Go Back   Horizons Unlimited - The HUBB > Technical, Bike forums > Suzuki Tech
vacuum leaks? vacuum leaks?
Register FAQ Calendar Today's Posts
Suzuki Tech Suzuki Tech Forum - For Questions specific and of interest to Suzuki riders only.
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 11 Jun 2007
Registered Users
New on the HUBB
  
Join Date: May 2007
Location: ohio
Posts: 3
vacuum leaks?
Im having a hard time getting my b400 to stay running under 3k rpm. What is the best way to check carbs for possible vacuum leaks, I know they definately need syncd but its kinda hard to do if the bike wont run at a normal idle
Reply With Quote
  #2  
Old 12 Jun 2007
Registered Users
Veteran HUBBer
  
Join Date: Nov 2004
Location: USA
Posts: 992
I've heard it suggested that spraying carb cleaner (and various other fluids) around the manifolds and sealing points while the bike is at idle can identify an intake leak...rpms temporarily increase.
Reply With Quote
  #3  
Old 12 Jun 2007
Nigel Marx's Avatar
Super Moderator
Veteran HUBBer
  
Join Date: Oct 2000
Location: South Island, New Zealand
Posts: 798
What's a B400? I may be able to offer some advice if I know.

Regards

Nigel in NZ
__________________
The mouth of a perfectly contented man is filled with . -- 2200 BC Egyptian inscription
Reply With Quote
  #4  
Old 12 Jun 2007
Registered Users
Veteran HUBBer
  
Join Date: Apr 2003
Location: Cape Town, South Africa
Posts: 303
Nigel: Bandit 400

I also would recomend the spray intake rubbers method. Best stuff to use is cold start aid spray from the automotive dealer or ether from the pharmacist (working ingredience is the same, decide what's easier to get. The cold start spray is available everywhere in cold and arctic climates. The pharmacist might ask questions )
Reply With Quote
  #5  
Old 13 Jun 2007
Nigel Marx's Avatar
Super Moderator
Veteran HUBBer
  
Join Date: Oct 2000
Location: South Island, New Zealand
Posts: 798
Thanks!
After I posted that, I figured as much. I'm wondering if it might be more than an air leak. As a four cylinder, the chances are it is unlikely that more than one inlet manifold would spontaneously have a leak, unless someone has not assembled the carbs properly. I would expect it to idle at better than it is. It is possible, but I would start looking elsewhere first. What sort of carbs does the B400 have? CV or what? If you can get the airbox off and see down the throats (a mirror helps) sometimes you can get a rough sync by getting someone to open the throttle and see if the sliders start moving together.
Here in NZ, we can buy a brand of cold-start that has about the most descriptive name of any product I have seen. It's called "Start, Ya Bastard"!!!
http://www.horizonsunlimited.com/hub...ilies/rofl.gif


Regards

Nigel in NZ
__________________
The mouth of a perfectly contented man is filled with . -- 2200 BC Egyptian inscription
Reply With Quote
  #6  
Old 13 Jun 2007
Registered Users
New on the HUBB
  
Join Date: May 2007
Location: ohio
Posts: 3
the slides are all working together it seems, perhaps they may need thoroughly cleaned would that cause said problem?
Reply With Quote
  #7  
Old 14 Jun 2007
Nigel Marx's Avatar
Super Moderator
Veteran HUBBer
  
Join Date: Oct 2000
Location: South Island, New Zealand
Posts: 798
I have yet to see a problem caused by unclean slides. That would most likely make them stick open and cause reving. Has the bike been left for a period of time unused? Say for 6 months or more? If so, then some fuels can evaporate in the carb float bowls and leave a varnish-like residue that can block off the tiny fuel galleries that feed the idle fuel circuits. Dismantling, and blowing out with compressed air can fix it but if it really badly blocked, using a fuel additive like Seafoam or heating the carb in a 50/50 mix of water and Yamaha carb cleaner for 20 minutes then washing in water and blowing with air will almost always do the trick.

Regards

Nigel in NZ
__________________
The mouth of a perfectly contented man is filled with . -- 2200 BC Egyptian inscription
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
gasket leaking ...big problem or not? Polly Yamaha Tech 81 26 Jun 2007 12:25
Help Please - 34L "popping" jim Yamaha Tech 4 2 Apr 2007 14:20
Bings, 40mm constant vacuum John Roberts BMW Tech 6 5 Mar 2006 07:24
oil leaks gwel Yamaha Tech 2 25 Feb 2006 00:02
XT oil leaks martync Yamaha Tech 1 17 Oct 2003 14:37

 
 

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

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 14:36.

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