Go Back   Horizons Unlimited - The HUBB > Technical, Bike forums > Yamaha Tech
Carb Help Needed Carb Help Needed
Register FAQ Calendar Search Today's Posts Mark Forums Read
Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
Photo by Ellen Delis, Lagunas Ojos del Campo, Antofalla, Catamarca

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


Photo by Ellen Delis,
Lagunas Ojos del Campo,
Antofalla, Catamarca



Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 6 Oct 2006
chipompom's Avatar
Registered Users
New on the HUBB
  
Join Date: Sep 2006
Location: uk
Posts: 17
Carb Help Needed
Guys,

On the secondry carb is an upward facing tube connection that works the slide, where does this connect to and is it positive pressure or vacuum????

The airbox has been removed and 2 pancake filters installed. When i turn the throttle full the slide doesn't move!!!!

Cheers

Paul
Reply With Quote
  #2  
Old 6 Oct 2006
chipompom's Avatar
Registered Users
New on the HUBB
  
Join Date: Sep 2006
Location: uk
Posts: 17
Ignore the last post I was having a senior moment

The problem I'm having is the bike wont pull strongly from about 4500 rpm, taking the airfilters off and looking at the slides the secondry slide doesn't lift smoothly (although it isn't sticking) it sort of bobs up and down just short of half open. The diapragm is ok

I am at a loss

Any help would be appreciated

Thanks

P
Reply With Quote
  #3  
Old 6 Oct 2006
Registered Users
Veteran HUBBer
  
Join Date: Jan 2001
Location: Stockholm
Posts: 651
Mysterious carbs
What bike do you have exactly?
On the right hand carb there is two connections, (A) one for air pressure = 'connected' to air filter outlet or outside air respectively and, (B) just upstream of the rubber connection to the cyl head there is a connection for a small hose that goes to the mixture enriching device (valve) on the primary carb.

(A) provides the higher pressure on one side of the mebrane to lift the slide of the second stage, as under the slide there wil be lower pressure that is 'communicated' to the other side of the membrane via the small vertical hole in the slide.

If the bike is stationary, ie. you are not loading th engine, there is no way you'll be able to keep the second carb open, as the load is just never sufficient to provide a sufficient airflow through the second carb. So, for me there is no proof your second stage is malfunctioning.

Are the airfilters clean and large enough? Try a short stretch without and see what happens?

I hope the description above is understandable, it is late in the afternoon and description of carbs in text I find difficult at the best of times.

Auke
__________________
Auke
http://aukemarieke.blogspot.com
Reply With Quote
  #4  
Old 6 Oct 2006
chipompom's Avatar
Registered Users
New on the HUBB
  
Join Date: Sep 2006
Location: uk
Posts: 17
Thanks Auke,

Sorry for the poor description, re read it my self and it only just makes sense

Its a 1991 XTZ660 Tenere, the airbox has been removed and most of the bodywork also.

I've recently had new camchain and guides fitted, but while the guy did a good job on the engine he didn't look at the carbs.

I had the carbs off today and gave them a bit of a clean out and its getting a bit better, i will try it under load on the way home from work tonight. I think the problem was a bit of cack got in there when i ran out of petrol (forgot to take it off reserve)

Again, sorry for being so vauge.

Thanks for the help

Paul
Reply With Quote
  #5  
Old 6 Oct 2006
Livotlout's Avatar
Contributing Member
Veteran HUBBer
  
Join Date: May 2005
Location: Kent, England
Posts: 120
Thumbs up
Hi Paul

Could be fuel starvation, you did say you ran out of fuel, this may have caused partial blockages - check petcock (and filter if it has one), any in line filters, kinked hose, fuel link hose between primary carb float bowl and secondary carb, finally check filter that sits above the inlet valve to the primary carb float bowl (you will have to remove valve body - one screw, filter sits on top of it).
I'm giving this advice on the assumption your set up is the same as on my MZ Baghira - XTZ660 engine.

Best of luck

Alec
__________________
I wanna go back.
Reply With Quote
  #6  
Old 6 Oct 2006
Livotlout's Avatar
Contributing Member
Veteran HUBBer
  
Join Date: May 2005
Location: Kent, England
Posts: 120
Smile
Paul

The final item (valve) I refered to in the last post, is item no 43 in the attached pic :-


http://i103.photobucket.com/albums/m...tlout/h-06.gif

Again, best of luck

Alec
__________________
I wanna go back.
Reply With Quote
  #7  
Old 9 Oct 2006
chipompom's Avatar
Registered Users
New on the HUBB
  
Join Date: Sep 2006
Location: uk
Posts: 17
HI Alec,

Thanks for the help (my works server wont let me look at the pic could you mail it to me on please)

I put a single dose of Redex carb cleaner in and its starting to get better, i think i'll add a bit more before my long ride out this weekend and see how it goes

Thanks for the help all. I hope to return the favour one day

Paul
Last edited by chipompom; 10 Oct 2006 at 08:05.
Reply With Quote
  #8  
Old 9 Oct 2006
Livotlout's Avatar
Contributing Member
Veteran HUBBer
  
Join Date: May 2005
Location: Kent, England
Posts: 120
Thumbs up
Hi paul

EMail sent

Alec
__________________
I wanna go back.
Reply With Quote
  #9  
Old 10 Oct 2006
chipompom's Avatar
Registered Users
New on the HUBB
  
Join Date: Sep 2006
Location: uk
Posts: 17
Cheers Alec, It all make sense now. many thanks

Paul
Reply With Quote
Reply

« Previous Thread | Next Thread »

Currently Active Users Viewing This Thread: 1 (0 Registered Users and/or Members and 1 guests)
 
Thread Tools
Display Modes
Linear Mode Linear Mode

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
Carb' overhaul advice Mark Yamaha Tech 13 24 Mar 2008 15:05
LC4 Carb ash_d KTM Tech 13 6 Oct 2005 12:00
carb sync troubles... jim Yamaha Tech 6 22 Jun 2004 21:54
carb adjustment ShaunC Yamaha Tech 3 29 Apr 2004 17:11
Carb questions Finian Yamaha Tech 5 11 May 2003 22:37

 
 

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

HU Event and other updates on the HUBB Forum "Traveller's Advisories" thread.
ALL Dates subject to change.

2024:

Add yourself to the Updates List for each event!

Questions about an event? Ask here

HUBBUK: info

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...

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 15:21.

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