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.
Photo by Daniel Rintz, Himba children, Namibia

The only impossible journey
is the one
you never begin

Photo by Daniel Rintz,
Himba children, Namibia



Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 29 Jun 2010
Registered Users
Veteran HUBBer
 
Join Date: Jun 2010
Location: New Port Richey FL
Posts: 162
84 XT600 poor fuel mileage. (now with pictures) 56k=death

this one is new to me.

my 84 XT seems to suck down about a gallon of gas in 20 miles, gentle riding, no hard on the throttle runs or anything, just gentle acceleration.

I know the carb is clean, pretty sure float height is right, only thing I saw is it looks like the secondary carb has had some sort of mod where someone attempted to enlarge the hole a little, and its all kinds of a mess. now I dont THINK this could cause the issue, but I've been surprised before. when I can I'll take a picture of the inside for anyone ineterested.

I'm just looking to know if this fuel mileage is normal or not though. sure doesnt seem it should be.

Last edited by bobthebiker; 1 Jul 2010 at 04:20.
Reply With Quote
  #2  
Old 29 Jun 2010
Registered Users
HUBB regular
 
Join Date: Nov 2007
Location: Lancashire
Posts: 72
20 mpg that's unreal!
Mine's a 85 bike,I reckon it does about 60mpg.
What colour's the plug? Have you got a fuel leak?!
Mark
Reply With Quote
  #3  
Old 29 Jun 2010
Registered Users
New on the HUBB
 
Join Date: Jun 2010
Location: London
Posts: 7
Thats 3.0L 4x4 mpg

You need to pull the carbs and 'reset' everything back to standard. The only way i can see the mpg going on is that the fuel/air mix is shot and/or both carbs are working all the time at the same time.

Can you smell fuel when its running ? is it 'pulling' through the revs ok or is it spluttering or backing off?

Pictures would be nice.

on the other hand, do you have a locking petrol cap? are there teens with scooters living near you hahahah

Tom
Reply With Quote
  #4  
Old 29 Jun 2010
Registered Users
Veteran HUBBer
 
Join Date: Jun 2010
Location: New Port Richey FL
Posts: 162
I'm pretty confident fuel theft isnt an issue, as I rode i 20 miles and burned a gallon roughly.


Soon as I have an opportunity, I"m going to reset the carbs, but I'm not sure exactl what must be done.

plug looks SLIGHTLY rich but not excessively. while riding, theres a slight surge at 3000-3500 rpm. Generally though I can twist the throttle and this thing will either lift the front end, or leave a trench behind me, or both with no hassles.

Is there a way to know if both carbs are working full time?
Reply With Quote
  #5  
Old 29 Jun 2010
Registered Users
New on the HUBB
 
Join Date: Jun 2010
Location: London
Posts: 7
Ok

The first carb with the slide is there for low end running. the second card is of the CV Vacuum type. This CV carb comes into opperation when there is a high demand from the engine.

This will happen approx around 4-5000 rpm.

Seeing as the plugs are a little dark and its gulping fuel, i think i would still look at both carbs working 'all' the time rather than slide carb first then the cv.

A thing I sometimes do, the older the bike the more i do it, is run the bike then tap the carb bowls and see if the engine note changes, misfires, or revs. then take it upto 3000rpm and try again. it may give you an indication that things may be stuck/worn.

However either way, your going to have to pull them in the end.

There are pdf files of the xt all over the web so you should be able to get one for the carbs.

Good luck and get back when you have more info, photos or carbs out.

I have a pair in a box i think, will go have a look over them and see if i can give any pointers.

Do you have a fuel pump on your xt?

Tom
Reply With Quote
  #6  
Old 29 Jun 2010
Registered Users
Veteran HUBBer
 
Join Date: Jun 2010
Location: New Port Richey FL
Posts: 162
No fuel pump on my bike. the CV carb though, I have to get a pictue, bt the pressed in jet, looks like someone did make an attempt to enlarge it for some unknown reason. I'm probably gonna need a whole new CV carb honestly, but I'm not certain yet.

I've been through the carbs before, and not noticed anything dirty, or out of place/spec, but at the time, I hadnt looked at float height, as I have no tool to measure that.
Reply With Quote
  #7  
Old 1 Jul 2010
Registered Users
Veteran HUBBer
 
Join Date: Jun 2010
Location: New Port Richey FL
Posts: 162
ok, I pulled the carbs off, the jet on the right side sure does look like some less than smart hick decided to "rejet" the thing his way.

Does anyone have another one of these jets I could snag up for cheap? it sure looks like this one is FUBAR.



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
XR650L fuel mileage XR650L - Winbob Honda Tech 15 28 Aug 2015 10:43
drz 400 on poor fuel? kiwiron Suzuki Tech 2 23 Dec 2007 08:41
Running 640 on poor fuel lukecapetown KTM Tech 8 27 Nov 2007 10:13
Poor fuel and DR-Z400s? Viktor @ OZ Which Bike? 3 25 Aug 2002 18:19
what to do with poor fuel quality ??? vincent danna Equipping the Bike - what's the best gear? 6 27 Mar 2002 23:03

 
 

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!

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 13:41.