Go Back   Horizons Unlimited - The HUBB > Technical, Bike forums > Yamaha Tech
Higher Rev Misfires Higher Rev Misfires
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 28 Aug 2003
Registered Users
HUBB regular
  
Join Date: Aug 2003
Location: Devon,UK
Posts: 47
Higher Rev Misfires
Hi,
I'm kind of new to this game. After 10 years of bicycle touring I've decided to move into engines and bought Dan Walsh's old XT600E. A 2000 model. It had been standing about 7 Months. I have cleaned it out, replaced the plug, oil, filters etc and cleaned out the carb. It starts well. Accelerates nicely. But at a constant 3000 revs misfires badly. Any Ideas.

Cheers George
Reply With Quote
  #2  
Old 31 Aug 2003
Registered Users
Veteran HUBBer
  
Join Date: Aug 2002
Location: Hendrik Ido Ambacht, Holland
Posts: 360
How do you know the revs if this one doesn't have a revcounter?
And you're not supposed to run this engine at 3000 rpm. Best is not to let it get below 3800.

------------------
Fred, XTZ660, Holland.
__________________
Fred, XTZ660, Holland.
Reply With Quote
  #3  
Old 31 Aug 2003
Contributing Member
Veteran HUBBer
  
Join Date: Aug 2002
Posts: 284
Hi George,
Have you searched through this bulletin board?
There are a few threads on XT's misfiring.
My '88 Tenere was misfiring at about 5000revs, which was a product of heaps of small problems.
Most of these are mentioned on this site,
but start by cleaning all electrical contacts incl. the earth.
Geoff
Reply With Quote
  #4  
Old 31 Aug 2003
Registered Users
Veteran HUBBer
  
Join Date: May 2003
Location: England
Posts: 106
Hello there - no advice on misfire, but seem to recall I saw the bike on show at NEC some time ago. It had a massive ding in the front rim. Best of luck with new hobby. I'm new to XT's too and have done a bit of cycle touring. All your old routes will be good on XT especially Highlands. Agree you should do thorough check of all electrics for a start. Also think it's ok to run at 3000rpm as long as you are not trying to accelarate, climb hills etc.
Reply With Quote
  #5  
Old 4 Sep 2003
Registered Users
HUBB regular
  
Join Date: Aug 2003
Location: Devon,UK
Posts: 47
Many Thanks for the replies.
Hoping to get a bit of time soon to have a good look at the electrics although I'll be working a little blind.
Yup the ding in the front wheel is still there. Might need a little careful attention with a hammer or even a new one. I'll have a further cruise through the site and see what I come up with.
The 3000 rpm was only intended as a guide, but it's really at any constant running speed that the misfire kicks in. I haven't been out that much since kangerooing around the streets of Cardiff isn't really my idea of fun.
Happy travels everyone
Reply With Quote
  #6  
Old 4 Sep 2003
Registered Users
Veteran HUBBer
  
Join Date: Aug 2002
Location: Hendrik Ido Ambacht, Holland
Posts: 360
If it's at any constant speed I would chck the connection rubbers between the cylinder head and the carbs.

------------------
Fred, XTZ660, Holland.
__________________
Fred, XTZ660, Holland.
Reply With Quote
  #7  
Old 16 Sep 2009
Registered Users
HUBB regular
  
Join Date: May 2009
Posts: 24
xt 600 missfire
Quote:
Originally Posted by Geoff van de Merwe View Post
Hi George,
Have you searched through this bulletin board?
There are a few threads on XT's misfiring.
My '88 Tenere was misfiring at about 5000revs, which was a product of heaps of small problems.
Most of these are mentioned on this site,
but start by cleaning all electrical contacts incl. the earth.
Geoff
Hey there,

Was wondering if you can remember what caused your xt 600 to missfire at 5000 revs? I have a 1984 Xt 600 43F that does the same thing. It's definately electrical. I've bought a new CDI, swapped coils from my other XT 600, new plug, disconnected kick stand switch, new igniton switch and on/off switch, new battery..... all making no difference! I'm currently having my stator rewound, hoping that's it. If you have any new ideas.... help!! The bike only has 5900 miles and is very clean.

Thanks, Baron
Reply With Quote
  #8  
Old 16 Sep 2009
bacardi23's Avatar
Registered Users
Veteran HUBBer
  
Join Date: Sep 2007
Location: XXX<-Portugal->Azores->Santa Maria (island)
Posts: 1,544
once I found out I had the turn signals relay loose and it had already broken the outside of its casing...when it touched the frame it would make my XT misfire.... the relay on my bike is fitted with a rubber band onto the isde of the battery box behind the left seat side panel....mine is a 1990 XT600E


Vando
Reply With Quote
  #9  
Old 16 Sep 2009
Registered Users
Veteran HUBBer
  
Join Date: Aug 2009
Location: Dorset UK
Posts: 395
If its at constant throttle, the carb will be running on the "pilot system" - up to 1/8 throttle approx. Worth taking the carb off & giving it a real good clean & check over. Is it all standard air box, filter & exhaust.
Dan was NOT known for mechanical empathy - (great book "These are the things that should happen to you" or sumink like that!)
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

 
 

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 03:54.

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