|
|
30 Sep 2012
|
|
Contributing Member
Veteran HUBBer
|
|
Join Date: Jan 2004
Location: Munich, the beer capital
Posts: 1,060
|
|
The gearbox of my R80GS had to be rebuilt at 18,000 kms. Once open I decided to have the shorter 1st and longer 5th fitted, and exchanged the clutch for the ceramic type. Regarding fuel consumption it didn't make any difference, but I love the lower 1st. It allows you to approach tricky road conditions fairly slow.
Meanwhile the bike has done 150,000 kms and is still going very well. IMHO the best of the above changes is the ceramic clutch. Probably it will outlive the bike
Hans
__________________
Only when we pause to wonder
do we go beyond the limits of our little lives.
(Rod McKuen)
|
1 Oct 2012
|
|
Gold Member
Veteran HUBBer
|
|
Join Date: Feb 2011
Location: Chiang Mai, Thailand
Posts: 193
|
|
Improved fuel economy with taller 5th gear
Maybe.
It's really a matter of the engine's torque curve and at what MPH the flat part of that curve will be achieved. Typically, engines provide optimum mileage in a range of the curve which appears rather flat, like a stylized mesa.
As for it's utility in the 'Stans . . . well, that will be interesting. Not alot of roads like that, there.
With so much else to watch for . . . roaming livestock (horses, yaks, bactrian camels, goats, etc), road conditions, the ever vigiliant revenue generation officals (aka 'police'), scenic views and signage in cyrillic . . . at least in UZ, it's a lot more critical to SEE a fuel station WITH fuel than optimize on your current usage !
__________________
Orange, it's the new black.
|
1 Oct 2012
|
Registered Users
HUBB regular
|
|
Join Date: Jun 2012
Location: Colchester, Essex
Posts: 81
|
|
Higher 5th gear for airhead gearbox
Hi,
I fitted a 5th gear to my R100GS PD output shaft back in December 2007 that gave a 6% higher ratio. Since then the bike has done 100,000 miles (340,000 miles in all) and it continues to function well. It is a simple and straightforward swap once you have dismantled the gearbox.
The gear (part number: 23221242992z) was supplied by S Meyer BMW; S.Meyer GmbH (limited company) - BMW motorcycle spare parts - Homepage
Meyer's in those days also listed a pair of gears, one for the lay-cluster and one for the output shaft that would give a 10% higher ratio. I fitted the 6% one because at the time they only had that in stock and I couldnt wait.
Airhead gearboxes are quite easy to work on, but it is important to remember to get the endfloat on the three shafts shimmed correctly, so as to ensure longevity. Also bear in mind it is worth checking to see if the outputshaft bearing at the clutch end has provision for a circlip to retain the bearing (BMW went through a phase of manufacturing some shafts without a circlip groove, which can cause premature bearing wear). If it dosen't then (as was the case with my shaft) you should make provision for a circlip on the shaft.
Regards to all
Guy
|
2 Oct 2012
|
|
Contributing Member
Veteran HUBBer
|
|
Join Date: Jan 2004
Location: Munich, the beer capital
Posts: 1,060
|
|
Quote:
Originally Posted by plainshorse
....
Also bear in mind it is worth checking to see if the outputshaft bearing at the clutch end has provision for a circlip to retain the bearing (BMW went through a phase of manufacturing some shafts without a circlip groove, which can cause premature bearing wear). If it dosen't then (as was the case with my shaft) you should make provision for a circlip on the shaft.
Regards to all
Guy
|
Yep, that was the reason for my gearbox repairs after only 18 kkms The '93 models had no circlip fitted.
Since then I have done over 120 kkms without any problems.
__________________
Only when we pause to wonder
do we go beyond the limits of our little lives.
(Rod McKuen)
|
21 Jan 2016
|
Registered Users
HUBB regular
|
|
Join Date: Nov 2007
Location: Ireland
Posts: 80
|
|
High 5th Gear
Did you ever fit the tall 5th Mark? If so how did it fare, did the 800 manage to pull it?
|
22 Jan 2016
|
|
Contributing Member
Veteran HUBBer
|
|
Join Date: Jan 2004
Location: Munich, the beer capital
Posts: 1,060
|
|
"tall" is somewhat exaggerated The revvs drop by about 500 rpm which saves a bit of fuel. Power-wise no probs, but when about to overtake fast moving traffic I have to change to 4th gear ;o)
Now the R80 isn't exactly a racing machine, but with the shorter 1st and longer 5th I'm happy. When the pistons are worn down I'll fit 1040cc, which I found a couple of months ago. Then it might make sense to fit the rear drive of the R100without changing the gearbox.
