Go Back   Horizons Unlimited - The HUBB > Technical, Bike forums > Yamaha Tech
Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
Photo by Hendi Kaf, in Cambodia

I haven't been everywhere...
but it's on my list!


Photo by Hendi Kaf,
in Cambodia



Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 20 Feb 2012
Registered Users
Veteran HUBBer
 
Join Date: Feb 2012
Location: Milan, Italy
Posts: 613
xt600 supermoto

Hello Xt'rs

new here,

i am based in milan, italy and road race vintage stuff like CB500/4 and a 750/810 Gpz in the national series.

in order to get more (and cheaper) track time, bought a nice condition 1990 XT600E with 25K km that i am in the process of turning into a supermoto.
It is not meant to be a racer, just something to train with in a track i have near home (Castelleto di Branduzzo)

Pista

Not going to mess with the motor much, it's sweet running, so just a foam air filter and straight through exhaust.

TZR 17" with a 300mm disc wheels are on the way, gonna fit a GSXR caliper for braking in the front.

A few questions then:

15/45 is the stock gearing, I will surely want to shorten as this is a supermoto track only bike. does anybody have any experience with supermoto track gearing for an XT? Bike will not be used for any street riding, just SM track and a slow one at that.

suspension set up. I will lower and stiffen the front springs, any numbers as to a baseline ride height and spring rate? any ideas for a reasonable shock change that doesnt include a 1000$ ohlins?

any recommendations regarding jetting changes for a foam filter and open race exhaust? The bike has the usual stock double carb jobbie.

Will post pics when the bike starts take shape. right now its a plain XT600E....

Grazie mille in advance

TG
Reply With Quote
  #2  
Old 20 Feb 2012
Registered Users
Veteran HUBBer
 
Join Date: Dec 2008
Location: Denmark
Posts: 1,417
The carb runs rich stock, so if you need any jetting go up one number in idlejet, and I bet you're pretty close, if you only use it for track, a k&n should breathe better, or atleast thats my guess?

As for gearing, it depends on the track. Try with stock gearing, and take it from there. Its easy and cheap to add a 14 tooth frontsprocket, to try that out aswell.

Wilbers and hagon have shocks at around 4-500euro that seems good. A friend of mine has a wilbers on his xtz660, it was tons better than the old worn out shock =)

Last edited by Jens Eskildsen; 22 Oct 2012 at 23:12.
Reply With Quote
  #3  
Old 21 Feb 2012
Registered Users
Veteran HUBBer
 
Join Date: Feb 2012
Location: Milan, Italy
Posts: 613
thanks jens

track is 90% slow, like mostly 2nd gear turns save for a staight with up to 140km/h in a supermoto. in th ebottom of the link i posted there's a nice telemetry video

14 front is surely a start but as i have to put a new chain, would hate finding out later that i cut it too short for bigger rear sprockets...

will check into those shocks but been looking today and the stock one looks rebuidable. might give it a try

tnxs

TG
Reply With Quote
  #4  
Old 21 Feb 2012
Registered Users
Veteran HUBBer
 
Join Date: Dec 2008
Location: Denmark
Posts: 1,417
As far as I recall, you can go 14-47 on stock chain. So a 14 for a starters might not be so bad afterall.

I dont think you will need it much lower, otherwise I think you will hurt youre topend too much.

Try messing around at www.gearingcommander.com You can see which sprockets gives you what speed, at different rpm's its good stuff.

Cant wait for the pictures
Reply With Quote
  #5  
Old 21 Feb 2012
Registered Users
Veteran HUBBer
 
Join Date: Feb 2012
Location: Milan, Italy
Posts: 613
yep, i know gearingcommander, it's really nice, the data on the GPZ750 was entered by me

but i just discovered that kedo have an even more useful gearing calculator that lets you know also axle displacement according to sprockets and how many links you run in the chain!

just what i needed!

KEDO Ketten-Rechner
Reply With Quote
  #6  
Old 26 Feb 2012
Registered Users
New on the HUBB
 
Join Date: Jun 2007
Location: California
Posts: 7
If you have access to an older kick-start XT600 / TT600 / XT550 /SRX-6 engine, consider swapping in the primary drive and clutch basket. The gearing is shorter in the older bikes. The lower primary gearing not only lowers the overall gearing, but results in better acceleration.

