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how in the hell does this happen?

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hillhudson
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Location: Portland oregon

how in the hell does this happen?

Post by hillhudson » Wed May 06, 2015 1:38 am

'65 s90
'64 ca95 dream
'65 cb160
'66 cb77

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G-Man
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Post by G-Man » Wed May 06, 2015 5:40 am

Hill

I have heard that it is possible to run a TZ350 clutch by using an extended gearbox mainshaft. You obviously need a modified primary cover to keep the oil in.

http://home.comcast.net/~eholman/repspec.html

I acquired a CR72 primary cover a while back to look at how it was done by Honda back in the day. This one came up on UK eBay, rather surprisingly. It won't fit a CB72 engine but is very interesting.....

The other pictures of a gear primary conversion using a CB500 clutch drum with gear and the idler gear (actually a gear from a Honda gearbox) with mounting plate.

G
Attachments
002 Clutch compared.jpg
002 Clutch compared.jpg (188.17 KiB) Viewed 7318 times
001 Idler Gear.jpg
001 Idler Gear.jpg (202.25 KiB) Viewed 7323 times
CR72 Clutch 1.jpg
CR72 Clutch 1.jpg (179.62 KiB) Viewed 7326 times
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160
'66 Matchless 350 '67 CL77
'67 S90 '77 CB400F

hillhudson
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Joined: Tue Feb 15, 2011 9:19 pm
Location: Portland oregon

Post by hillhudson » Wed May 06, 2015 11:49 am

Oh man, thanks for the info! It might be nice toget that primary cover molded and replicated!
'65 s90
'64 ca95 dream
'65 cb160
'66 cb77

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G-Man
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Joined: Wed Mar 25, 2009 5:17 pm
Location: Derby, UK
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Post by G-Man » Wed May 06, 2015 12:28 pm

Hill

That's the plan. Typically Honda, all of the screw holes are in the wrong places, despite the fact that the original CR72 was based on a CB72 design. Last month I picked up a CR72 gear shift lever and linkage with some CB72 stuff so I'm edging ever closer.

It should be possible to come up with something based on that cover for a CB72. There have been a number done like the one you showed and Ellis Holman's. I think there is also something on Michael Moore's Eurospares site.

http://www.eurospares.com/graphic2.htm

G

hillhudson wrote:Oh man, thanks for the info! It might be nice toget that primary cover molded and replicated!
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160
'66 Matchless 350 '67 CL77
'67 S90 '77 CB400F

MBellRacing
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Location: San Mateo, Ca

Post by MBellRacing » Tue May 12, 2015 1:36 pm

So I MIGHT be working on a top secret project that is 100% unrelated to gasoline-powered motorcycles, but I have been making connections in the aluminum casting world. If someone could gather some [small] crowd funding for it, I'd love to invest some time in creating a new primary cover that accommodates the dry clutch. That would be my kind of project, with some help!

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G-Man
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Post by G-Man » Tue May 12, 2015 1:44 pm

I've used these guys, about 3 miles from me to do patterns for iron castings.

http://patternsderby.com/index.php/patt ... sting.html

Last time I visited they were repairing a quantity of cylinder head patterns for the Ford engine plant at Dagenham. There are plenty of people around here who do castings for Rolls Royce aerospace and Formula 1 teams.

This is going to be part of my CR72 replica......

G


MBellRacing wrote:So I MIGHT be working on a top secret project that is 100% unrelated to gasoline-powered motorcycles, but I have been making connections in the aluminum casting world. If someone could gather some [small] crowd funding for it, I'd love to invest some time in creating a new primary cover that accommodates the dry clutch. That would be my kind of project, with some help!
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160
'66 Matchless 350 '67 CL77
'67 S90 '77 CB400F

Airmun
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Location: East Coast Oz.

Post by Airmun » Tue May 12, 2015 4:14 pm

I have the patterns for the early type primary case. They may be modified to suit standard cases, I am not sure. The photos from a couple of posts ago will show the part.

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