Go Back   Horizons Unlimited - The HUBB > Technical, Bike forums > Yamaha Tech
1984 XT 600 high rpm "miss" 1984 XT 600 high rpm "miss"
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 Ellen Delis, Lagunas Ojos del Campo, Antofalla, Catamarca

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


Photo by Ellen Delis,
Lagunas Ojos del Campo,
Antofalla, Catamarca



Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 1 Sep 2009
Registered Users
HUBB regular
  
Join Date: May 2009
Posts: 24
1984 XT 600 high rpm "miss"
Hi All,

My 84 Xt 600 misses around 5-6000 RPM. The bike only has 5900 miles and is clean. I purchased a new CDI from Wayne Gum on Ebay. Swapped ignition coil and carb from another 84 Xt 600. Purchased new plug, ignition key switch and on/off switch and battery. Bypassed kick stand switch. Should I swap the stator assembly now?... help!

Thanks, Baron
Reply With Quote
  #2  
Old 1 Sep 2009
Registered Users
Veteran HUBBer
  
Join Date: Oct 2007
Location: London
Posts: 298
Assuming your valve clearances are all set correctly.

I had a similar problem recently - after troubleshooting with electrics, spark, etc. Finally found it was my fuel pump. Not sure if your model also has vacuum pump, but my vacuum hose was kinked, causing 'missing' at higher revs.

It was accompanied by loss of power as well though - so perhaps not exactly your problem?

Easy enough to test your stator and charging system before you make drastic (& costly) changes!!
__________________
Reply With Quote
  #3  
Old 1 Sep 2009
Registered Users
HUBB regular
  
Join Date: Oct 2008
Location: Otley, UK
Posts: 24
I had a similar problem with the SZR660 (an xtz660 in drag) after i kinked the vac hose under the tank. The problem manifests itself as a misfire which goes away at lower revs. It's caused by fuel starvation, casued by the fuel pump not working properly.

A split or poorly attached vac hose would manifest similar symptoms and would probably get progressively worse.
__________________
1979 LeMansII
1981 LeMansII
1981 Monza
1987 XT600 1VJ
1997 SZR660
1995 NTV650

"Why do it? Because we can, and we want to." Guiseppe Benelli
Reply With Quote
  #4  
Old 1 Sep 2009
Registered Users
HUBB regular
  
Join Date: May 2009
Posts: 24
XT 600 miss
Thanks for the suggestions, but mine is a 34L so, no vacuum hoses and fuel pump. I will check the OHMs on my stator assembly before swapping. I wonder if metal flakes/debris could be on the rotor magnets, causing an intermitant spark?
All ideas/thoughts welcome. I want to enjoy this bike while summer days are still here!
Reply With Quote
  #5  
Old 1 Sep 2009
Registered Users
HUBB regular
  
Join Date: Oct 2008
Location: Otley, UK
Posts: 24
It might still be worth checking for fuel starvation at high rpm; if it's a 34L then it's few years old and there could be all sorts of goop floating about in the fuel system. One wonders about float heights and so on too
__________________
1979 LeMansII
1981 LeMansII
1981 Monza
1987 XT600 1VJ
1997 SZR660
1995 NTV650

"Why do it? Because we can, and we want to." Guiseppe Benelli
Reply With Quote
  #6  
Old 1 Sep 2009
Registered Users
Veteran HUBBer
  
Join Date: Dec 2008
Location: Denmark
Posts: 1,417
What are you doing to that pooor bike, riding at thoose rpms =)

You could check the carb'
Reply With Quote
  #7  
Old 1 Sep 2009
Registered Users
Veteran HUBBer
  
Join Date: Aug 2009
Location: Dorset UK
Posts: 395
Check volt feed to low tension side of coil... make sure theres a good 12volts getting to it.

Tried a new plug - always worth doing & dead cheap
Reply With Quote
  #8  
Old 1 Sep 2009
Registered Users
Veteran HUBBer
  
Join Date: Jan 2001
Location: Stockholm
Posts: 651
other checks
The volts going to the coil are not 12 V - this is CDI ignition, independent of the battery.

The rest of the above suggetions I´d certainly do, but your airfilter could also be a bit clogged. Just remove and try without. Or clean thoroughly.

I would not think of an ignition problem; that would manifest itself at lower revs (second part of advance kicks in before).

So that leaves air intake, carb, exhaust (not clogged?) or spark plug.

Success!
__________________
Auke
http://aukemarieke.blogspot.com
Reply With Quote
  #9  
Old 1 Sep 2009
Registered Users
HUBB regular
  
Join Date: May 2009
Posts: 24
Xt 600 miss
Thanks.... all great suggestions, but all checked out good. I checked the ohms on the stator assembly and pick up coil. Both read WAY below the specifications in my manual. So....., I need to replace the stator assembly. Where do I find one. The dealer wants about $800 for one! The bike isn't worth that much!.... Help!
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
"Algeria-Niger" or "Maro-Maure-Mali-Niger" dloubak Route Planning 4 6 Oct 2009 15:17
Ahem... Aussie Steve Here.. "My Bride to be, '95 KLR650 Needs a California Address" tenere_rider North America 3 8 Apr 2008 05:07
"no objections" letter required from your embassy to ride in India - is that true? karter257 West and South Asia 5 6 Feb 2008 11:02
"Obsessions Die Hard" by Ed Culberson, signed edition Motorycling the Darien Gap! Solo Lobo TRAVEL Equipment for Sale / Wanted 1 13 Jan 2007 16:43
"Two Wheels to Adventure" 1st edition signed First ride from the artic to Argentina! Solo Lobo TRAVEL Equipment for Sale / Wanted 2 13 Jan 2007 16:42

 
 

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 10:46.

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