Go Back   Horizons Unlimited - The HUBB > Technical, Bike forums > BMW Tech

BMW Tech BMW Tech Forum - For Questions specific and of interest to BMW riders only. Questions comparing which bike is best etc go in the "Which Bike" forum.
Contact Overland Solutions for all your custom modifications and setup for overland travel.

7 Litre Camel Tank Lets You Explore More, Click to Find out More!

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 25 Jul 2003
Registered Users
New on the HUBB
 
Join Date: Jul 2003
Location: BATHURST, NSW, AUSTRALIA
Posts: 1
Downsizing?

After 2 R75s and 2 R80s I find the 1000 (95 model) is very rough. That low-down torque is usable, but it's not pleasant.
What would it take to drop the size back to 800?
One complication seems to be that whereas US-market bikes had the same 32mm Bings, the European & Aus 1000s had 40mm carbs.
Shold I even contemplate this?
Reply With Quote
  #2  
Old 25 Jul 2003
Grant Johnson's Avatar
HU Founder
Veteran HUBBer
 
Join Date: Dec 1997
Location: Vancouver BC Canada
Posts: 4,561
You need everything from the crankcase out - that's carbs, heads, barrels and pistons. Rocker assemblies are identical on same year bikes. Pipes should be the same that year.

You SHOULD be able to find someone gagging to go the other way, and make a profit on the deal!

I recently did that myself - converted my 86 R80G/S to a 1000. Very straightforward - just replace it all!

A possible cure for the roughness is to use lighter pistons available from Touratech. The only real reason for the difference in smoothness is the greater weight of the 1000cc pistons. If you could get the pistons down to the weight of the 800 pistons you'd have the same balance, and it would feel just like a strong 800.

The best but most expensive way is to get the lighter pistons and also rebalance it. That means taking out the crank.

------------------
Grant Johnson

Seek, and ye shall find.

------------------------

One world, Two wheels.
www.HorizonsUnlimited.com
__________________
Grant Johnson

Seek, and ye shall find.

------------------------

Inspiring, Informing and Connecting travellers since 1997!
www.HorizonsUnlimited.com
Reply With Quote
  #3  
Old 25 Jul 2003
Moderator
Veteran HUBBer
 
Join Date: Mar 2001
Location: British Columbia
Posts: 239
I'm thinking of going the way Grant did. I have a low milage 800cc setup currently. Let me know if you are serious about the swap.

I had an 88' R100GS last so I know what you mean about rough running. the 800 is much smoother. On the other hand, I miss the power of the larger cylinders. If I were to do it all again, I'd probably spend the time and money trying to smooth out the 1000. It's a tough call. I find the 800 fine for everything except hard excelleration for passing with a load and passenger. Can't beat the tractability of the 800 for slower running or more relaxed hwy cruising tho'.
Reply With Quote
  #4  
Old 25 Sep 2008
Registered Users
Veteran HUBBer
 
Join Date: Oct 2002
Location: Stockholm - Sweden
Posts: 316
How did it go ?
What did you chose to do ?

My reply - YES!
I have now run Siebenrock 1000cc dual-plugged for about two years. TOO much power at winter! I sort of regrett the up-grading, but faced with the cost of renewing heads, pistons and barrels I opted for 1000cc due to the shear cost of redoing my 800cc high compression conversion.

My recommendation on the 800cc system depends on what your demands are (where and how to drive).
__________________
Drive Safely,
Albert
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 Registered Users and/or Members and 1 guests)
 
Thread Tools
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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On


 
 


HU DVD Summer Special!

Now that summer is here, get On the Road! Take 30% off the Achievable Dream - On the Road! 2-DVD set until August 31 only. Get On the Road! Learn the tips to staying healthy, happy and secure on your motorcycle adventure!

Our veteran travellers share their tips (and great stories) for staying healthy, happy and secure on your motorcycle adventure.

"A fantastic, informative and inspirational DVD."

"It's brilliant - thank you very much!"

Check it out at the HU Store! Remember to use Coupon Code 'ONTHEROAD' on your order when you checkout.


Renedian Adventures


Renedian Adventures

What others say about HU...

"I just wanted to say thanks for doing this and sharing so much with the rest of us." Dave, USA

"Your website is a mecca of valuable information and the DVD series is informative, entertaining, and inspiring! The new look of the website is very impressive, updated and catchy. Thank you so very much!" Jennifer, Canada

"...Great site. Keep up the good work." Murray and Carmen, Australia

"We just finished a 7 month 22,000+ mile scouting trip from Alaska to the bottom of Chile and I can't tell you how many times we referred to your site for help. From how to adjust your valves, to where to stay in the back country of Peru. Horizons Unlimited was a key player in our success. Motorcycle enthusiasts from around the world are in debt to your services." Alaska Riders

contest pic

10th Annual HU Travellers Photo Contest is on now! This is an opportunity for YOU to show us your best photos and win prizes!

NEW! HU 2014 Adventure Travel T-shirts! are now available in several colors! Be the first kid on your block to have them! New lower prices on synths!

HU 2014 T-shirts now in!

Check out the new Gildan Performance cotton-feel t-shirt - 100% poly, feels like soft cotton!


What turns you on to motorcycle travel?


Global Rescue, WORLDwide evacuation services for EVERYONE

Global Rescue is the premier provider of medical, security and evacuation services worldwide and is the only company that will come to you, wherever you are, and evacuate you to your home hospital of choice. Additionally, Global Rescue places no restrictions on country of citizenship - all nationalities are eligible to sign-up!


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 R80 G/S motorcycle.

Susan and Grant Johnson 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 (22 this year!); 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, the HUBB or to receive the e-zine. 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.


Books & DVDs

amazon

All the best travel books and videos listed and often reviewed on HU's famous Books page. Check it out and get great travel books from all over the world.


Motorcycle Express for shipping and insurance!

Motorcycle Express

MC Air Shipping, (uncrated) USA / Canada / Europe and other areas. Be sure to say "Horizons Unlimited" to get your $25 discount on Shipping!
Insurance - see: For foreigners traveling in US and Canada and for Americans and Canadians traveling in other countries, then mail it to MC Express and get your HU $15 discount!




All times are GMT +1. The time now is 20:03.