ADVrider

Go Back   ADVrider > Bikes > Hacks
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 09-25-2012, 12:15 PM   #16
Prutser
Studly Adventurer
 
Prutser's Avatar
 
Joined: Aug 2012
Location: The Dutch swamp
Oddometer: 914
Quote:
Originally Posted by MotoJ View Post
I've heard this can happen, but just takes a pull on the lever to correct them again.

Any pics you could post? Was the steering improved over stock?
The steering is great.(even without a steeringdamper ) And I knew the fork would be a bit to weak. But its my winter ride not my winter racer
The first time I touch the brake its just a bit deeper. I don't need to pump to have a working brake again.

This is my setup.


Still thinking about making a 25mm axle fit this swingarm.
__________________
BMW R100'91/R80'93/R75/6 R80ST'83/R65GS'87/GasGasTXT300/DouglasW20-1920

R100GS'91 (sold)
Prutser is offline   Reply With Quote
Old 09-25-2012, 01:25 PM   #17
NitroMax
Studly Adventurer
 
NitroMax's Avatar
 
Joined: May 2010
Location: Netherlands, Europe
Oddometer: 649
Ziet er goed uit voor een Prutser



Sorry guys, just teasing a fellow countryman
__________________
1300cc 217Nm/207Hp NOS-injected VMax (1985)
500 cc 1950 BSA chopper (1983)
750 cc CB750 chopper ( 1990)
1200 cc Z1000 dragbike (1976)
300 cc MZ transporthack (1989) winterhack
900 cc BMW R 90/6 hack ( 1976) summerhack
750 cc BMW K 75 RT ( 1993 ) daily driver

Age is an issue of mind over matter. If you don't mind, it doesn't matter ( Mark Twain )
NitroMax is offline   Reply With Quote
Old 09-25-2012, 01:51 PM   #18
Prutser
Studly Adventurer
 
Prutser's Avatar
 
Joined: Aug 2012
Location: The Dutch swamp
Oddometer: 914
Quote:
Originally Posted by NitroMax View Post
Ziet er goed uit voor een Prutser



Sorry guys, just teasing a fellow countryman

Dank je
__________________
BMW R100'91/R80'93/R75/6 R80ST'83/R65GS'87/GasGasTXT300/DouglasW20-1920

R100GS'91 (sold)
Prutser is offline   Reply With Quote
Old 09-25-2012, 02:18 PM   #19
MotoJ
Mobtown Hacker
 
MotoJ's Avatar
 
Joined: Apr 2011
Location: Baltimore
Oddometer: 1,081
Sweet!
Did you have to modify the upper shock mounts or are those cartridge shocks the correct length? What make are those shocks?
Also, did you move the rear brace up, or just eliminate it>? It's hard to see in the photo.
__________________
The ladies used to check me out...now they just keep an eye on me.
MotoJ is offline   Reply With Quote
Old 09-25-2012, 02:46 PM   #20
Prutser
Studly Adventurer
 
Prutser's Avatar
 
Joined: Aug 2012
Location: The Dutch swamp
Oddometer: 914
Quote:
Originally Posted by MotoJ View Post
Sweet!
Did you have to modify the upper shock mounts or are those cartridge shocks the correct length? What make are those shocks?
Also, did you move the rear brace up, or just eliminate it>? It's hard to see in the photo.
I didn't have to modify the shock mounts. The shocks are custom build to suit this fork.

When I bought the fork it was a wreck. The stem was messed up. The brace was bent and made from sheet metal.
I took it all out and made a new brace. Changed the head bearing size to something bigger than the original bicycle size.





__________________
BMW R100'91/R80'93/R75/6 R80ST'83/R65GS'87/GasGasTXT300/DouglasW20-1920

R100GS'91 (sold)
Prutser is offline   Reply With Quote
Old 09-29-2012, 10:34 AM   #21
bmwhacker
Still on 3 wheels
 
bmwhacker's Avatar
 
Joined: May 2009
Location: MONTANA NATIVE from NATIVE MONTANA
Oddometer: 4,136
Quote:
Originally Posted by MotoJ View Post
Sounds like the axle or swingarm spindle twist on the 69S Earles, and maybe the forks were twisting on Ivan's Retro.
The common denominator is the caliper mounts themselves. Maybe they were flexing on both setups.


