Go Back   Horizons Unlimited - The HUBB > Technical, Bike forums > Yamaha Tech
The saga continues! The saga continues!
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 George Guille, It's going to be a long 300km... Bolivian Amazon

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


Photo by George Guille
It's going to be a long 300km...
Bolivian Amazon



Reply
Page 1 of 2 1 2
 
LinkBack Thread Tools Display Modes
  #1  
Old 31 May 2007
Registered Users
HUBB regular
  
Join Date: Jan 2002
Location: Scotland
Posts: 66
The saga continues!
I have now replaced the relays, rectifier, starter button and neutral switch. The bike is now giving a nice healthy spark, but will only run for about 3 minutes. Stripped and cleaned the carbs yesterday, not had a chance to try it today, but will try and get a look tommorow.

We also checked for sticky valves, and all appears to be ok. Have rigged up an alternative fuel supply, and put an HT tester on the plug so we can check if the spark is staying strong. Hopefully this will give us conclusive proof of whether or not the engine is losing it's spark while running. There was dirt in the carbs, but nothing too excessive, may have been enough to clog the jets though. Also using fresh fuel to try it out.


Fingers crossed!

Pete
Reply With Quote
  #2  
Old 31 May 2007
Brian Williams's Avatar
Contributing Member
Veteran HUBBer
  
Join Date: Oct 2006
Location: england
Posts: 137
Here is something else to try. My XT600 3AJ was sluttering at high revs. Felt like fuel problem, so cleaned out the carb. Found red fluff in float valve filter, turned out to be the paper from the inline filter had broken up. It also slightly clogged up the fuel pump. Not sure if you use inline fuel filters, but it might be worth checking the fuel pump for muck, tends to get neglected.
__________________
rust & dust
Reply With Quote
  #3  
Old 31 May 2007
Registered Users
HUBB regular
  
Join Date: Jan 2002
Location: Scotland
Posts: 66
Thanks for that, somethin else to check out at the weekend.

Pete
Reply With Quote
  #4  
Old 31 May 2007
Contributing Member
Veteran HUBBer
  
Join Date: Mar 2003
Location: London,England
Posts: 358
When you cleaned the carbs did you check the small filter under the float needle held in place by the philips screw.
This can get blocked causing fuel starvation and engine to stop but engine will restart once fuel passes through the blocked filter.
Reply With Quote
  #5  
Old 31 May 2007
Registered Users
HUBB regular
  
Join Date: Jan 2002
Location: Scotland
Posts: 66
Quote:
Originally Posted by bolla View Post
When you cleaned the carbs did you check the small filter under the float needle held in place by the philips screw.
This can get blocked causing fuel starvation and engine to stop but engine will restart once fuel passes through the blocked filter.
No, didnt check that, another job for Saturday.

Thanks for that.

Pete
Reply With Quote
  #6  
Old 6 Jun 2007
Registered Users
HUBB regular
  
Join Date: Jan 2002
Location: Scotland
Posts: 66
The XT still has a strong spark, but still not runnin right.

We tried some easy start in the carbs, fired instantly and ran for a good 5 minutes, before cutting out. Fired again instantly with another whiff of the evil stuff, and ran again, but cut out. Third time, it backfired and blew the carbs off again.

Cant find any mention in the manual of this wee filter in the carb, so haven't managed to check it yet. Could it be a mix up with some of the hoses on the carb? Getting a good strong regular blue spark, so I think all the electrical demons are gone.

Any ideas?

Pete
Reply With Quote
  #7  
Old 6 Jun 2007
Brian Williams's Avatar
Contributing Member
Veteran HUBBer
  
Join Date: Oct 2006
Location: england
Posts: 137
To find the float valve filter, remove float bowl, remove float and valve. You will find filter underneath where the valve sat, its rather small wire gauze, I think there might be a philips screw holding it in place. Hope this helps.
__________________
rust & dust
Reply With Quote
  #8  
Old 6 Jun 2007
Contributing Member
Veteran HUBBer
  
Join Date: Mar 2003
Location: London,England
Posts: 358
Had a look in my clymer XT600 manual page 239
note no.10
Remove the screw securing the fuel valve seat and remove the fuel valve seat

You will find the filter here.

