Go Back   Horizons Unlimited - The HUBB > Technical, Bike forums > Honda Tech
honda xr650r backfiring, help needed !!!!!! honda xr650r backfiring, help needed !!!!!!
Register FAQ Calendar Today's Posts
Honda Tech Honda Tech Forum - For Questions specific and of interest to Honda riders only.
Photo by Ellen Delis, Lagunas Ojos del Campo, Antofalla, Catamarca

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


Photo by Ellen Delis,
Lagunas Ojos del Campo,
Antofalla, Catamarca



Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 21 Jan 2009
Registered Users
HUBB regular
  
Join Date: Feb 2002
Location: charlwood surrey
Posts: 61
honda xr650r backfiring, help needed !!!!!!
hi all , i have a problem that is taxing my fixing skills, well here goes, i have a honda xr650r i got it after it had sat in a shed for 5 years doing very little, it has 1000k,s from new and it,s a 2000 model, when i got it i put new fuel in gave it a oil change and filter checked it over, then gave it a run, my problem is that when warm if i open the throttle and hold itat 1/2 throttle it backfires through the exhaust and pops and bangs , here is a list of things i have checked.
1, new spark plug N.G.K iridium
2,carb taken apart cleaned , jets checked 175 main , 65 pilot, air screw 1 3/4 out, needle 2nd notch from bottom
3,cylinderhead to carb rubber checked
4,decompressor checked and adjusted
5,valve,s checked exhaust 0.20 inlet 0.15
6, all electrical connections checked , all clean
7, coil lead checked, and plug cap ,all good
8,running unleaded supreme
9,air filter clean and in good condition
10, exhaust standard but with unrestricted baffle
the symtons all point to a air leak, and running lean but i can,t seem to find a cause, well chaps theres something to get your teeth into, any thoughts kindly appreciated, thanks alot freddy
Reply With Quote
  #2  
Old 22 Jan 2009
*Touring Ted*'s Avatar
Contributing Member
Veteran HUBBer
  
Join Date: Jul 2005
Location: Wirral, England.
Posts: 5,656
You've got an unrestricted exhaust but standard jetting... You bike is probably running a little lean (backfiring is burning air)...

My XR used to pop and bang with my unbaffled pipe too.

How is the power ?? Pulling smootly and cleanly ??
__________________
Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
Reply With Quote
  #3  
Old 22 Jan 2009
Registered Users
HUBB regular
  
Join Date: Feb 2002
Location: charlwood surrey
Posts: 61
hi ted
hi there mate, thanks for taking the time to reply, my bike was popping and banging with the standard pipe insert in, i know the history of the bike and it was as it was as it came from the factory, anyway this afternoon i decided to take your advice and mess around with the jetting, i have gone up one size on the main , this made a considerable difference, so tomorrow i am going to order some jets and a larger slow running jet , and take it from there, i just find it hard to believe a bike could come that lean from the factory, well once again ted thanks for the nudge on what to look for, good work, cheers freddy
Reply With Quote
  #4  
Old 22 Jan 2009
*Touring Ted*'s Avatar
Contributing Member
Veteran HUBBer
  
Join Date: Jul 2005
Location: Wirral, England.
Posts: 5,656
Is yours a UK or US bike ?? There is a MAJOR differnce in them... Sounds like Uk from the jet specs though..

I upped my main jet to one bigger.. It solved the popping but it also make it very "boggy" on acceleration..

Mine was a BITCH to start until I upped the pilot jet (slow running jet) and it made a considerable difference in a good way...

If you find that your new bigger main jet is too "boggy", put the original back in but raise the clip a notch and try that.

Most MX bikes come lean from the factory to get through emmisions laws so dont be surprised. If your bike starts ok from cold, then i dont recommend messing with the pilot jet... Do you need choke ???? how many kicks from cold ??


If you search my old threads from about 2005, 2006 (when I had my XR650's), I posted all about my jetting and the sizes I used.....

Best regards, ted
__________________
Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
Reply With Quote
  #5  
Old 24 Jan 2009
Registered Users
HUBB regular
  
Join Date: Feb 2002
Location: charlwood surrey
Posts: 61
hi ted
hi there ted, yeah my xr is a uk spec bike, i have got a 178 main and a 180, i have also got a 68 pilot that i am going to exsperiment with, althought in saying that i put the 178 in and the bike came to life , what i was after all along , it is no problem to start from cold or if it,s hot, i still find it hard to believe that they would let a bike out the show room running like that, as i know for sure that it has not been touched since it had its p.d.i !! i will look back at your thread s and see if i can,t gleam some more useful info , thanks again for taking the time to reply, freddy
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
Honda XR650R Engine Oil hotspur84 Honda Tech 15 8 Jun 2012 00:14
Honda XR650R - any comments? buebo Which Bike? 12 3 Oct 2008 09:35
XR650R fan - help needed Donogh Honda Tech 5 15 May 2008 12:02
Buy Honda xr650r or xr650l mjp.xrl Honda Tech 14 25 Oct 2005 16:42
(UK) Honda XR650R Rally / Adventure Bashplate coolkarim TRAVEL Equipment for Sale / Wanted 8 7 Dec 2004 04:22

 
 

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 22:00.

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