ADVrider

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

Reply
 
Thread Tools Search this Thread Display Modes
Old 02-25-2009, 03:27 PM   #61
Readymeal
Gnarly Adventurer
 
Joined: Nov 2006
Location: Townsville, NQ
Oddometer: 113
i do have the copper ring thingy to adjust the bearings though... i think it only works for later GS... let me know wRanker :)
__________________
94 BMW R100GSPD
79 Suzuki GS750 black 4 in 2
81 Yamaha XT 540
Readymeal is offline   Reply With Quote
Old 02-25-2009, 04:33 PM   #62
lockyv7
dont wish it, do it.
 
lockyv7's Avatar
 
Joined: Oct 2005
Location: Sunshine Coast Australia, There is no winter here.
Oddometer: 995
There a Michelin Sirac 120 x 18 rear and a 100 x 18 rear mounted on the front. Locky.

Quote:
Originally Posted by ricard
What a beaut! Can you tell me about those tires? Who makes them and is that an 18" or 19" front? Thanks
lockyv7 is offline   Reply With Quote
Old 02-26-2009, 04:15 PM   #63
Airhead Wrangler OP
Adios Mexico
 
Airhead Wrangler's Avatar
 
Joined: Mar 2008
Location: Back in Seattle, FINALLY
Oddometer: 6,202
Bgood, you mentioned (I think in your thread) something about flipping your rear brake over. Can anyone tell me how exactly does one go about doing that on a G/S or ST? Is it as straight forward as just pulling the arm off and flipping it over?
__________________
R80ST Gets The HPN Treatment
Seattle to TDF on an airhead

Current rides: HPN #834, '93 R100GSPD "red rocket", '73 R75/5 Toaster mongrel, '80 Ducati Pantah 500SL, '92 DR350, '67 Honda SS50, '80 Honda Chaly.
Airhead Wrangler is online now   Reply With Quote
Old 02-26-2009, 04:26 PM   #64
SOLO LOBO
airhead or nothing
 
SOLO LOBO's Avatar
 
Joined: Mar 2004
Location: Shoreline, WA
Oddometer: 8,336
Quote:
Originally Posted by Airhead Wrangler
Bgood, you mentioned (I think in your thread) something about flipping your rear brake over. Can anyone tell me how exactly does one go about doing that on a G/S or ST? Is it as straight forward as just pulling the arm off and flipping it over?
I think you need to replacethe cam... don't know for sure but when I picked up my bike the rear brake didn't work for shit, and looked like this...



Looking back, my bike was sure ugly when I got it!
__________________
"punkrocks what it's all about" - J. Strummer



Quote:
Originally Posted by Stagehand
your bike is suitably dirty. Well done.
SOLO LOBO is offline   Reply With Quote
Old 02-26-2009, 04:57 PM   #65
bgoodsoil
Dare to be Stupid
 
bgoodsoil's Avatar
 
Joined: Jul 2008
Location: Atlanta, GA, USA
Oddometer: 3,998
Remove your rear wheel and look at your brake shoes from the left side of the bike. You'll see one half has an end in the middle and another has an end on the outside and both rest on the cam. With the lever on the bottom like normal, when you apply the brake the cam spins clockwise pushing the shoes into the drum. Notice that the cam isn't symmetrical--one part is flat, the part facing the shoes, the other part is rounded. When you flip the brake lever it will spin counterclockwise. Without modifying the cam the rounded parts would be touching the shoes and would slip--it wouldn't press the shoes into the drum. in other words:

Quote:
the rear brake [won't] work for shit
So, you need to do two things:

1: modify the cam. Make the rounded sections look like mirror images of the flattened sections. The cam has 2 oil sealing o-rings on it. You'll need to drain the FD before pulling the cam. You may want to replace those o-rings while you're at it. Nathan said there's nothing at the hardware store to match them exactly(he's checked). You have to use the BMW part.

2: flip your shoes. They pivot on a pin up forward and are held in by an e-clip. pull the e-clip, remove the springs, flip the shoes and transfer the springs to the other side so that they'll be on the outside.

I haven't flipped mine yet but Nathan told me how to do it and showed me one that he had already done it to. I pulled mine apart hoping to be lazy and get him to do the grinding for me but the shop was too busy. I've got the luxury of having a whole box of these cams in Nathan's attic 5 miles from my front door if I screw up, but it seems pretty straightforward.

Normally I do any grinding with a dremel but the face of the cam needs to be really straight and the dremel isn't always the best at that. I'm going to use a file(I know, I hate not using power tools) or maybe a belt sander with some 40 grit. The Ziz wheel might not be a bad option either, the cam's only about an inch across. You're removing metal from it and it's obviously under stress, don't remove more than you have too. I don't need to tell you all this. From what you've done to your bike, it's obvious you can work with your hands.

I've got 3 midterms next week, an aunt and a dad in surgery, gobs of statistics homework and another freakin' spanish essay. If you want to wait, as soon as I get through all that I'll go through the process and post up pics on my thread.

