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Author Topic: Jared's 1982 CM450C Cafe Project  (Read 24556 times)

Offline jaredc7

  • Posts: 60
  • Get busy living.
Jared's 1982 CM450C Cafe Project
« on: Dec 02, 2013, 18:04:43 »
Hey everyone! After pouring over countless posts from you all (extremely helpful) and getting a few books to learn on my own, I've finally started a cafe rebuild for my motorcycle. Just started to tear into it a couple weeks ago, and trying to only focus on one problem at a time. I'me sure you all know how overwhelming it can be trying to do multiple things at once! Here is what I'm working with...

1982 Honda CM450C
Purchased April 2013, and rode it most of the summer
About 22k miles

Goals for Cafe Rebuild
- Single swing arm conversion
- Monoshock conversion
- Old styling with modern performance parts

I'm already into a couple issues and expect some custom fabrication. I'm looking forward to hearing a variety of thoughts and ideas from this forum!
Jared

1982 Honda CM450 C

Offline jaredc7

  • Posts: 60
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Re: Jared's 1982 CM450C Cafe Project
« Reply #1 on: Dec 02, 2013, 18:07:07 »
Here are some pics of the tear down process
Jared

1982 Honda CM450 C

Offline jaredc7

  • Posts: 60
  • Get busy living.
Re: Jared's 1982 CM450C Cafe Project
« Reply #2 on: Dec 02, 2013, 18:08:48 »
Final pics of the tear-down...
Jared

1982 Honda CM450 C

Offline jaredc7

  • Posts: 60
  • Get busy living.
Re: Jared's 1982 CM450C Cafe Project
« Reply #3 on: Dec 02, 2013, 18:28:59 »
I got in the single swing arm from a 1990 Honda Hawk NT650. It was by far the best option for a single swing arm for my 450CC bike. Here are some details...

Honda CM450C
1 - Swing arm pivot diameter: 14mm
2 - Distance between inside edges of swing arm (or width of swing arm pivot at frame): 5 and 5/16" (roughly)
3 - Distance between pivot rod CL and rear axle CL: 20"

Honda Hawk NT650
1 - Swing arm pivot diameter: 15mm
2 - Distance between inside edges of swing arm: 5-3/8"
3 - Distance between pivot rod CL and rear axle CL: 21-3/8"

Some other swing arms I considered...
- VFR800 Interceptor - 20mm, 6-7/8" wide (10.75" wide at outside edges)
- VFR750 Interceptor - 20mm, 247mm wide, 570mm long
- Variety of Ducati and Triumph brands... pretty much ALL other single swing arms have a 20mm diamter pivot shaft.

Since the Honda Hawk NT650 is the closest in dimesions, as well as overall bike size, the choice was easy. Now to get the damn thing to fit!!!
Jared

1982 Honda CM450 C

Offline jaredc7

  • Posts: 60
  • Get busy living.
Re: Jared's 1982 CM450C Cafe Project
« Reply #4 on: Dec 02, 2013, 18:36:36 »
Here's my thoughts to get this swing arm to work. Any thoughts here would be greatly appreciated.

- Remove rear tube section of frame so left side of swing arm is clear to move.
- Cut out existing pivot rod housing from CM450 frame
- Cut out pivot rod housing from a Hawk NT650
- Weld in NT650 pivot rod housing into CM450 frame, moving the centerline about 3/4" farther to the rear so swing arm clears transmission case.

Questions!!!
- Will I need some additional reinforcement here when welding in the new pivot rod housing?
- Should I get a monoshock and fab/install the top mount where it should go to accommodate that shock?  -  OR  -  Weld in the monoshock top mount where it "should" be, for structural integrity, and size the monoshock for that specific application?
Jared

1982 Honda CM450 C

Offline 1969Honda

  • Posts: 296
Re: Jared's 1982 CM450C Cafe Project
« Reply #5 on: Dec 03, 2013, 06:21:10 »
Do you have the rear wheel and sprocket carrier in hand yet? If not you'll want that in hand first to see where your sprockets line up and what will be required to center the wheel and line it up with the front.  Once you get those figured out post up some pics with them installed and I'm sure some of the more talented and experienced builders (teazer, bradj, sonreir, crazypj, von yinzer, etc...) on here will offer up their 2 cents
"Life happens, you'll either get over it or die from it"

Offline jaredc7

  • Posts: 60
  • Get busy living.
Re: Jared's 1982 CM450C Cafe Project
« Reply #6 on: Dec 04, 2013, 21:50:44 »
I do not have a rear wheel and sprocket carrier. I am looking at some different wheels that will work with the Hawk NT650, including the Interceptor VFR 750 and 800. Not really a big fan of the stock NT650 wheels. The VFR models have the same design of single swing arm.

One thing I realized is that the Hawk's frame mounts to the outside of the single swing arm, so there is no "pivot housing" I can steal from the Hawk. For my 1982 CM450, the swing arm will have to straddle the frame (as you can see in the pics). Very different! It may take some extra work to line up the front and rear, but since I will be modifying my existing swing arm pivot anyways (for clearance with the right side of the transmission case), I'll be able to move it anywhere I need to. Not to say it won't take some finesse!

Jared

1982 Honda CM450 C

Offline jaredc7

  • Posts: 60
  • Get busy living.
Custom Fab: monoshock top mount
« Reply #7 on: Dec 11, 2013, 12:09:31 »
Here are a couple CONCEPT drawings showing some options for the custom monoshock top mount. Let me know what you think, or if there are other/better options out there!

I will be using the rear shock off of a 2009 CBR600 RR. From all the people I've talked too, this seemed to be the best and most economical approach... Unless someone has a spare YSS, Wilber, or Ohlins shock lying around??? hahaha. I bought the CBR600 RR shock for $50 on eBay.
Jared

1982 Honda CM450 C

Offline jaredc7

  • Posts: 60
  • Get busy living.
Re: Jared's 1982 CM450C Cafe Project
« Reply #8 on: Dec 11, 2013, 12:12:06 »
I know the orientation/perspective is off on these, but they are just concept drawings...

The yellow lines are welds visible from that particular persepective, and the red lines are welds behind the material.

Maybe option 2 could be bolted on instead of welded? Just exploring options, I think I would prefer welds here.

Let me know what you think!

Thanks,
Jared
Jared

1982 Honda CM450 C

Offline 1969Honda

  • Posts: 296
Re: Jared's 1982 CM450C Cafe Project
« Reply #9 on: Dec 11, 2013, 12:55:45 »
The rvf400 rears can be put on that swing arm with the corresponding eccentric and axle set up and a little modding to the brake system mounts if you want an 18x4.5 rear wheel.  You might even be able to go for the NSR250R single nut rear wheels as well, not sure just some of the different routes I've been researching.  In a couple months I'll be back home and have access to all of the eccentric and wheel dimension for SSSAs that I have been collecting for awhile.  If you need further measurements and fitments for wheels and the swing arm check out www.customfighters.com, there's tons of swap information for the NT650/VFR swing arms.
"Life happens, you'll either get over it or die from it"