Offset from the triples isn't correct for 17" front wheel. Bike will be twitchy with stock forks. If you can swap triples or forks for something that less offset/ more trail, the bike will work better. I went to an entire front end from a MZ Mastiff for mine. If you can get more trail in the front, a longer shock will be better for the rear. On mine, I have an earlier, longer XT600 shock that has been revalved and a stiffer spring.

Good luck!
Reply With Quote
  #7  
Old 26 Feb 2012
Registered Users
Veteran HUBBer
 
Join Date: Feb 2012
Location: Milan, Italy
Posts: 613
thanks for the useful info joe

wheels arrived and its easy to see how much steeper the rake is now, so sure, trail is going to be shorter too. know this from my road racing too, get too steep at the front and you loose feedback at the bars and bike gets nervous.

think i am going to hit the track first and then see how bad it is.

keeping this project kind of low key, so cant see myself getting too deep into motor things, or swapping front ends, too many other projects on the table!

that said, for all i know, it doesnt matter where you lower gearing, primary gear or final drive, at the end of the day its all about motor revs vs rear wheel drive revs. the TZR 17" wheels i got already came fitted with a 45 sprocket, so for now will only change the front sprocket for 14, hit the track some and then see.

cheers & grazie

TG
Reply With Quote
  #8  
Old 21 Mar 2012
Registered Users
Veteran HUBBer
 
Join Date: Feb 2012
Location: Milan, Italy
Posts: 613
almost ready to rock

not much missing, need to sort the 17mm axle in the front (stock is 15), paint rear fender and tank white and maybe do some side panels to tidy things up.

should hit the track in a matter of weeks i guess...

BTW, weighted the thing and it's around 145 kg. dont how much the stock bike weighted but it surely feels lighter just pushing it around
Attached Thumbnails
xt600 supermoto-01.jpg  

xt600 supermoto-02.jpg  


Last edited by turboguzzi; 9 Jul 2014 at 11:28.
Reply With Quote
  #9  
Old 22 Mar 2012
Registered Users
New on the HUBB
 
Join Date: Nov 2011
Location: Washington, USA
Posts: 6
Thumbs up

Sweet looking bike! I really dig the new wheels. What did they come off of? And what did you do for the chain alignment and getting the proper sized rotor? I too am looking to get a spare set of cast wheels and fit them to the XT and try some racing at a go kart track here in the states
Reply With Quote
  #10  
Old 26 Mar 2012
Registered Users
Veteran HUBBer
 
Join Date: Feb 2012
Location: Milan, Italy
Posts: 613
Quote:
Originally Posted by Phoenix6 View Post
Sweet looking bike! I really dig the new wheels. What did they come off of? And what did you do for the chain alignment and getting the proper sized rotor? I too am looking to get a spare set of cast wheels and fit them to the XT and try some racing at a go kart track here in the states
the guy who sold them to me told they where off a Yamaha TZR 250 or 125, a small race replica bike sold in europe and Japan. Front offset is not a big problem as its easy to make spacers for the wheel and then caliper.

Back end is more difficult as after you center the wheel, you still need the right offset between tire and sprocket, guess i was just lucky with mine but if i need to tweak, i might need to put the sprocket carrier a bit further away form the hub

will post some pics to explain the mods
Reply With Quote
  #11  
Old 26 Mar 2012
Registered Users
New on the HUBB
 
Join Date: Nov 2011
Location: Copenhagen
Posts: 10
I would have guessed Suzuki GS500E/F wheels based on the looks of it, as the TZR250 have twin discs up front, and the 125cc model have the disc on the right side of the wheel.
It should be cast into the wheels though.