I may not get around to it for a few weeks though. After all these tests I've got spring break and hopefully I'll be riding this thing every day instead of pulling it apart everyday.

Good luck!

edit: I guess I should put some kinda 'lawyerly stuff' here saying that 'grinding on your brakes and screwing up could cause them to fail and you to die, so don't sue me since you're warned. well, go ahead and sue! can't get blood from a stone.
__________________
'85 BMW r80G/S--Another G/S on the road--Central America on a Shoestring--Nova Scotia on a Shoestring--Never Leave a Man's Behind

Proud SmugMug User Support ADV: Don't give those cheap bums your discount code

bgoodsoil screwed with this post 02-26-2009 at 06:09 PM
bgoodsoil is offline   Reply With Quote
Old 03-02-2009, 06:37 PM   #66
Airhead Wrangler OP
Adios Mexico
 
Airhead Wrangler's Avatar
 
Joined: Mar 2008
Location: Back in Seattle, FINALLY
Oddometer: 6,202
Finally. Xmas in March! My parts are here and I'm going to tear it all apart tomorrow night (and hopefully get it most of the way back together). Major mods are imminent. To use a Puttsism, I would consider myself "pissing my pants excited" right now.

__________________
R80ST Gets The HPN Treatment
Seattle to TDF on an airhead

Current rides: HPN #834, '93 R100GSPD "red rocket", '73 R75/5 Toaster mongrel, '80 Ducati Pantah 500SL, '92 DR350, '67 Honda SS50, '80 Honda Chaly.
Airhead Wrangler is online now   Reply With Quote
Old 03-02-2009, 06:42 PM   #67
Infracaninophile
Finding My Way..
 
Infracaninophile's Avatar
 
Joined: Sep 2001
Location: New England, USA
Oddometer: 7,510
Airhead:

What is the shiny metal welded item in the middle of your pic? Is that a new exhaust or something?

T.
Infracaninophile is offline   Reply With Quote
Old 03-02-2009, 06:52 PM   #68
bgoodsoil
Dare to be Stupid
 
bgoodsoil's Avatar
 
Joined: Jul 2008
Location: Atlanta, GA, USA
Oddometer: 3,998
is somebody getting twin discs!?

hate ta tell ya but fender braces are fashion accessories. They really don't do anything.
__________________
'85 BMW r80G/S--Another G/S on the road--Central America on a Shoestring--Nova Scotia on a Shoestring--Never Leave a Man's Behind

Proud SmugMug User Support ADV: Don't give those cheap bums your discount code
bgoodsoil is offline   Reply With Quote
Old 03-02-2009, 06:56 PM   #69
StephenB
G(/)S ... what else!
 
StephenB's Avatar
 
Joined: Aug 2005
Location: Ontario
Oddometer: 2,046
Quote:
Originally Posted by bgoodsoil
1: modify the cam. Make the rounded sections look like mirror images of the flattened sections.
Like so:

__________________

Some of the above is fact, some is fiction, some is my personal imagination and some is just simple truth. [me]

... i'm not touring around the world, but neither are most of the guys i see running overloaded spam cans ... [bmwblake]

Stephen Bottcher
Ontario, Canada

'72 R75/5 The Blues

www.stephenbottcher.net
StephenB is offline   Reply With Quote
Old 03-02-2009, 11:21 PM   #70
Airhead Wrangler OP
Adios Mexico
 
Airhead Wrangler's Avatar
 
Joined: Mar 2008
Location: Back in Seattle, FINALLY
Oddometer: 6,202
Quote:
Originally Posted by bgoodsoil
is somebody getting twin discs!?

hate ta tell ya but fender braces are fashion accessories. They really don't do anything.
Nope. Just one disc... for a GS front end that's going on tomorrow night.

As for the fender brace, I'm hoping it'll do SOMETHING. This big ass acerbis fender (sail?) I put on has a tendency to dance a bit above 60mph. Nothing wild, but on straight boring sections I can definitely feel it in the bars and it's a little bit annoying. Luckily it's not constant, but instead requires a bit of sidewind. I'm hoping this thing will stiffen it up at least a little.

Quote:
Originally Posted by Infracaninophile
What is the shiny metal welded item in the middle of your pic? Is that a new exhaust or something?
That's a Zach Y-pipe to replace the collector on my friend's GSPDC. Wish it was mine.


StephenB, thanks for the visual there. I haven't put eyes on my brake shoes in awhile and couldn't recall what that cam looked like from memory. That could be kind of tough to file that thing accurately enough to get even push on both sides of the brake lining. It also doesn't look possible to grind that cam in a way that would maintain the same amount of brake travel when rotating in the other direction without adding material to parts of it.
__________________
R80ST Gets The HPN Treatment
Seattle to TDF on an airhead

Current rides: HPN #834, '93 R100GSPD "red rocket", '73 R75/5 Toaster mongrel, '80 Ducati Pantah 500SL, '92 DR350, '67 Honda SS50, '80 Honda Chaly.
Airhead Wrangler is online now   Reply With Quote
Old 03-03-2009, 05:22 AM   #71
StephenB
G(/)S ... what else!
 
