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!

LinkBack Thread Tools Display Modes
Old 23 Jan 2002
Registered Users
Veteran HUBBer
Join Date: Jun 2000
Location: San Francisco, USA
Posts: 225
R80 1000cc concersion kit - worthwhile?

I've got my R80G/S apart and I'm getting ready to completely rebuild the top end.

I found a 1000cc kit for this bike that bumps the power to 67 HP and claims to reduce fuel consumption. It's offered by Eurotech, which is a very reputable dealer - anyone have any thoughts on this kit? The compresion ratio is raised to 9.5:1 - is this a little too high to stay reliable for 50-100,000 miles? Any idea what octane fuel will be suficient to keep it running healthily at that compression ratio?

Here's the kit:

Wright Bagwell
Reply With Quote
Old 23 Jan 2002
John Ferris's Avatar
Gold Member
Veteran HUBBer
Join Date: Feb 2001
Location: Reno,NV,USA
Posts: 563
I would go for 1000 cc clyinders from a late 1980s or 1990s R100 with heads from a R100-s,rs,rt 1978 to 1984 those have the 44mm intake valves. Then 40mm bings.
Stay with 8.5:1 pistons. 9.5:1 is too high for modern gas. You would eather have to get aviation gas or dual-plug the heads.
Reply With Quote
Old 8 Oct 2002
Registered Users
Veteran HUBBer
Join Date: Oct 2002
Location: Stockholm - Sweden
Posts: 316
What did you go for ?
I choose to stay with the 800cc since 1000cc will be too much torque at winter.
I have CC-highflowvalves (San José BMW is not populare with me however)and will have the heads shimmed down to raise compression ratio.
9.2:1 standard 800cc pistons (models 1978-1980)with pistonrings for nicasil barrels (you can have pistons made at Venolia instead - much better !) Will give me about 10.2-10.5:1 => recon that will give me about 60-65Bhp, and revs instead of torque.

Then when you fix the heads - ge the BMW car valves, 46mm and highflow intake valves and stay with the 38mm intake => is supposed to make a "hell-of-a-drifference". A guy has just broken in this converson in Sweden on his newly converted boxer. These valves are 5mm longer, so you have to have them "cut down" and a new grove on the valvestem. They will fit the standard 44mm intake seats nicely - with no more modifications (!).
You will have to take up the correct valvesize in the piston head though.

The 67 conversion kit, to which you can keep your 32mm carbs, is affordable in germany - but very expensive elsewere.

By the way - scrap the bings. Get Dell'ortos (I favour them)or Mikunis, CC-favours them (www.sjbmw.com). You will be surpriced how much better the bike runns with those carbs !

Albert Lindberg, D.C.

[This message has been edited by Grant Johnson (edited 08 October 2002).]
Drive Safely,
Reply With Quote
Old 15 Oct 2002
Veteran HUBBer
Join Date: Mar 2001
Location: British Columbia
Posts: 239
It really depends on what you are using the bike for. However, I did talk to one fellow who made this modification. He complained of very hard (to impossible) starting with the stock starter. When I talked with Eurotech, they recommend a different starter for use with this kit. Just something to keep in mind if you go this route.
Reply With Quote
Old 16 Oct 2002
Registered Users
Veteran HUBBer
Join Date: Jun 2000
Location: San Francisco, USA
Posts: 225
Hey folks,
Thanks for the responses. I should have noted that I ended up selling the R80 in favor of a shiny new R1150 GS after much debate and calculation of how much it would cost to get the R80 built up to what I wanted. I think I'm actually saving money

Wright Bagwell
Reply With Quote

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

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


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 16:33.