Good luck
Reply With Quote
  #9  
Old 7 Jun 2007
Registered Users
HUBB regular
  
Join Date: Jan 2002
Location: Scotland
Posts: 66
Thanks for that guys, I'll have a look ASAP

Pete
Reply With Quote
  #10  
Old 11 Jun 2007
Registered Users
HUBB regular
  
Join Date: Jan 2002
Location: Scotland
Posts: 66
Quote:
Originally Posted by Basspete View Post
I have now replaced the relays, rectifier, starter button and neutral switch. The bike is now giving a nice healthy spark, but will only run for about 3 minutes. Stripped and cleaned the carbs yesterday, not had a chance to try it today, but will try and get a look tommorow.

We also checked for sticky valves, and all appears to be ok. Have rigged up an alternative fuel supply, and put an HT tester on the plug so we can check if the spark is staying strong. Hopefully this will give us conclusive proof of whether or not the engine is losing it's spark while running. There was dirt in the carbs, but nothing too excessive, may have been enough to clog the jets though. Also using fresh fuel to try it out.


Fingers crossed!

Pete
Ok I just got the carb off at the weekend and there was flakes of paint in the wee filter behind the jet. Next stage is to bybass the fuel pump, but didnt get the chance to try it. The bike was sparking away good style right up till it stopped. If it runs, we'll blow out the pump with the airline and stick inline filters into the feeds from the tank, or just run it without the pump.

Hopefully this will put an end to this bloody infuriating story.

Pete
Reply With Quote
  #11  
Old 11 Jun 2007
Brian Williams's Avatar
Contributing Member
Veteran HUBBer
  
Join Date: Oct 2006
Location: england
Posts: 137
Lets hope you have found the cause.
__________________
rust & dust
Reply With Quote
  #12  
Old 27 Jun 2007
Registered Users
HUBB regular
  
Join Date: Jan 2002
Location: Scotland
Posts: 66
Well Ive now removed the fuel pump, put fresh fuel in the tank, and it's still the same. I still have a good healthy spark, and there is fuel getting to the carbs. But the bloody thing wont run for more than a couple of minutes.

The carbs were stripped, cleaned and blown out with an airline.

Am I missing something totally obvious, or is the obvious thing to sell it and cut my losses?

Pete
Reply With Quote
  #13  
Old 27 Jun 2007
Registered Users
Veteran HUBBer
  
Join Date: Mar 2007
Location: UK
Posts: 4,343
Wink Spark + fuel = explosion, every time!
Pete,
I know how you feel (reasons x many in my posts of recent past!).

Could you have an airlock forming in your fuel tank after running the engine for a few minutes - mine certainly gets a lack of atmos pressure in there and I loosen the cap occasionally; there is always a hiss of air going into there.

Might be worth reading back over earlier threads about running problems for the XT/TT - this has helped me a lot to get new angles on a problem.

Alternatively or as well as, review what has changed - what has caused this to start now? Summarise and recap the issues in this thread - I have found that over time I have lost sight of the obvious!!

I hope this helps, if only a bit!

Dave
__________________
Dave
Reply With Quote
  #14  
Old 27 Jun 2007
Registered Users
HUBB regular
  
Join Date: Jun 2007
Location: notts
Posts: 37
starting probs.
try taking the coil off and sanding the frame behind to bare metal.spray on some wd40 and rebuild.this helped my tt600r.also set all carb to factory settings.ie.float,idle air screw etc.my bike runs and starts great at 3.25 turns out.also set auto decomp cable.i can now start my bike 1/2 kicks hot or cold.
Reply With Quote
  #15  
Old 27 Jun 2007
Registered Users
Veteran HUBBer
  
Join Date: Mar 2007
Location: UK
Posts: 4,343
XT v's TTR
Ade,
Pete has an XT which may not have the same carb (or decomp cable, esp if it has a starter motor) - but what do I know!

For the record, when I had my carb out recently I checked the idle screw and it is at 2.5 turns out from fully in - it works for me, so I have left it there (another thing that I have fiddled with in the past couple of months). The old spark plug is a healthly colour at this setting.

Dave
__________________
Dave
Reply With Quote
Reply
Page 1 of 2 1 2

« 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
Insurgency continues around Kidal Richard Washington North Africa 3 25 Oct 2006 13:01

 
 

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 12:16.

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