Where's BMWHacker? Does your setup lose pressure under hard-turning stress?

WOW great work on the fork fabrication!!!!!!! Wish I had the skill / equipment to build something like that.


No brake pressure loss that I've ever noticed. The Suzuki calipers are mounted underneath. The front end I have was modified by some dude in the Bay Area eons ago, so I was told. I wasn't too sure how it would work but no regrets.

My front end has got a little squirrly a couple times especially if there were irregularities in the road, but nothing memorable. I remember thinking: "note to self...don't go into bumpy unknown corners so hot".
After a lot of miles with a conventional front end, and then on an Earls, I definately love the Earls. A lot less work and no front dive under heavy braking. I have Progressive shocks in the front, set on the lower end. It is somewhat harsh on rough roads but is stable.






I dissected the bike last winter for a new clutch assembly / rear main / head rebuild / timing chain.
Now my final drive / wheel hub splines are getting worn, so that's next. Those things happen when you work a rig as hard as we do!
The original builder hacked off the additional support member midway up the fork. I've bolted in another axle shaft in the rear swingarm mount to help reinforce things. I need to weld in another brace (someday) like the OP has on his.
__________________
http://555navigator.blogspot.com

Living proof you shouldn't play with matches
ABC# 1992

bmwhacker screwed with this post 09-29-2012 at 10:50 AM
bmwhacker is offline   Reply With Quote
Old 10-17-2012, 05:43 AM   #22
MotoJ
Mobtown Hacker
 
MotoJ's Avatar
 
Joined: Apr 2011
Location: Baltimore
Oddometer: 1,081
BMWHacker,

Do you have any close-up shots of the caliper mounts? Did you just weld tabs to the bottom of the swingarm?
I'm trying to decide the best way to hang my calipers- fixed to the swingarm, or floating brackets on the axle, with brake stays, like Prutser's bike.

I'm kinda worried welding on the swingarm might create a stress riser. I suppose if I keep all the welds parallel with the arm that would help eliminate that. Somewhere in Hacks I saw a photo of leading links on a K bike broken right above a weld made perpendicular to the downtubes.

Am I being a worrywart?
__________________
The ladies used to check me out...now they just keep an eye on me.
MotoJ is offline   Reply With Quote
Old 10-23-2012, 08:23 PM   #23
bmwhacker
Still on 3 wheels
 
bmwhacker's Avatar
 
Joined: May 2009
Location: MONTANA NATIVE from NATIVE MONTANA
Oddometer: 4,136
Quote:
Originally Posted by MotoJ View Post
BMWHacker,

Do you have any close-up shots of the caliper mounts? Did you just weld tabs to the bottom of the swingarm?
I'm trying to decide the best way to hang my calipers- fixed to the swingarm, or floating brackets on the axle, with brake stays, like Prutser's bike.

I'm kinda worried welding on the swingarm might create a stress riser. I suppose if I keep all the welds parallel with the arm that would help eliminate that. Somewhere in Hacks I saw a photo of leading links on a K bike broken right above a weld made perpendicular to the downtubes.

Am I being a worrywart?

Photo was taken early on before I mounted the Lester Wheels....tabs welded into place.
The front end had some serious welding / modifications before coming to me. All the welds looked good though.
I was real cautious riding for the first few thousand miles but all is well after 3 years of hard use.




As found:
__________________
http://555navigator.blogspot.com

Living proof you shouldn't play with matches
ABC# 1992

bmwhacker screwed with this post 10-23-2012 at 08:30 PM
bmwhacker is offline   Reply With Quote
Old 10-23-2012, 09:37 PM   #24
bmweuro
Mad Scientist
 
bmweuro's Avatar
 
Joined: Nov 2003
Location: Chico, California
Oddometer: 3,343
Quote:
Originally Posted by NitroMax View Post
That's some nice info, thanks.

