and bottom or specials?

G
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160
'66 Matchless 350 '67 CL77
'67 S90 '77 CB400F

GORDON BROWN
honda305.com Member
Posts: 150
Joined: Wed Oct 27, 2010 12:36 pm
Location: edinburgh scotland

race parts

Post by GORDON BROWN » Wed Nov 14, 2012 4:23 pm

Hello

G-Man, the gears are a conversion to replace the filter drive chain, it was supplied by Dennis Murfin / Peter Maddox who ran M&M racing. They also supplied the vernier cam sprocket in the picture along with the ASSO 350 pistons, O.S. valves and other parts.
Dennis still advertises in the VJMC magazine but I dont know what he still has available.
I dont know if the filter chains had given any problems but it does mean you can get the filter in and out easier.

Stan, finaly got a look at your photobucket stuff, great workshop and racing shots. Hope you enjoy getting the 72 back out on track, what are the cut off dates for the class you will run it in and are they generaly competive in the class ?

Gordon

SAFOJ

Airmun
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Posts: 27
Joined: Sun May 29, 2011 2:44 am
Location: East Coast Oz.

Post by Airmun » Thu Nov 15, 2012 10:37 pm

Hello Gordon. Was Dennis also the maker of the gear cam drive?

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