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Author Topic: Re: Scott's 1974 CB360 project- She is alive!!  (Read 60146 times)

Offline crazypj

  • Posts: 13451
  • Split personality, I fake being smart
Re: Scott's 1974 CB360 project- She is alive!!
« Reply #240 on: Oct 24, 2018, 20:12:17 »
Nice. Probably lighter than original 33mm tubes as well, lot more was done on computers when VTR was made so uses thin-wall tubes, probably 3mm instead of 3/16"and more precise castings for sliders.
'you can take my word for it or argue until you find out I'm right'
Best thing I ever overheard
"yep, PJ's my boss, he taught me everything I know, just didn't teach me everything he knows"
Brian Morgan, 1982

CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline SpottheDogg

  • Posts: 242
Re: Scott's 1974 CB360 project- She is alive!!
« Reply #241 on: Oct 24, 2018, 20:21:57 »
You’re right, thanks, they are 33mm  :)

Offline SpottheDogg

  • Posts: 242
Re: Scott's 1974 CB360 project- She is alive!!
« Reply #242 on: Oct 24, 2018, 20:26:41 »
Nice. Probably lighter than original 33mm tubes as well, lot more was done on computers when VTR was made so uses thin-wall tubes, probably 3mm instead of 3/16"and more precise castings for sliders.

CrazyPJ, you probably know some specs on the CB360 steerer. When I put the CB-1 front end on my VTR250 I had to use the VTR steer tube, aparently the CB-1 had a very common Honda steerer where the VTR had an uncommon one. I still have the CB-1 steer tube and I’m hoping maybe I can just press that into my VTR250 triple if it’s correct for the CB360. I can always remove the tube from my CB lower, but it would be nice to have a complete 360 front end. Maybe I can sell it 😊

Offline SpottheDogg

  • Posts: 242
Re: Scott's 1974 CB360 project- She is alive!!
« Reply #243 on: Oct 25, 2018, 13:16:02 »
Ok, updates for anyone wanting to do this swap:
1. you’ll need to space the caliper in, two spacers id, 8mm, od 18mm, L 7mm and get two M8x1.25 40mm long bolts.
2. you need to ovalize two of the six rotor bolt holes slightly to get the stock long bolts through. Then you’ll want to drill four new holes based on the 6 bolt rotor pattern, tap them 8x1.25 and buy four bolts 15-20mm long.
3. you’ll need two new axle spacers (this does not accommodate speedo drive) id 15mm, od 22mm, Length for right side 25mm, length for left side 21mm. You need to remove the VTR250 speedometer drive stop on the fork leg (or at least shorten it a couple mm).
4. You will need a steer tube donor.
« Last Edit: Oct 25, 2018, 13:38:59 by SpottheDogg »

Offline crazypj

  • Posts: 13451
  • Split personality, I fake being smart
Re: Scott's 1974 CB360 project- She is alive!!
« Reply #244 on: Oct 25, 2018, 15:15:00 »
CrazyPJ, you probably know some specs on the CB360 steerer. When I put the CB-1 front end on my VTR250 I had to use the VTR steer tube, aparently the CB-1 had a very common Honda steerer where the VTR had an uncommon one. I still have the CB-1 steer tube and I’m hoping maybe I can just press that into my VTR250 triple if it’s correct for the CB360. I can always remove the tube from my CB lower, but it would be nice to have a complete 360 front end. Maybe I can sell it 😊
For alloy bottom yoke you need around 0.003"~0.004" interference fit for a press in stem. If it's forged steel, you can be a little looser but will need to weld it in. Are all steerer tubes steel? Swapping to 'standard Honda' bearing sizes is a real good idea
'you can take my word for it or argue until you find out I'm right'
Best thing I ever overheard
"yep, PJ's my boss, he taught me everything I know, just didn't teach me everything he knows"
Brian Morgan, 1982

CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline SpottheDogg

  • Posts: 242
Re: Scott's 1974 CB360 project- She is alive!!
« Reply #245 on: Oct 25, 2018, 21:44:27 »
I checked it out today, the CB uses the alternate length tube so I ground the weld off and pressed in the spare steer tube I had in my bin. Will have it welded in this week. Looks like I can probably use my CB360 fender with a little creativity.  :)
« Last Edit: Oct 25, 2018, 21:46:10 by SpottheDogg »

Offline SpottheDogg

  • Posts: 242
Re: Scott's 1974 CB360 project- She is alive!!
« Reply #246 on: Oct 25, 2018, 22:01:10 »
Here’s a recent picture of me on the VTR250 and also the 1989 Hawk GT I just acquired in August.


Offline SpottheDogg

  • Posts: 242
Re: Scott's 1974 CB360 project- She is alive!!
« Reply #247 on: Oct 25, 2018, 22:02:36 »
Sorry, here’s the Hawk GT, it has RC30 bodywork. It has been a race bike for over twenty years, it works very well but I’ve be modding it further.
« Last Edit: Oct 25, 2018, 22:06:14 by SpottheDogg »

Offline crazypj

  • Posts: 13451
  • Split personality, I fake being smart
Re: Scott's 1974 CB360 project- She is alive!!
« Reply #248 on: Oct 26, 2018, 21:37:45 »
I heard cranks fail big time on the Hawk if you go over 80bhp? The offset crankpin shears although I couldn't find out if it was torque  or rpm causing it?
'you can take my word for it or argue until you find out I'm right'
Best thing I ever overheard
"yep, PJ's my boss, he taught me everything I know, just didn't teach me everything he knows"
Brian Morgan, 1982

CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline SpottheDogg

  • Posts: 242
Re: Scott's 1974 CB360 project- She is alive!!
« Reply #249 on: Oct 26, 2018, 23:25:21 »
I believe it’s extended high RPM, I am not over 75HP and our long straight is maybe 400m.