Go Back   Horizons Unlimited - The HUBB > Technical, Bike forums > Yamaha Tech
XT225 - engine shuts down in extreme heat XT225 - engine shuts down in extreme heat
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 Giovanni Lamonica, Aralsk, Kazakhstan.

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


Photo by Giovanni Lamonica,
Aralsk, Kazakhstan.



Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 18 Mar 2011
Registered Users
New on the HUBB
  
Join Date: Sep 2010
Location: Benin
Posts: 17
XT225 - engine shuts down in extreme heat
Hi Folks, Greetings from Bamako. We've made it through Benin, Togo, Ghana, Burkina Faso, and now we're finally in Mali. It's hot! and the bikes are complaining. I'm on a Yamaha XT225 Serow from the early 1990's. In the heat of the day (110+ degrees F), the engine shuts off, like I'm running out of gas. If I wait in the shade five minutes, it starts up again without a problem. I recall reading something about this phenomenon in Chris Scott's Adventure Motorcycle Handbook, but I don't have the book with me. Something about gas vaporizing in the fuel line so it doesn't reach the carb. Any ideas/suggestions? The carb is pretty well adjusted, and the bike runs great in the mornings and evening. Unfortunately we've got lots of distance to cover, and we can't simply avoid riding in the mid-day heat. Thanks! Christoph PULAKU | the fulani photo-documentary project
Reply With Quote
  #2  
Old 18 Mar 2011
Registered Users
Veteran HUBBer
  
Join Date: Apr 2003
Location: Manchester UK
Posts: 235
I had a similar problem after rebuilding my XT600Z. For me it was the twin petcocks either side of the fuel tank were joined by a T piece before reaching the carb. I had underestimated the length of fuel hose required leading to:

1) the fuel hose was to close to the engine allowing the fuel to become fairly warm
2) there was a U bend in the pipe. Only instead of u it was n if you get my drift.

This allowed for for the heated fuel to create a vapour lock preventing further fuel flow. Whether you have this issue (vapour lock in a proud bend of the pipe) or simply your bike is overheating and the jet sizes of your carb were on the tad rich side to begin with I couldnt say.
Heated air does affect the stoichiometric ratio as the Mass Air Fuel Ratio lowers with less dense heated air.

You might also want to check obvious issues such as fuel flow to the carbs and continued good flow once the carb bowls drain bolts have been loosened. If you do have a vapour lock fuel flow problem your engine / exhaust will start making popping noises and loose power gracefully before cutting out. If it's a richenning out issue the engine will sound like it's burbling and hesitantly bogg down before cutting out.
Reply With Quote
  #3  
Old 19 Mar 2011
Registered Users
Veteran HUBBer
  
Join Date: Jan 2001
Location: Stockholm
Posts: 651
vapour lock
The problem has all the symptoms of vapour lock. Check that the line from the tank to the carb runs everywhere well clear of hot parts. If you have an inline filter installed it should be somewhere where it gets free cold air flow, so not behind the cilinder or something.
If the bike runs great in the mornings and evenings there'll be nothing wrong with jets or settings - the higher temperatures in the middle of the day would maybe make it run a little rough at idle, but would certainly not make it cut out at speed as if running out of gas.

Did you install an aftermarket tank? They tend to reduce 'ventilation' around the cil head / carb area.
You could consider to wrap fuel lines and filter, if installed, in aluminium foil to keep the heat out.

Luck!
__________________
Auke
http://aukemarieke.blogspot.com
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
Bike shuts off DRZ400S2007 Suzuki Tech 3 16 Feb 2016 22:23
Bike shuts off DRZ400S2007 Tech 0 19 Jul 2009 21:22
Core Cooler - Keeping Cool In Extreme Heat XT GIRL Camping Equipment and all Clothing 8 14 Jul 2009 06:53
Any tips against extreme heat? Dodgydago BMW Tech 16 8 Jul 2007 20:34
CB750 or xt225 PatOnTrip Which Bike? 9 17 Dec 2006 07:55

 
 

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 04:07.

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