Cafe Racer Forum banner

1 - 16 of 16 Posts

·
Registered
Joined
·
90 Posts
Discussion Starter #1
Hey all,

I am going over to the bike graveyard today and I am hoping to find some newer triple trees that will fit my 73 CB450. Anyone have any experience with this?

I really would love to get new forks too but I am not sure if there is a certain bike / year that will transfer over with little headaches.
 

·
Premium Member
Joined
·
1,645 Posts
K5 through K7 fit, if you find 2 non-cracked top clamps for cheap, pick me up one, won't you? <img src=icon_smile_big.gif border=0 align=middle>

checkout any online microfiche that lets you lookup that bike, here's one:

http://partsfinder.ridenow.com/fich...ry=Motorcycles&make=Honda&year=1973&fveh=2928

Be sure to check the top clamps carefully - they're aluminum, and if they've been overtightened, they'll crack. That's the problem I have...

*******************************************************
My own project:
http://www.caferacer.net/forum/topic.asp?TOPIC_ID=2827
*******************************************************
 

·
Registered
Joined
·
90 Posts
Discussion Starter #3
What about something from the 80's 90's? I would like to get some triple trees that were nicer and even some beefier forks.
 

·
Registered
Joined
·
1,112 Posts
Retrofitting modern parts on older generation bikes is tough sometimes. You're gonna find that steering head geometry (esp. concerning stem length and bearing sizes) is a pain. It can be done, just that most often its a matter of extensive fabrication and research or blind luck.

Deal with the triple tree and then when you start looking into forks, you've got a whole new barrel of monkeys on your hands (i.e. caliper mounts, brake rotor fit, wheel and axle fit, etc.)

Not that it can't be done. It helps to know a machinist and/or another whackjob who's already done it, though.

Honda go sideways!
 

·
Premium Member
Joined
·
1,645 Posts
The forks you (and I) have are 35mm forks, so theoretically, any 35mm fork will fit in the triple trees.

The problem is that you then introduce a couple of other issues:

* are the fork legs the same length? (they need to be)
* can you still use your old wheel and brake? (probably not)

I want nicer fork tubes than I have, but finding non-rusty ones is difficult, to say the least - but I hate to throw away all the other parts.

Discovolantemoto.co.uk sells new fork tubes, and is, even with currency conversion and shipping, probably the best deal.

I'd love for someone here to tell me that a different top clamp would fit, but the odds aren't very good, for all the reasons everyone else has pointed out.


*******************************************************
My own project:
http://www.caferacer.net/forum/topic.asp?TOPIC_ID=2827
*******************************************************
 

·
Registered
Joined
·
3,065 Posts
you can get new fork tubes much closer...

Forking by Frank
847 869 6792
much better than going overseas.

Try to fit a modern fork to the old beast without a LOT of time and machinery on hand will end up taking years to finish. Just like the one on the site you mention...

BORN TO LURK, FORCED TO WORK.
www.NYCvinMoto.com
www.VinMoto.org
 

·
Premium Member
Joined
·
1,645 Posts
You sure can, and they're 250 bucks a set, almost 70 bucks more than I'd pay for forks shipped from the UK. I actually called there first.

I also found a few places with online fiches that sell them for around 87 apiece, not including shipping, which is about what you'd pay from Disco Volante.



*******************************************************
My own project:
http://www.caferacer.net/forum/topic.asp?TOPIC_ID=2827
*******************************************************

Edited by - borzwazie on Jun 29 2007 10:27:46 PM
 

·
Registered
Joined
·
5,782 Posts
Maybe this needs to go into the FAQ section too.
Swapping front ends is not rocket science. It is simply a matter of matching up bearing sizes between the steering head on the frame and the steering stem on the triple clamps. Thee are 3 ways of going about this. You can either switch the steering stem from the old triple clamps into the new one and use the old bearings ( might involve grinding, machining and or welding and pressing) or use the new triple clamps and switch bearing sizes to fit both pieces or find a front end that uses the same bearing sizes and will bolt right up( stem length may be an issue).

So in the case of Marz's CB450 It uses bearing dimensions of 26x46x15 upper and 30x50x15 lower. Those are for tapered roller bearings from All-Balls(Dennis Kirk part # 121431) Looking at the application chart for that product number it also fits the 1980 CB650 (item # 130107185584 e-bay, 1980 CB650 forks and triple clamps $35.00) This should bolt right up. UNLESS, the stem is too long on the 650 in which case you might have to look at a spacer or combination of spacers to match everything up.

I am going to disagree with Borzwazie here. The forks do not need to be the same length. You can adjust lots of things after the fact to get what you want. Fork tubes can be slid up or down in the triple clamps and shock length can be changed to change ground clearance and steering angle too. This is an excellent chance to change the stance of your bike to meet your needs.

What are you going to do for wheels and brakes? You could go to dual discs with the 650 front end. Wire wheels? 19" = cb750sohc. Comstars = take your pick DOHC 750,900,1100. Cast 18" Lots of choices. E-bay and some research are your friend.

Ken

AHRMA 412
Vintage racing - old guys on old bikes
 

·
Premium Member
Joined
·
1,645 Posts
ken -

you're right, I was just oversimplifying.

