Go Back   Horizons Unlimited - The HUBB > Technical, Bike forums > BMW Tech
backfire on f650 backfire on f650
Register FAQ Calendar Today's Posts
BMW Tech BMW Tech Forum - For Questions specific and of interest to BMW riders only.
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 22 Sep 2005
Registered Users
New on the HUBB
  
Join Date: Jul 2005
Location: uk
Posts: 8
backfire on f650
Hello, my F650 funduro backfires when rolling off the throtle, but only when your giving it some gusto. The exhaust is standard and I have just had the original carbs balanced ( which were fine )and the nuts tightened on the exhaust. The guy in the garage said the gas emissions analyzing machine???? showed everything to be fine which would indicate no problems with shims. I have'nt checked shim clearance yet as its a job i want to try and avoid but can not think of anything else. Any ideas???
Reply With Quote
  #2  
Old 22 Sep 2005
ozhanu's Avatar
Contributing Member
Veteran HUBBer
  
Join Date: Feb 2005
Location: Izmir, Turkiye
Posts: 794
just an idea, be sure both of your sparks work well. Also avoid using chooke.

good luck

------------------
ride safely
ozhan u.
'97 F650
www.ozhanu.com/gezi
__________________
ozhan u.
website under construction
Reply With Quote
  #3  
Old 23 Sep 2005
Registered Users
New on the HUBB
  
Join Date: Jul 2005
Location: uk
Posts: 8
thanks. both spark plugs were new two weeks ago.
Reply With Quote
  #4  
Old 7 Oct 2005
Nigel Marx's Avatar
Super Moderator
Veteran HUBBer
  
Join Date: Oct 2000
Location: South Island, New Zealand
Posts: 798
My Funduro has always very occasionally done this for the 5 years I have owned it. I think it's something that some of them do.
Regards
Nigel in NZ
__________________
The mouth of a perfectly contented man is filled with . -- 2200 BC Egyptian inscription
Reply With Quote
  #5  
Old 8 Oct 2005
Contributing Member
Veteran HUBBer
  
Join Date: Jun 2005
Location: cardigan,wales
Posts: 249
Recently there was a similar thread about KTM backfiring.Usually the cause is a very small exhaust leak letting air into the system,or the tickover being set a little too low.If the tickover speed when hot,is under 1500rpm,increase it to this speed and see if that makes any difference.My XL600 does it just before it needs to be switched onto reserve,meaning it's starting to run a bit lean.Handy really as i don't get that "oh faaarrrkkkk,not now"moment as i try to overtake something and it splutters on the last drip of petrol before i can reach the tap!

------------------
Just going for a short ride on my bike....
__________________
Just going for a short ride on my bike....
Reply With Quote
  #6  
Old 9 Oct 2005
Registered Users
New on the HUBB
  
Join Date: Jul 2005
Location: uk
Posts: 8
thanks chaps.

i've checked and tightened all the exhaust bolts and do not believe there to be an air leak. I had increased the tickover idle a bit and that did seem to help. I might give it another half turn.

spank you smelly crutch
Reply With Quote
  #7  
Old 24 Oct 2005
Smellybiker's Avatar
Registered Users
Veteran HUBBer
  
Join Date: Sep 2003
Location: Missing, presumed fed
Posts: 295
Hi,

I had backfire problems on my F650GSGD, the problem turned out to be a split in the intake pipe between the throttle stub & the cylinder.

Opening the throttle caused the split to open, air leaked in screwing up the mixture, and BOOM.



------------------
Last seen in S.America, missing presumed fed.
http://www.smellybiker.com
__________________
Missing, presumed fed.
https://youtube.com/@ChileBob
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

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!

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 00:45.

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