Go Back   Horizons Unlimited - The HUBB > Technical, Bike forums > Yamaha Tech

Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
Contact Overland Solutions for all your custom modifications and setup for overland travel.

Like Tree2Likes

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 3 Aug 2013
Registered Users
HUBB regular
 
Join Date: Mar 2013
Posts: 60
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: 245
Have you adjusted the fuel screw at the front bottom of the primary carb?
Reply With Quote
  #3  
Old 3 Aug 2013
Registered Users
HUBB regular
 
Join Date: Mar 2013
Posts: 60
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: 245
Just a short screwdriver....
Reply With Quote
  #5  
Old 3 Aug 2013
Registered Users
HUBB regular
 
Join Date: Mar 2013
Posts: 60
Which way do you suggest to go in or out thanks
Reply With Quote
  #6  
Old 3 Aug 2013
Registered Users
Veteran HUBBer
 
Join Date: May 2013
Location: Norway
Posts: 399
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: 1,519
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: 305
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
HUBB regular
 
Join Date: Mar 2013
Posts: 60
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: 305
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 5 Aug 2013
Registered Users
HUBB regular
 
Join Date: Mar 2013
Posts: 60
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: 305
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
HUBB regular
 
Join Date: Mar 2013
Posts: 60
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: 305
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: 245
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


Currently Active Users Viewing This Thread: 1 (0 Registered Users and/or Members and 1 guests)
 
Thread Tools
Display Modes

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 81 25 May 2014 11:02
hesitation 1990 xt 600 njenduro Yamaha Tech 5 1 Jun 2013 05:16
Bolivia - RHD ? fuel ?? security !!!‏ Phil Flanagan 4WD Overland TRAVEL 2 7 Dec 2012 18:01
Bolivia - RHD ? fuel ?? security !!!‏ Phil Flanagan South America 1 7 Dec 2012 16:05
1990 XT 600 Kickstarter zcarter Yamaha Tech 5 23 Mar 2012 20:52

 
 


HU DVD Summer Special!

Now that summer is here, get On the Road! Take 30% off the Achievable Dream - On the Road! 2-DVD set until August 31 only. Get On the Road! Learn the tips to staying healthy, happy and secure on your motorcycle adventure!

Our veteran travellers share their tips (and great stories) for staying healthy, happy and secure on your motorcycle adventure.

"A fantastic, informative and inspirational DVD."

"It's brilliant - thank you very much!"

Check it out at the HU Store! Remember to use Coupon Code 'ONTHEROAD' on your order when you checkout.


Renedian Adventures

What others say about HU...

"I just wanted to say thanks for doing this and sharing so much with the rest of us." Dave, USA

"Your website is a mecca of valuable information and the DVD series is informative, entertaining, and inspiring! The new look of the website is very impressive, updated and catchy. Thank you so very much!" Jennifer, Canada

"...Great site. Keep up the good work." Murray and Carmen, Australia

"We just finished a 7 month 22,000+ mile scouting trip from Alaska to the bottom of Chile and I can't tell you how many times we referred to your site for help. From how to adjust your valves, to where to stay in the back country of Peru. Horizons Unlimited was a key player in our success. Motorcycle enthusiasts from around the world are in debt to your services." Alaska Riders

contest pic

10th Annual HU Travellers Photo Contest is on now! This is an opportunity for YOU to show us your best photos and win prizes!

NEW! HU 2014 Adventure Travel T-shirts! are now available in several colors! Be the first kid on your block to have them! New lower prices on synths!

HU 2014 T-shirts now in!

Check out the new Gildan Performance cotton-feel t-shirt - 100% poly, feels like soft cotton!


What turns you on to motorcycle travel?


Global Rescue, WORLDwide evacuation services for EVERYONE

Global Rescue is the premier provider of medical, security and evacuation services worldwide and is the only company that will come to you, wherever you are, and evacuate you to your home hospital of choice. Additionally, Global Rescue places no restrictions on country of citizenship - all nationalities are eligible to sign-up!


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 R80 G/S motorcycle.

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 (22 this year!); 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, the HUBB or to receive the e-zine. 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.


Books & DVDs

amazon

All the best travel books and videos listed and often reviewed on HU's famous Books page. Check it out and get great travel books from all over the world.


Motorcycle Express for shipping and insurance!

Motorcycle Express

MC Air Shipping, (uncrated) USA / Canada / Europe and other areas. Be sure to say "Horizons Unlimited" to get your $25 discount on Shipping!
Insurance - see: For foreigners traveling in US and Canada and for Americans and Canadians traveling in other countries, then mail it to MC Express and get your HU $15 discount!




All times are GMT +1. The time now is 14:24.