Go Back   Horizons Unlimited - The HUBB > Technical, Bike forums > Yamaha Tech
xtz 660 problem.... xtz 660 problem....
Register FAQ Calendar Today's Posts
Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
Photo by Andy Miller, UK, Taking a rest, Jokulsarlon, Iceland

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


Photo by Andy Miller, UK,
Taking a rest,
Jokulsarlon, Iceland



Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 29 Oct 2006
Registered Users
HUBB regular
  
Join Date: Oct 2006
Location: tenerife
Posts: 75
xtz 660 problem....
hello all....my friend and I both have identical xtz 660´s from the same year...his will get to almost 100 mph but mine will not go over 70mph...have checked and both sprockets,chains and exhausts are the same...any ideas..
he will not let me swap the carb before anyone suggests this......!
Reply With Quote
  #2  
Old 30 Oct 2006
Registered Users
Veteran HUBBer
  
Join Date: Apr 2003
Location: sydney australia
Posts: 174
Post help,
well bobby, thats a bit of a weird one... firstly your trusty old xtz should be able to get you a long way over 70mph. not that you need to be told that.

i would probably start with a compression test of your engine, that would be the first idea, then check carby differences, ie jetting, internal mods,check the spark output to the plug...and perhaps the plug itself.... if all this is the same as your friends i would be surprised...

and perhaps check to see if you are running similar rear tyres, if you have a lower profile tyre this may effect its top speed...

very broad reply i know but.... difficult to say, but im betting your motor is a little down on compression compared with your friend bike, do they use the same amount of oil on long rides ?...phil.
Reply With Quote
  #3  
Old 30 Oct 2006
smokinrider's Avatar
Registered Users
HUBB regular
  
Join Date: Oct 2006
Location: Hampshire UK
Posts: 63
you say they are identical.
are they the same year, are they both standard? are they both the same mileage? before you start pulling bits off lets establish the facts.
has he fiddled with his, you with yours? if so what. i presume you have done a service, set the valve clearences, new plug, cleaned the carbs and air filter, checked your brakes arnt binding.
if not then thats your starting point, youll need to have the carbs off anyway at some point to compare jets so when its off cleaning it, take note of jet nembers and sizes, to save time later. post them on here and no doubt someone will notice if they are seriously wrong.
your bike should be doing well over 70 so something is out somewhere. but often its a simple thing like blocked jet, fouled plug? dirty air filter.
if the motor runs and doesnt rattle and smoke then the chances are that there isnt anything major wrong with that.
Reply With Quote
  #4  
Old 30 Oct 2006
Contributing Member
Veteran HUBBer
  
Join Date: Oct 2002
Location: montana usa
Posts: 547
XTZ with the slows
Also check the exhaust to see if it has become plugged. Sometimes they rust up. If it has a diaphram type carb check that the diaphram is identical to your friends. It is quite easy to swap that one part. If He is your bud he would help you out wouldn't he?
Reply With Quote
  #5  
Old 3 Nov 2006
Registered Users
HUBB regular
  
Join Date: Oct 2006
Location: tenerife
Posts: 75
xtz
its not the exhaust..i have swapped the exhaust from his bike to mine...at standstill you can rev the bike to the redline easy....when on the road the revs go to the redline but the bike is doing 70 mph or less at that output...i have opened the carb and the diaphram in the second body is sound....am going to fit different carb soon from another bike and check...also should it run temporarily with no air filter as it does not want to run with the filter out...?
Reply With Quote
  #6  
Old 3 Nov 2006
Contributing Member
Veteran HUBBer
  
Join Date: Oct 2002
Location: montana usa
Posts: 547
Redlined XTZ
Did you say that your bike will redline the tach in high gear? Count the number of teeth on your front and rear sprockets and compare it to your friends. If the motor is redlined then to increase your road speed you have to change the gearing. Unless you have a faulty tach or speedo.
Reply With Quote
  #7  
Old 3 Nov 2006
Registered Users
Veteran HUBBer
  
Join Date: Apr 2002
Location: bizovac, croatia
Posts: 240
Quote:
Originally Posted by bobbyrandall
hello all....my friend and I both have identical xtz 660´s from the same year...his will get to almost 100 mph but mine will not go over 70mph...have checked and both sprockets,chains and exhausts are the same...any ideas..
he will not let me swap the carb before anyone suggests this......!
First of all, check second carb membrane...
__________________
AnteK
Reply With Quote
  #8  
Old 14 Nov 2006
onepotbaz's Avatar
Registered Users
New on the HUBB
  
Join Date: Nov 2006
Location: nottingham u.k.
Posts: 10
Quote:
Originally Posted by bobbyrandall
its not the exhaust..i have swapped the exhaust from his bike to mine...at standstill you can rev the bike to the redline easy....when on the road the revs go to the redline but the bike is doing 70 mph or less at that output...i have opened the carb and the diaphram in the second body is sound....am going to fit different carb soon from another bike and check...also should it run temporarily with no air filter as it does not want to run with the filter out...?
clutch .?.
__________________
i'm to old to kickstart a 600cc single .tho i'll give it a go if whiskey & fags are very close by .
Reply With Quote
  #9  
Old 14 Nov 2006
Livotlout's Avatar
Contributing Member
Veteran HUBBer
  
Join Date: May 2005
Location: Kent, England
Posts: 120
Wink Fuel Starvation
Hi Bobby,

I have a MZ Baghira with the same XTZ660 engine, and my guess it is fuel starvation - you did say it would not run without air filter!

Things to check are , is good delivery from tank petcock?, is filter to petcock clear?, delivery line to carb in good condition and not kinked, connection tube between primary carb float bowl and lower end of Seconday carb - is this clear?, and lastly is the very small fuel filter, that sits on top of inlet valve (you will have to remove it - one screw) to the float bowl on the primary carb, clear?

Best wishes

Alec
__________________
I wanna go back.
Reply With Quote
  #10  
Old 1 Dec 2006
Registered Users
HUBB regular
  
Join Date: Oct 2006
Location: tenerife
Posts: 75
And The Winner Is................!!!!!????
the adjustment between first and second carb body...someone in its life has fiddled with the screws..the throttle was opening ok but not opening the second body butterfly correctly.......aaaargh!!!
RUNS FINE NOW.....!
Reply With Quote
Reply

« Previous Thread | Next Thread »

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
1150 GSA problem Thermal BMW Tech 10 29 Jul 2006 21:15
Tenere reserve tanks problem... TahoeTenere Yamaha Tech 5 5 Jun 2006 23:22
1150GS starting problem? Steve Pickford BMW Tech 4 19 Feb 2006 03:57
1VJ persistent stalling problem. lee5500 Yamaha Tech 6 4 May 2004 15:00
F650/PD Stalling problem Neva Ierace BMW Tech 5 18 Oct 2003 05:54

 
 

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

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!

Your ad could be here, on EVERY page of the HUBB, or the whole website, or as many as you like!

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 12:37.

Contact Us - Horizons Unlimited Motorcycle Travellers Website - Archive - Privacy Statement - Top