Go Back   Horizons Unlimited - The HUBB > Technical, Bike forums > Yamaha Tech
Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
Photo by Hendi Kaf, in Cambodia

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


Photo by Hendi Kaf,
in Cambodia



Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 11 Aug 2013
Registered Users
New on the HUBB
 
Join Date: Aug 2013
Posts: 2
Backfire on overrun

Hi folks. Just bought myself an xt600 3aj and absolutely love it. Ive had a general mix of bikes xv1700, fjr1300, triumphs, fj1200 etc etc etc and recently decided I wanted an 80's thumper and wish I had done it years ago. One I bought is a good example. 53k on clock, runs great. Only issue I have come across is this almighty backfire when closing the throttle on overrun. It only does it if the revs are high when you shut the throttle. If I decelerate gently it is ok. Iv'e given a few pedestrians a severe shock when passing them as it really is quite loud. Any pointers greatly appreciated.
Thanks
Angus.
Reply With Quote
  #2  
Old 11 Aug 2013
Registered Users
Veteran HUBBer
 
Join Date: Dec 2008
Location: Denmark
Posts: 1,417
An leaky exhaust-system will do that aswell, so make sure all connections are tight
Reply With Quote
  #3  
Old 11 Aug 2013
xtrock's Avatar
Registered Users
Veteran HUBBer
 
Join Date: May 2013
Location: Norway
Posts: 1,371
Check the intake boots, maybe sealing ring is not good.
Reply With Quote
  #4  
Old 17 Aug 2013
Registered Users
Veteran HUBBer
 
Join Date: Jun 2008
Location: yorkshire england
Posts: 201
hi there as mezo says its proberbly the coasting enricher diafram once you have removed the small cover on the side of the carb carefull of the spring remove the diafram and check it for holes etc . under the diaframe on the carb body there will be a small brass pin/plunger there will be a very small screw at the side of it . this pin/plunger must move in when you press it, it is spring loaded so will move in and out. if it does not move the internal plunger is siezed . undo the screw you will notice the carb body is slightly peened over on to the plunger bit , see the two small marks . grab the bit sticking out and pull to remove but if its siezed bad you could have a problem dont forget the plunger/pin is brass. it may be possibal to get some wd40 etc down the side of the pin/plunger to free it off if you are unsure get someone to have a look . then just clean it all up and put back together ,no more back fireing . good luck zigzag
Reply With Quote
  #5  
Old 17 Aug 2013
Registered Users
Veteran HUBBer
 
Join Date: Sep 2012
Location: Middle USA
Posts: 349
At least the US version comes as a kit with the diaphram and the brass valve. I just rebuilt 2 sets of carbs and replaced the diaphram and brass valve assy. It should come out fairly easily. Mine was not seized but did have the two marks on the valve. I think this may have been part of the assembly process. I did not find it peened at all. I was able to grab a hold of the brass valve on the lip sticking out and wiggle it out.
Reply With Quote
  #6  
Old 22 Aug 2013
Registered Users
New on the HUBB
 
Join Date: Aug 2013
Posts: 2
Thanks for replies guys.Much appreciated. I will investigate this weekend.
Reply With Quote
Reply


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
back fire... sidecarmx Yamaha Tech 7 26 Sep 2012 00:08

 
 

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

25 years of HU Events
Be sure to join us for this huge milestone!

ALL Dates subject to change.

2025 Confirmed Events:

Virginia: April 24-27
Queensland is back! May 2-5
Ecuador June 13-15
Germany Summer: May 29-June 1
CanWest: July 10-13
Switzerland: Date TBC
Ecuador: Date TBC
Romania: Date TBC
Austria: Sept. 11-14
California: September 18-21
France: September 19-21
Germany Autumn: Oct 30-Nov 2

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!

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 02:15.