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.

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 22 May 2007
Registered Users
HUBB regular
 
Join Date: May 2006
Location: Great North
Posts: 20
Irregular idle

Got a -87 XT600 (2KF/NF) which runs strong and smooth most of the time but occasionally I get this idle problem: when the engine is warm the idle sometimes drops from the usual 1300-1500 rpm to 1000 and lower and the engine dies when I try to rev it up. This happens only intermittently. Any ideas who's the culprit?

In the winter I removed, emptied and flushed the tank so there should be no garbage coming from there. The bike is garaged overnight so no water condensation is possible.

If this is some gunk in the carb is there a low tech way of dissolving it with some fuel additive (i.e. avoiding disassembling the carb)? TIA
Reply With Quote
  #2  
Old 22 May 2007
Registered Users
Veteran HUBBer
 
Join Date: Jan 2001
Location: Stockholm
Posts: 651
Rocket science

Instead of the chemical solution, advise the technical approach:

From your symptoms, I think you have either one, or both of the following issues:
- Sticking throttle cables - lubricate and reinstall
- Setting of idle mix incorrect (see earlier posts)

Advise to correct both and then see what happens

Auke
__________________
Auke
http://aukemarieke.blogspot.com
Reply With Quote
  #3  
Old 22 May 2007
*Touring Ted*'s Avatar
Contributing Member
Veteran HUBBer
 
Join Date: Jul 2005
Location: Wirral, England.
Posts: 4,470
There are soo many things that can cause irregular idle.

This only seems to happen when warm which leads me to think that maybe the pilot mixture could be a little rich or the choke isnt closing propery and possibly sticking.

Sure this only happens when warm ?? Does the bike run ok at full throttle ?
__________________
www.TouringTed.com
1994 XR650L
2001 NX650 Dominator.

BMW Dealer Technician
Welder/Fabricator

Ushuaia - Colombia 2007/8
UK- South Africa 2010/11
India 2012
Yukon 2012
S.E Asia 2014
U.K - Magadan 2015
Reply With Quote
  #4  
Old 22 May 2007
tomwest's Avatar
Registered Users
Veteran HUBBer
 
Join Date: Sep 2006
Location: At the moment:Zanzibar
Posts: 117
high revs?

Hi.

Your idel revs are a bit high, my bike idels at 900-1000rpm depending on temperature. have a look at your cabels and choke as mentioned above.
If the bike is running good normaly and just does this once in a while I donĀ“t think the mixture is off.
You might allso want to take a look at the ignition cable, sometimes a change to a new and "fresh" one can do wounders on a old bike.



Tom.
__________________
Places to be and things to do, see you all out there!!

Cheers.

Tom.
Reply With Quote
  #5  
Old 25 May 2007
Registered Users
HUBB regular
 
Join Date: May 2006
Location: Great North
Posts: 20
My Clymer says idle should around 1300 and based on this I raised the rpms a bit - the idle used to be (last riding season when I didn't have this problem) just a tad above 1000 according to bike's tacho.

The gas cables I lubricated some months ago and now checked again. They slide fine.

The bike runs strong at full throttle, no problem there. At cold start full choke brings the rpm's in a minute or two to 3000 and then I take it down. So no cold problem with the choke.

In Clymer they say that gas may go bad during the off-months and recommend some operation to flush the carbs. I'm a bit hesitant to do this not to screw up the set-up. My car which has fuel injection (presumably more sensitive to gas quality) and even after months of unuse never has gas problems. Is this chemical thing real or not?

Thanks guys for ideas. Have to keep checking, ignition cable and else.

-Kari
Reply With Quote
  #6  
Old 26 May 2007
Contributing Member
Veteran HUBBer
 
Join Date: Jan 2004
Location: Powys, Cymru, U.K.
Posts: 105
With the bike running, spray some WD40 or similar on the rubbers between the carbs & cylinder head. If there's no change then all is well there. But more likely, the bike will either stall or rev up due to the rubber separating from the metal on the inlet manifolds. Known fault - get 'em changed.
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
3AJ Oil Pump Idle Gear - Help jrm Yamaha Tech 1 13 Jun 2006 10:34
High Altitude Carb Jetting Franki Suzuki Tech 0 26 Jun 2004 19:42
High Altitude Carb Jetting Franki Honda Tech 0 26 Jun 2004 19:41
XL600LM(pd)-unregular idle speed Bossit Honda Tech 2 6 Sep 2002 22:01
Stalls when you put it in gear at idle 1990XT Yamaha Tech 1 25 Nov 2001 18:05

 
 
 

NEW! HU 2015 Motorcycle Adventure Travel Calendar is now available! Get your copy now for some terrific travel inspiration!

HUGE, 11.5 x 16.5 inches, beautifully printed in Germany on top quality stock! Photos are the winning images from over 600 entries in the 9th Annual HU Photo Contest!

Horizons Unlimited 2015 Motorcycle Adventure Travel Calendar.

"The calendar is magnificent!"

"I just wanted to say how much I'm loving the new, larger calendar!"

We share the profit with the winning photographers. YOU could be in the HU Calendar too - enter here!


HU DVD Autumn Special!

Take 40% off Road Heroes Part 1 until October 31 only!

Road Heroes features tales of adventure, joy and sheer terror by veteran travellers Peter and Kay Forwood (193 countries two-up on a Harley); Dr. Greg Frazier (5 times RTW); Tiffany Coates (RTW solo female); and Rene Cormier (University of Gravel Roads).

The first in an exciting new series, Road Heroes features tales of adventure, joy and sheer terror by veteran travellers."Inspiring and hilarious!"

"I loved watching this DVD!"

"Lots of amazing stories and even more amazing photographs, it's great fun and very inspirational."

"Wonderful entertainment!"

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


Renedian Adventures


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 06:07.