Something that I'm working on now - it's not ready to show you guys yet, but I'm making a web app and database that will show which parts can be mixed and matched to other bikes, and what degree of difficulty that entails. it would be perfect for questions like this!

I gotta find hosting for this app...


*******************************************************
My own project:
http://www.caferacer.net/forum/topic.asp?TOPIC_ID=2827
*******************************************************
 

·
Registered
Joined
·
2,495 Posts
quote:
ken -

you're right, I was just oversimplifying.

Something that I'm working on now - it's not ready to show you guys yet, but I'm making a web app and database that will show which parts can be mixed and matched to other bikes, and what degree of difficulty that entails. it would be perfect for questions like this!

I gotta find hosting for this app...


*******************************************************
My own project:
http://www.caferacer.net/forum/topic.asp?TOPIC_ID=2827
*******************************************************
This is a great idea for a website. I can't wait until it is done.

Yeller'
---
Ask not what the wanker can do for you, but what you can do for your wanker!
 

·
Registered
Joined
·
90 Posts
Discussion Starter #13
quote:
Maybe this needs to go into the FAQ section too.
Swapping front ends is not rocket science. It is simply a matter of matching up bearing sizes between the steering head on the frame and the steering stem on the triple clamps. Thee are 3 ways of going about this. You can either switch the steering stem from the old triple clamps into the new one and use the old bearings ( might involve grinding, machining and or welding and pressing) or use the new triple clamps and switch bearing sizes to fit both pieces or find a front end that uses the same bearing sizes and will bolt right up( stem length may be an issue).

So in the case of Marz's CB450 It uses bearing dimensions of 26x46x15 upper and 30x50x15 lower. Those are for tapered roller bearings from All-Balls(Dennis Kirk part # 121431) Looking at the application chart for that product number it also fits the 1980 CB650 (item # 130107185584 e-bay, 1980 CB650 forks and triple clamps $35.00) This should bolt right up. UNLESS, the stem is too long on the 650 in which case you might have to look at a spacer or combination of spacers to match everything up.

I am going to disagree with Borzwazie here. The forks do not need to be the same length. You can adjust lots of things after the fact to get what you want. Fork tubes can be slid up or down in the triple clamps and shock length can be changed to change ground clearance and steering angle too. This is an excellent chance to change the stance of your bike to meet your needs.

What are you going to do for wheels and brakes? You could go to dual discs with the 650 front end. Wire wheels? 19" = cb750sohc. Comstars = take your pick DOHC 750,900,1100. Cast 18" Lots of choices. E-bay and some research are your friend.

Ken

AHRMA 412
Vintage racing - old guys on old bikes
Thanks for the help on this.

Although I do have fantasies of duel disks and inverted forks, the thing I really want at the moment is some nice(er) triple trees. If I could find some after market billet trees that were not break the bank expensive, that would be great. Or at least some that are more modern... the stock trees just seem kinda cheap and weak.

I will check out the 1980 CB650 trees and let you guys know.

I will keep my forks and brakes for now.



Edited by - marz on Jul 02 2007 2:24:09 PM
 

·
Registered
Joined
·
138 Posts
those stock trees are just fine....go get yerself some sandpaper(coarse to fine) and spend a saturday afternoon(or a monday night, whatever) and sand the hell outta it....then when its all clean and all the paint is off, take yer finest sandpaper and get it wet and sand it some more...and then some mor...then get yerself some Wenol polish and a steel wool pad and polish it.....polished aluminum looks tough. fuck billet. billet is for pussies. when yer finished with the triple trees you can now do the same thing with the lower end of the forks.....if yer fork tubes are rusty, take a piece of aluminum foil, ball it up, dunk it in water, and use it to take off and minor surface rust........or go spend 300 bucks and get billet trees, you can even get them in assorted colors like fkn popsickles.....www.mginproducts.com if you want something more modern, go buy something more modern, if not, you already have anything you need, cept maybe motivation.......
 

·
Registered
Joined
·
90 Posts
Discussion Starter #16
quote:
those stock trees are just fine....go get yerself some sandpaper(coarse to fine) and spend a saturday afternoon(or a monday night, whatever) and sand the hell outta it....then when its all clean and all the paint is off, take yer finest sandpaper and get it wet and sand it some more...and then some mor...then get yerself some Wenol polish and a steel wool pad and polish it.....polished aluminum looks tough. fuck billet. billet is for pussies. when yer finished with the triple trees you can now do the same thing with the lower end of the forks.....if yer fork tubes are rusty, take a piece of aluminum foil, ball it up, dunk it in water, and use it to take off and minor surface rust........or go spend 300 bucks and get billet trees, you can even get them in assorted colors like fkn popsickles.....www.mginproducts.com if you want something more modern, go buy something more modern, if not, you already have anything you need, cept maybe motivation.......
Great point, seeing as anything else is going to cost me a bundle in either time or money, but it never hurts to ask.

Just as a side note I was looking for a nicer, cleaner tree that was more durable than the cast stockers. I figure (as with most small but growing after markets) improved designs are not yet being cast so its either a match up or pu$$y billet.
 
1 - 16 of 16 Posts
Top