__________________
Only when we pause to wonder
do we go beyond the limits of our little lives.
(Rod McKuen)
|
22 Jan 2016
|
Registered Users
Veteran HUBBer
|
|
Join Date: Feb 2002
Location: Wessex, UK
Posts: 2,136
|
|
Quote:
Originally Posted by BMurr
Did you ever fit the tall 5th Mark? If so how did it fare, did the 800 manage to pull it?
|
Not yet, I thought at 100,000 miles my gearbox would need an overhaul but it was fine, I thought the same at 150,000 when I asked this question, it has now done 170,000 and still seems fine so as it isn't broken I won't fix it.
As for the higher gear my monolever G/S has higher gearing at the bevelbox which it pulls no problem so I am expecting the paralever GS to do the same even if it is a little heavier.
|
Currently Active Users Viewing This Thread: 1 (0 Registered Users and/or Members and 1 guests)
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
Check the RAW segments; Grant, your HU host is on every month!
Episodes below to listen to while you, err, pretend to do something or other...
2020 Edition of Chris Scott's Adventure Motorcycling Handbook.
"Ultimate global guide for red-blooded bikers planning overseas exploration. Covers choice & preparation of best bike, shipping overseas, baggage design, riding techniques, travel health, visas, documentation, safety and useful addresses." Recommended. (Grant)
Ripcord Rescue Travel Insurance™ combines into a single integrated program the best evacuation and rescue with the premier travel insurance coverages designed for adventurers.
Led by special operations veterans, Stanford Medicine affiliated physicians, paramedics and other travel experts, Ripcord is perfect for adventure seekers, climbers, skiers, sports enthusiasts, hunters, international travelers, humanitarian efforts, expeditions and more.
Ripcord travel protection is now available for ALL nationalities, and travel is covered on motorcycles of all sizes!
What others say about HU...
"This site is the BIBLE for international bike travelers." Greg, Australia
"Thank you! The web site, The travels, The insight, The inspiration, Everything, just thanks." Colin, UK
"My friend and I are planning a trip from Singapore to England... We found (the HU) site invaluable as an aid to planning and have based a lot of our purchases (bikes, riding gear, etc.) on what we have learned from this site." Phil, Australia
"I for one always had an adventurous spirit, but you and Susan lit the fire for my trip and I'll be forever grateful for what you two do to inspire others to just do it." Brent, USA
"Your website is a mecca of valuable information and the (video) series is informative, entertaining, and inspiring!" Jennifer, Canada
"Your worldwide organisation and events are the Go To places to for all serious touring and aspiring touring bikers." Trevor, South Africa
"This is the answer to all my questions." Haydn, Australia
"Keep going the excellent work you are doing for Horizons Unlimited - I love it!" Thomas, Germany
Lots more comments here!
Diaries of a compulsive traveller
by Graham Field
Book, eBook, Audiobook
"A compelling, honest, inspiring and entertaining writing style with a built-in feel-good factor" Get them NOW from the authors' website and Amazon.com, Amazon.ca, Amazon.co.uk.
Back Road Map Books and Backroad GPS Maps for all of Canada - a must have!
New to Horizons Unlimited?
New to motorcycle travelling? New to the HU site? Confused? Too many options? It's really very simple - just 4 easy steps!
Horizons Unlimited was founded in 1997 by Grant and Susan Johnson following their journey around the world on a BMW R80G/S.
Read more about Grant & Susan's story
Membership - help keep us going!
Horizons Unlimited is not a big multi-national company, just two people who love motorcycle travel and have grown what started as a hobby in 1997 into a full time job (usually 8-10 hours per day and 7 days a week) and a labour of love. To keep it going and a roof over our heads, we run events all over the world with the help of volunteers; we sell inspirational and informative DVDs; we have a few selected advertisers; and we make a small amount from memberships.
You don't have to be a Member to come to an HU meeting, access the website, or ask questions on the HUBB. What you get for your membership contribution is our sincere gratitude, good karma and knowing that you're helping to keep the motorcycle travel dream alive. Contributing Members and Gold Members do get additional features on the HUBB. Here's a list of all the Member benefits on the HUBB.
|
|
|