Go Back   Horizons Unlimited - The HUBB > Technical, Bike forums > Yamaha Tech
XT600 98 loosing power over 100km/h XT600 98 loosing power over 100km/h
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 Giovanni Lamonica, Aralsk, Kazakhstan.

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


Photo by Giovanni Lamonica,
Aralsk, Kazakhstan.



Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 20 Jul 2018
Registered Users
New on the HUBB
  
Join Date: Jul 2018
Posts: 1
XT600 98 loosing power over 100km/h
This question might have been ask before!

XT600-e 1998 59 000K
Had if for 7 months and great bike I love it
So far I change the spark plug 7000k ago did oil service twice and last one was 1000k ago and air filter was 7000k ago.. I just removed it because I'm getting a new one next week and notice there was oil on/in it and also in the air filter chamber... can it be a real problem or it can be expected from a old XT with 59K
Now the problem is :
When going faster then 100km/h at around 110-120 the bike starts loosing power and kind of chocking on itself like if there was not enough fuel.. if I squeeze the accelerater completely it will keep doing this and slow down to anything between 80-100, if I just let the accelerater go back just a bit it goes back to normal and I can keep riding at 100-105 quite fine but if I snap it all the way the problem persists.

I have no problem from 0 to 100 and the acceleration is quite good but over 100 I just don't get it.. I'm struggling to pass a car or going up big hills at high speed on the highway.

I am learning about bikes everyday so please be patient with me hehe.

I hope I was clear enough in my description..
Cheers!
Reply With Quote
  #2  
Old 20 Jul 2018
Registered Users
Veteran HUBBer
  
Join Date: Feb 2012
Location: Milan, Italy
Posts: 562
welcome onboard, add pics...

oily filter chamber is normal, flooded with oil, not so good

pull out your spark plug and check the color, if very white-ish, then you are suffering a lean condition, i.e. not enough fuel.
most provable cause would be dirty/clogged jets in the carb, or sometimes even water in the bowl.
easy to check, start with the simple stuff, see if it helps.
Reply With Quote
  #3  
Old 21 Jul 2018
Registered Users
Veteran HUBBer
  
Join Date: May 2013
Location: Wisconsin, USA
Posts: 827
One thing many people don't think about when jetting a bike is how airflow is effected at speed . There are some bikes that'll run great to redline in lower gears but at higher speeds they act lean or rich .Any mods done to the airbox can greatly effect this . I see it when running one of my wideband a/f meters . Completely stock setups aren't usually too bad other than a few when certain headwinds or crosswinds .

I'd try going up one size on the main and if it helps , go up another all the while seeing how it's running at slower speeds but higher revs . There is also possible that the slide spring is getting weak and the slide starts sputtering badly at speed as well. If a person puts a camera in the intake tract for veiwing as your riding and most people would be shocked at how badly those cv slide can flutter , no wonder they run horrible .
__________________
'86 XT600/3TB motor,,, '88 XT600, ,,'92 XT600e,,, '08 Husky TE510,,, '05 DRZ463,,, '95 KLX650 ,,,'96 KLX650
Reply With Quote
  #4  
Old 22 Jul 2018
Registered Users
Veteran HUBBer
  
Join Date: Dec 2008
Location: Denmark
Posts: 1,417
Check the floatheight, it the fuellevel is too low, the bike will starve for gas at higher speeds. Had this exact problem on a friends xt550. Also check the filter under the floatvalve.

I wouldnt mess with jetting, all my tests have shown that theese bikes are slightly too rich at the mainjets, even with a higher flowing exhaust and modified air intake/filters. This is backup up by dyno runs and my of test with air/fuel tests with a lambda prope in the header on my exhaust. I've never experienced the stuff JJ writes,but have heard about it with pod filters mounted directly on the carb. So I guess theres a lot of variantions to consider.

Oil in the airbox is often becasue the bike is overfilled with oil.

I can highly recommend this supercheap carb rebuild kit: https://www.ebay.com/itm/Yamaha-Carb...from=R40&rt=nc
Reply With Quote
  #5  
Old 30 Jul 2018
Registered Users
New on the HUBB
  
Join Date: Jul 2016
Posts: 12
Quote:
Originally Posted by Jens Eskildsen View Post
Check the floatheight, it the fuellevel is too low, the bike will starve for gas at higher speeds. Had this exact problem on a friends xt550. Also check the filter under the floatvalve.

I wouldnt mess with jetting, all my tests have shown that theese bikes are slightly too rich at the mainjets, even with a higher flowing exhaust and modified air intake/filters. This is backup up by dyno runs and my of test with air/fuel tests with a lambda prope in the header on my exhaust. I've never experienced the stuff JJ writes,but have heard about it with pod filters mounted directly on the carb. So I guess theres a lot of variantions to consider.

Oil in the airbox is often becasue the bike is overfilled with oil.

I can highly recommend this supercheap carb rebuild kit: https://www.ebay.com/itm/Yamaha-Carb...from=R40&rt=nc
Hello, 130/110/50 will be better than the original 130/120/46?
Reply With Quote
  #6  
Old 31 Jul 2018
Registered Users
New on the HUBB
  
Join Date: Jul 2016
Posts: 12
Quote:
Originally Posted by Wet Flame View Post
This question might have been ask before!

XT600-e 1998 59 000K
Had if for 7 months and great bike I love it
So far I change the spark plug 7000k ago did oil service twice and last one was 1000k ago and air filter was 7000k ago.. I just removed it because I'm getting a new one next week and notice there was oil on/in it and also in the air filter chamber... can it be a real problem or it can be expected from a old XT with 59K
Now the problem is :
When going faster then 100km/h at around 110-120 the bike starts loosing power and kind of chocking on itself like if there was not enough fuel.. if I squeeze the accelerater completely it will keep doing this and slow down to anything between 80-100, if I just let the accelerater go back just a bit it goes back to normal and I can keep riding at 100-105 quite fine but if I snap it all the way the problem persists.

I have no problem from 0 to 100 and the acceleration is quite good but over 100 I just don't get it.. I'm struggling to pass a car or going up big hills at high speed on the highway.

I am learning about bikes everyday so please be patient with me hehe.

I hope I was clear enough in my description..
Cheers!
check secondary carburetor membrane and fuel filter
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
83-86 TT600 vs 84-89 XT600 Cams Cylinders Carbs manco Yamaha Tech 33 4 Dec 2013 12:24
XT600 running issues ajax Yamaha Tech 17 21 Nov 2013 05:12
XL125 Weak acceleration / power loss after visit to the mechanic Ndoro Honda Tech 13 22 May 2013 12:56
12v power outlet installation baz870 Tech 20 14 Feb 2013 06:29
GS 12v Power Outlet Solution.. Wile E Coyote Communications 0 28 Nov 2011 08:52

 
 

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 08:47.

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