I had been looking at one of those early Earles forks but only heard they were too weak for the sidecaruse on a later model Beemer ( mine's a R 90/6 ).
If the /2 was designed for sidecar use how can that be true? The answer is - it works just fine.
__________________
BOXER Metal
BMW Biker Scum
BMW Mad Scientist!
VBMWMO #7770, BMW MOA #48694 & Airhead BMW Club #600
bmweuro is online now   Reply With Quote
Old 10-23-2012, 09:42 PM   #25
bmweuro
Mad Scientist
 
bmweuro's Avatar
 
Joined: Nov 2003
Location: Chico, California
Oddometer: 3,343
Here is my /2 leading link on a /6 frame.



__________________
BOXER Metal
BMW Biker Scum
BMW Mad Scientist!
VBMWMO #7770, BMW MOA #48694 & Airhead BMW Club #600
bmweuro is online now   Reply With Quote
Old 10-23-2012, 10:05 PM   #26
villageidiot
Beastly Adventurer
 
Joined: Apr 2010
Location: Orange County, CA
Oddometer: 1,301
In making a leading link fork for a bmw, how much further forward does the axle center move?

I know the idea is to reduce trail, so the wheel needs to go forward, is there an exact amount, or is it something like "just move it forward an inch"
villageidiot is offline   Reply With Quote
Old 10-23-2012, 10:32 PM   #27
bmweuro
Mad Scientist
 
bmweuro's Avatar
 
Joined: Nov 2003
Location: Chico, California
Oddometer: 3,343
From 0-2" max.
__________________
BOXER Metal
BMW Biker Scum
BMW Mad Scientist!
VBMWMO #7770, BMW MOA #48694 & Airhead BMW Club #600
bmweuro is online now   Reply With Quote
Old 10-24-2012, 07:03 AM   #28
MotoJ
Mobtown Hacker
 
MotoJ's Avatar
 
Joined: Apr 2011
Location: Baltimore
Oddometer: 1,081
Quote:
Originally Posted by bmweuro View Post
If the /2 was designed for sidecar use how can that be true? The answer is - it works just fine.
I don't know what the wall thicknesses are for each or tensile strength ratings, etc., but I have held both a Unit set (with shocks and calipers) and an old Earles forks set (shocks only), and the Earles were heavier. Might not mean anything, but they are beefier than they look like in photos...
__________________
The ladies used to check me out...now they just keep an eye on me.
MotoJ is offline   Reply With Quote
Old 10-24-2012, 03:54 PM   #29
Prutser
Studly Adventurer
 
Prutser's Avatar
 
Joined: Aug 2012
Location: The Dutch swamp
Oddometer: 914
Quote:
Originally Posted by bmweuro View Post
Here is my /2 leading link on a /6 frame.



Nice bike !!

Don't you mind that the front wil lift when you use the brake ?
__________________
BMW R100'91/R80'93/R75/6 R80ST'83/R65GS'87/GasGasTXT300/DouglasW20-1920

R100GS'91 (sold)
Prutser is offline   Reply With Quote
Old 10-24-2012, 04:03 PM   #30
bmweuro
Mad Scientist
 
bmweuro's Avatar
 
Joined: Nov 2003
Location: Chico, California
Oddometer: 3,343
Quote:
Originally Posted by Prutser View Post
Nice bike !!

Don't you mind that the front wil lift when you use the brake ?

Thanks. No I don't mind. It seems like the front end lifting is putting more pressure on the front tire vs, having a floating caliper which just skids under hard braking.
__________________
BOXER Metal
BMW Biker Scum
BMW Mad Scientist!
VBMWMO #7770, BMW MOA #48694 & Airhead BMW Club #600
bmweuro is online now   Reply With Quote
Reply

Share

Thread Tools Search this Thread
Search this Thread:

.
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


Times are GMT -7.   It's 03:38 AM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014