« previous next »
Pages: [1]   Go Down

Author Topic: CB750 Crank Primary Teeth Worn - OK to Use?  (Read 3239 times)

0 Members and 1 Guest are viewing this topic.

Offline rickman750

  • Full Member
  • *
  • Posts: 97
CB750 Crank Primary Teeth Worn - OK to Use?
« on: December 27, 2014, 09:53:30 PM »
My cases are split, and we're in to scoping out the state. We've found the teeth on the primary drive sprocket are worn.

And now to my question - Is it usable? Or am I in for a replacement.

http://www.glasson.org/Pictures/nic750/Crank_primary_teeth.jpg
Logged

Offline goldarrow

  • one day, i'll be an
  • Old Timer
  • ******
  • Posts: 3,361
Re: CB750 Crank Primary Teeth Worn - OK to Use?
« Reply #1 on: December 27, 2014, 10:04:37 PM »
I would replace
Logged
Life Is Full Of Challenges - And My Backyard Is Full Of SOHC4's

CB550 K0
CB750 K0, K2, K23 JDM, K45, K5
And the little ones z50r, xr50r, st90


750k5 http://forums.sohc4.net/index.php?topic=114817.0

Offline Retro Rocket

  • Eggs are hard due too a
  • Really Old Timer ...
  • *******
  • Posts: 19,279
  • ROCK & ROLL
Re: CB750 Crank Primary Teeth Worn - OK to Use?
« Reply #2 on: December 27, 2014, 10:10:10 PM »
Yes, I wouldn't use that at all...
Logged
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Nic

  • Guest
Re: CB750 Crank Primary Teeth Worn - OK to Use?
« Reply #3 on: December 27, 2014, 10:35:11 PM »
Quote from: Retro Rocket on December 27, 2014, 10:10:10 PM
Yes, I wouldn't use that at all...
Mick, you know where to get a good one in Oz? I'm doing the job.
Logged

Offline Retro Rocket

  • Eggs are hard due too a
  • Really Old Timer ...
  • *******
  • Posts: 19,279
  • ROCK & ROLL
Re: CB750 Crank Primary Teeth Worn - OK to Use?
« Reply #4 on: December 27, 2014, 11:01:07 PM »
Quote from: Nic on December 27, 2014, 10:35:11 PM
Quote from: Retro Rocket on December 27, 2014, 10:10:10 PM
Yes, I wouldn't use that at all...
Mick, you know where to get a good one in Oz? I'm doing the job.

A replacement crank..?  I'll ask around Nic, I know a guy that may just have one..... ;)
Logged
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Nic

  • Guest
Re: CB750 Crank Primary Teeth Worn - OK to Use?
« Reply #5 on: December 27, 2014, 11:13:13 PM »
Quote from: Retro Rocket on December 27, 2014, 11:01:07 PM
Quote from: Nic on December 27, 2014, 10:35:11 PM
Quote from: Retro Rocket on December 27, 2014, 10:10:10 PM
Yes, I wouldn't use that at all...
Mick, you know where to get a good one in Oz? I'm doing the job.

A replacement crank..?  I'll ask around Nic, I know a guy that may just have one..... ;)
Appreciate it Mick, this engine needs everything, hadn't factored in a crank but when I found the primary chain tensioner was held in by about 3 threads and flapping around in there I wasn't surprised when I saw the state of the teeth. Someone has been in there, I found other loose bolts in the cam area as well.
Logged

Offline Retro Rocket

  • Eggs are hard due too a
  • Really Old Timer ...
  • *******
  • Posts: 19,279
  • ROCK & ROLL
Re: CB750 Crank Primary Teeth Worn - OK to Use?
« Reply #6 on: December 28, 2014, 12:29:28 AM »
I've made a couple of phone calls, no luck yet, i'll keep trying though... ;)
Logged
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Nic

  • Guest
Re: CB750 Crank Primary Teeth Worn - OK to Use?
« Reply #7 on: December 28, 2014, 01:10:55 AM »
Thanks Mick, they have plenty in the states but $200 shipping ::)
Logged

