Go Back   Horizons Unlimited - The HUBB > Technical, Bike forums > Yamaha Tech
fuel system help 1990 xt 600 fuel system help 1990 xt 600
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 Andy Miller, UK, Taking a rest, Jokulsarlon, Iceland

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


Photo by Andy Miller, UK,
Taking a rest,
Jokulsarlon, Iceland



Like Tree2Likes

Reply
Page 1 of 3 1 23
 
LinkBack Thread Tools Display Modes
  #1  
Old 3 Aug 2013
Registered Users
Veteran HUBBer
  
Join Date: Mar 2013
Location: nj usa
Posts: 170
fuel system help 1990 xt 600
I have had this bike for about 6 months now. When I bought it needed new intake gaskets and intake itself they had the wrong ones on there don' t ask.I also took the carbs apart and put new o rings needle valve etc. and cleaned the carb out. Now my problem is when I cruise around at 25 35 she gives a little hesitation but she puuls great and rides great at higher spead and cruises great on the highway. Also she starts great at cold and warm but did noiticed that if she is in idle and I give it a quick hit with the throttle she will stall but will start back up help is needed thanks again
Reply With Quote
  #2  
Old 3 Aug 2013
Registered Users
Veteran HUBBer
  
Join Date: Sep 2012
Location: Middle USA
Posts: 349
Have you adjusted the fuel screw at the front bottom of the primary carb?
Reply With Quote
  #3  
Old 3 Aug 2013
Registered Users
Veteran HUBBer
  
Join Date: Mar 2013
Location: nj usa
Posts: 170
Yes I did which is a pain and burnt fingers too is there a easier way with a tool
Reply With Quote
  #4  
Old 3 Aug 2013
Registered Users
Veteran HUBBer
  
Join Date: Sep 2012
Location: Middle USA
Posts: 349
Just a short screwdriver....
Reply With Quote
  #5  
Old 3 Aug 2013
Registered Users
Veteran HUBBer
  
Join Date: Mar 2013
Location: nj usa
Posts: 170
Which way do you suggest to go in or out thanks
Reply With Quote
  #6  
Old 4 Aug 2013
xtrock's Avatar
Registered Users
Veteran HUBBer
  
Join Date: May 2013
Location: Norway
Posts: 1,368
First all the way inn, then 2,5 rounds out.
Reply With Quote
  #7  
Old 4 Aug 2013
bacardi23's Avatar
Registered Users
Veteran HUBBer
  
Join Date: Sep 2007
Location: XXX<-Portugal->Azores->Santa Maria (island)
Posts: 1,544
count the turns you go in! and don't tighten it or you'll break it!!
Reply With Quote
  #8  
Old 4 Aug 2013
Registered Users
Veteran HUBBer
  
Join Date: May 2013
Location: Wisconsin, USA
Posts: 827
Often a stutter when giving throttle is the needle circuit. The slide opens up but gas takes a second to catch up. I'd raise the needle one clip after verifying mixture setting. Borderline lean pilot jet will make it worse.
Reply With Quote
  #9  
Old 4 Aug 2013
Registered Users
Veteran HUBBer
  
Join Date: Mar 2013
Location: nj usa
Posts: 170
I did purchase new jets and did put everything stock and did turn the screw 2.5 turns out . I will try to adjust needle up one also what should I use to raise the needle thanks.
Reply With Quote
  #10  
Old 4 Aug 2013
Registered Users
Veteran HUBBer
  
Join Date: May 2013
Location: Wisconsin, USA
Posts: 827
If your needle has multiple groove you move the clip down one groove, if ther is no grooves like mine I had some thin washers that I put underneath the clip when in the holder. Only needs to be .015"-.025" thick.
Reply With Quote
  #11  
Old 6 Aug 2013
Registered Users
Veteran HUBBer
  
Join Date: Mar 2013
Location: nj usa
Posts: 170
Would it be easier to take carb off or can I leave the carb ? Also when cold start she takes time to warm with the choke on only. After warmnup she runs good even when after running and sitting for about 1hr and hot outside I have to choke then ride push choke in goodvto go maybe same problem thanks again
Reply With Quote
  #12  
Old 6 Aug 2013
Registered Users
Veteran HUBBer
  
Join Date: May 2013
Location: Wisconsin, USA
Posts: 827
Sounds good. It should need choke to start and warm up for a minute or two. Much more than that it may be a sign of running lean. Did you take the spark plug out? What color was it. To check the needle you may be able to leave the carbs on the bike. Just take the tank off and most bolts should be right there, I used a 90 degree screwdriver for some of mine on the secondary.
Reply With Quote
  #13  
Old 6 Aug 2013
Registered Users
Veteran HUBBer
  
Join Date: Mar 2013
Location: nj usa
Posts: 170
maybe I will raise the needle and leave the air mixture alone cause that might richin it up allitle. For the plug drive it then check correct? Thanks
Reply With Quote
  #14  
Old 6 Aug 2013
Registered Users
Veteran HUBBer
  
Join Date: May 2013
Location: Wisconsin, USA
Posts: 827
For best results go for a drive and hold the throttle steady at the rpm range you want to check.(18k to2000rpm,then 2500rpm, then 3000,even 3500rpm) Drive for 2,3, even 4 miles/km like that, then quickly pull in the clutch and shut the motor down(before even stopping if possible). Pull the plug and look at the color.

It should be a light grayish or light tan color. If white or real light colored it's lean, dark brown or black= rich. You can do that at several rpms to get a decent idea of what's going on. It is also best to start with a new plug or one that is cleaned. An old tarnished plug may not be as accurate.

This isn't a do-all /end-all way to know just what is going on but it is pretty good for getting close
Reply With Quote
  #15  
Old 6 Aug 2013
Registered Users
Veteran HUBBer
  
Join Date: Sep 2012
Location: Middle USA
Posts: 349
Actually this is a very GOOD way to check your mixture. It is called a plug chop and your spark plug never lies. Use a fresh plug so you can read the color correctly. Only better way is to use an o2 sensor or EGT (exhaust gas temp) gauge but either is expensive so the old plug chop is your friend. Just buy several new plugs to throughly test thru the ranges.
Reply With Quote
Reply
Page 1 of 3 1 23

« 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
Tales from the Saddle klous-1 Ride Tales 88 4 Feb 2016 21:30
hesitation 1990 xt 600 njenduro Yamaha Tech 5 1 Jun 2013 06:16
Bolivia - RHD ? fuel ?? security !!!‏ Phil Flanagan 4 wheel Overland Travel 2 7 Dec 2012 19:01
Bolivia - RHD ? fuel ?? security !!!‏ Phil Flanagan South America 1 7 Dec 2012 17:05
1990 XT 600 Kickstarter zcarter Yamaha Tech 5 23 Mar 2012 21:52

 
 

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

ALL Dates subject to change.

2025 Confirmed Events:

  • Virginia: April 24-27 2025
  • Queensland is back! May 2-4 2025
  • Germany Summer: May 29-June 1 2025
  • CanWest: July 10-13 2025
  • Switzerland: Date TBC
  • Ecuador: Date TBC
  • Romania: Date TBC
  • Austria: Sept. 11-14
  • California: September 18-21
  • France: September 19-21 2025
  • Germany Autumn: Oct 30-Nov 2 2025

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 05:14.

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