StephenB's Avatar
 
Joined: Aug 2005
Location: Ontario
Oddometer: 2,046
Quote:
Originally Posted by Airhead Wrangler
That could be kind of tough to file that thing accurately enough to get even push on both sides of the brake lining. It also doesn't look possible to grind that cam in a way that would maintain the same amount of brake travel when rotating in the other direction without adding material to parts of it.
You can't see it well but the two lobes or whatever you would call it are now symmetrical by removing material. I thought at first they were looking a bit flimsy after the grind but they work fine. The material is tough enough.
__________________

Some of the above is fact, some is fiction, some is my personal imagination and some is just simple truth. [me]

... i'm not touring around the world, but neither are most of the guys i see running overloaded spam cans ... [bmwblake]

Stephen Bottcher
Ontario, Canada

'72 R75/5 The Blues

www.stephenbottcher.net
StephenB is offline   Reply With Quote
Old 03-12-2009, 03:36 PM   #72
Airhead Wrangler OP
Adios Mexico
 
Airhead Wrangler's Avatar
 
Joined: Mar 2008
Location: Back in Seattle, FINALLY
Oddometer: 6,202
Well, the front end is on, but waiting for a brake hose from galfer which should be here on monday. In the meantime I'd like to install a racetech cartridge emulator which just arrived from 'Soy Anarchisto' today. (Thanks man!) Anyway, after reading both Anton's description and the one on gunsmoke, I'm questioning which route to pursue here. By installing it in the right leg you are adding more compression damping - adding it to the right leg where it didn't exist previously and leaving the stock compression damping in the left leg. This doesn't seem like it will reduce the harshness of fast bumps as the cartridge is meant to do as you're leaving your stock compression damping (the problem) alone and adding more compression damping to it (making it more harsh). It seems to me that the cartridge is designed to entirely replace the stock compression damping, so it would make the most sense to disable the stock compression damping in the left leg and install the racetech emulator in this leg to replace the stock compression damping entirely. Yet it seems that everyone who installs one of these installs it in the right leg. Anyone want to clear it up for me?

As for the rest of the mods, they've gone pretty well. Just a little minor tweaking necessary. I'm hoping to have this sucker on the road next week. Yes, I know I owe some photos. They're coming sometime soon.
__________________
R80ST Gets The HPN Treatment
Seattle to TDF on an airhead

Current rides: HPN #834, '93 R100GSPD "red rocket", '73 R75/5 Toaster mongrel, '80 Ducati Pantah 500SL, '92 DR350, '67 Honda SS50, '80 Honda Chaly.
Airhead Wrangler is online now   Reply With Quote
Old 03-12-2009, 03:48 PM   #73
England-Kev
Beastly Adventurer
 
Joined: Feb 2007
Location: Berkshire, England. Just off the Beaten Track!
Oddometer: 3,219
Quote:
Originally Posted by Airhead Wrangler
Yes, I know I owe some photos. They're coming sometime soon.
Well come on then!




England-Kev is offline   Reply With Quote
Old 03-12-2009, 04:06 PM   #74
SOLO LOBO
airhead or nothing
 
SOLO LOBO's Avatar
 
Joined: Mar 2004
Location: Shoreline, WA
Oddometer: 8,336
Quote:
Originally Posted by Airhead Wrangler
This doesn't seem like it will reduce the harshness of fast bumps as the cartridge is meant to do as you're leaving your stock compression damping (the problem) alone and adding more compression damping to it (making it more harsh)..
I think the point is to make the compression damping more tunable... if you add a GV, you would also move both fork legs to different oil.

If your compression damping is too harsh with only one leg doing the damping work, it would seem that a change of oil and perhaps spring or spring pre-load is also necessary.

In re-reading Scot's page it does seem like he is switching beteen right and left as to where the function really lies, and Anton is very clear about this...read his first and third paragraphs.

All I can say is that the GV made a big difference in the front end of my old R100GS!

Anton does not that you should remove the disc from the rebound valve to allow the compression damping in the right fork leg to work best...
__________________
"punkrocks what it's all about" - J. Strummer



Quote:
Originally Posted by Stagehand
your bike is suitably dirty. Well done.
SOLO LOBO is offline   Reply With Quote
Old 03-12-2009, 04:27 PM   #75
soyanarchisto
Beastly Adventurer
 
soyanarchisto's Avatar
 
Joined: Sep 2005
Location: Sunny PDX
Oddometer: 2,937
Which leg did you put your emulator in Solo?

WRT the fender brace--I am getting ready to put one on my GS as well. Seems to me that it should add some more support if I want to mount a fender bag on there for a spare tube, no?
soyanarchisto is offline   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 07:27 PM.


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