Offline Retro Rocket

  • Eggs are hard due too a
  • Really Old Timer ...
  • *******
  • Posts: 19,279
  • ROCK & ROLL
Re: CB750 Crank Primary Teeth Worn - OK to Use?
« Reply #8 on: December 28, 2014, 01:59:18 AM »
Nic, you are in Sydney aren't you..?  Try giving these guys a ring, they do hot Honda engines and may just have a crank lying around...I'll keep looking... ;)

http://www.robinsontoolmakers.com.au/big_bore.htm
Logged
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Nic

  • Guest
Re: CB750 Crank Primary Teeth Worn - OK to Use?
« Reply #9 on: December 28, 2014, 03:10:07 AM »
I'm closer to Canberra mate but I'll give em a ring, thanks, I'll let you know how I go.
Logged

Nic

  • Guest
Re: CB750 Crank Primary Teeth Worn - OK to Use?
« Reply #10 on: December 28, 2014, 05:54:01 PM »
Replacement crank acquired, thanks Mick for your help.
Logged

Offline Retro Rocket

  • Eggs are hard due too a
  • Really Old Timer ...
  • *******
  • Posts: 19,279
  • ROCK & ROLL
Re: CB750 Crank Primary Teeth Worn - OK to Use?
« Reply #11 on: December 28, 2014, 06:55:32 PM »
Quote from: Nic on December 28, 2014, 05:54:01 PM
Replacement crank acquired, thanks Mick for your help.

Excellent... ;)
Logged
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline SOHC4 Cafe Racer Fan

  • Speak up, Whipper-Snapper! I'm a
  • Really Old Timer ...
  • *******
  • Posts: 15,731
  • SOHC/4 Member #1235
Re: CB750 Crank Primary Teeth Worn - OK to Use?
« Reply #12 on: December 28, 2014, 07:07:01 PM »
GREAT!!  ;D
Logged
1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline 750cafe

  • Hot Shot
  • ***
  • Posts: 607
Re: CB750 Crank Primary Teeth Worn - OK to Use?
« Reply #13 on: December 28, 2014, 07:54:01 PM »
WTG Retro!  :D

Eric
Logged
Is there anything more fun than riding? They are between your legs and are quiet when you turn them off.

Nic

  • Guest
Re: CB750 Crank Primary Teeth Worn - OK to Use?
« Reply #14 on: December 28, 2014, 08:21:36 PM »
Ah yes well, actually, the crank was got from, ebay in the states.
Logged

Offline 750cafe

  • Hot Shot
  • ***
  • Posts: 607
Re: CB750 Crank Primary Teeth Worn - OK to Use?
« Reply #15 on: December 28, 2014, 08:23:50 PM »
He tried to help anyway.  ;) :-[
How much/little did you have to shell out for it with shipping?

Eric
Logged
Is there anything more fun than riding? They are between your legs and are quiet when you turn them off.

Nic

  • Guest
Re: CB750 Crank Primary Teeth Worn - OK to Use?
« Reply #16 on: December 28, 2014, 08:42:17 PM »
Quote from: 750cafe on December 28, 2014, 08:23:50 PM
He tried to help anyway.  ;) :-[
How much/little did you have to shell out for it with shipping?

Eric
Too much.
Logged

Offline rickman750

  • Full Member
  • *
  • Posts: 97
Re: CB750 Crank Primary Teeth Worn - OK to Use?
« Reply #17 on: December 28, 2014, 11:55:58 PM »
Quote from: Nic on December 28, 2014, 08:42:17 PM
Quote from: 750cafe on December 28, 2014, 08:23:50 PM
He tried to help anyway.  ;) :-[
How much/little did you have to shell out for it with shipping?

Eric
Too much.
Seventy bucks........US........Plus shipping.

Now I'm worried about the big primary sprocket on the tranny input shaft......
Logged

Nic

  • Guest
Re: CB750 Crank Primary Teeth Worn - OK to Use?
« Reply #18 on: December 29, 2014, 12:26:43 AM »
Quote from: rickman750 on December 28, 2014, 11:55:58 PM
Quote from: Nic on December 28, 2014, 08:42:17 PM
Quote from: 750cafe on December 28, 2014, 08:23:50 PM
He tried to help anyway.  ;) :-[
How much/little did you have to shell out for it with shipping?

Eric
Too much.
Seventy bucks........US........Plus shipping.

Now I'm worried about the big primary sprocket on the tranny input shaft......
Worry not, I have inspected.
Logged
Pages: [1]   Go Up
« previous next »