Love the look of the bike, I'm well tempted to try and make up a set of 17" wheels for my XT.
Reply With Quote
  #12  
Old 26 Mar 2012
Registered Users
Veteran HUBBer
 
Join Date: Dec 2008
Location: Denmark
Posts: 1,417
Quote:
Originally Posted by turboguzzi View Post
BTW, weighted the thing and it's around 145 kg. dont how much the stock bike weighted but it surely feels lighter just pushing it around

Im pretty sure its 156/168 dry/wet. Mine is 180 wet with 23ltr of gas, handguards, bashplate ect.
Reply With Quote
  #13  
Old 26 Mar 2012
Registered Users
Veteran HUBBer
 
Join Date: Feb 2012
Location: Milan, Italy
Posts: 613
Quote:
Originally Posted by Jimmie View Post
I would have guessed Suzuki GS500E/F wheels based on the looks of it, as the TZR250 have twin discs up front, and the 125cc model have the disc on the right side of the wheel.
It should be cast into the wheels though.

Love the look of the bike, I'm well tempted to try and make up a set of 17" wheels for my XT.
Thanks and well, just checked, turns out both wheels are branded "yamaha/Brembo" in the same casting. guess that makes them TZR125 wheels as that bike was made in Yamaha Belgrada near Monza back at the time.

front disc might have been on the right on the TZR but the XT brake brackets are on the left , need to check tire rotation direction now that i think of it
Reply With Quote
  #14  
Old 27 Mar 2012
Registered Users
New on the HUBB
 
Join Date: Nov 2011
Location: Copenhagen
Posts: 10
Quote:
Originally Posted by turboguzzi View Post
Thanks and well, just checked, turns out both wheels are branded "yamaha/Brembo" in the same casting. guess that makes them TZR125 wheels as that bike was made in Yamaha Belgrada near Monza back at the time.

front disc might have been on the right on the TZR but the XT brake brackets are on the left , need to check tire rotation direction now that i think of it
I didn't notice that the front wheel is mounted opposite to the back wheel until you mentioned it. Next time I'll take a closer look before commenting.
Reply With Quote
  #15  
Old 26 Apr 2012
Registered Users
Veteran HUBBer
 
Join Date: Feb 2012
Location: Milan, Italy
Posts: 613
shit happens

well, was almost ready to hit the track, had even registered to a Supermoto day, then on the weekend before the first ride broke my ankle in a road accident with my VFR.....

:P

oops, project/ride on hold i guess.

sucks a bit
Reply With Quote
Reply


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

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
1984 xt600 kicks back--HELP!!! Spyder1427 Yamaha Tech 27 9 Feb 2016 02:27
Fitment of Tenere panels on a plain XT600? Pawlie Yamaha Tech 7 12 Jan 2012 18:56
XT600 engine for sale (UK) Tenere Tom Yamaha Tech 2 13 Nov 2011 21:12
supermoto rims for 93' xt6 Pboko2388 Yamaha Tech 3 1 Nov 2011 17:44

 
 

Announcements

Thinking about traveling? Not sure about the whole thing? Watch the HU Achievable Dream Video Trailers and then get ALL the information you need to get inspired and learn how to travel anywhere in the world!

Have YOU ever wondered who has ridden around the world? We did too - and now here's the list of Circumnavigators!
Check it out now
, and add your information if we didn't find you.

Next HU Eventscalendar

25 years of HU Events
Be sure to join us for this huge milestone!

ALL Dates subject to change.

2025 Confirmed Events:

Virginia: April 24-27 2025
Queensland is back! May 2-4 2025
Germany Summer: May 29-June 1 2025
CanWest: July 10-13 2025
Switzerland: Date TBC
Ecuador: Date TBC
Romania: Date TBC
Austria: Sept. 11-14
California: September 18-21
France: September 19-21 2025
Germany Autumn: Oct 30-Nov 2 2025

Add yourself to the Updates List for each event!

Questions about an event? Ask here

See all event details

 
World's most listened to Adventure Motorbike Show!
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...

Adventurous Bikers – We've got all your Hygiene & Protection needs SORTED! Powdered Hair & Body Wash, Moisturising Cream Insect Repellent, and Moisturising Cream Sunscreen SPF50. ESSENTIAL | CONVENIENT | FUNCTIONAL.

2020 Edition of Chris Scott's Adventure Motorcycling Handbook.

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.

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!



Five books by Graham Field!

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.

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 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.




All times are GMT +1. The time now is 06:04.