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.

LinkBack Thread Tools Display Modes
Old 19 Jun 2007
Registered Users
New on the HUBB
Join Date: Jun 2007
Posts: 2

First timer here...just got back from 360 mile adventure. Bike ran fine to destination but on return trip the power dropped of substantially and was surging abit. Now after every run oil drips from the drain tube in the air cleaner box. Also, on hot start ups there is a random rattle almost as though there is oil starvation. Bike has 19,000 miles on it. Hoping one of you veteran XT guys could point me in the right direction. Thanks for your time
1990 XT600
Bone stock- removed spark arrestor
Dunlop 606 tires
Reply With Quote
Old 19 Jun 2007
Registered Users
Veteran HUBBer
Join Date: Mar 2007
Location: UK
Posts: 3,397
While you are waiting for the experts on here to reply, you may find this website useful to understand what is going on:-

I am a bit of a neanderthal for bike engines so I am not trying to provide any advice but the experienced guys in here will do!!

I've had a lot of helpful advice from these threads - I guess you will get the same assistance - Good luck,

Reply With Quote
Old 19 Jun 2007
Registered Users
HUBB regular
Join Date: Dec 2006
Location: Brum
Posts: 44
The oil dripping from the air box is a bit of a worry as this can be caused by the presence of a lot of oil mist in the crankcase breather pipe or high pressure in the crankcase. What happens is much more oil than normal gets sent into the air box and then ends up dripping out of the box. Have a look at the air filter and inside the box and see if it has any oil contamination.

If it has and the cause is not because you've seriously overfilled the bike with oil, you may have a more serious problem.

One cause could be a blown head gasket that is allowing combustion gases to blow into the cam-chain tunnel, the other could result from a partial siezure that's allowing gas to now blow past the rings. Both problems mean the gas has to go somewhere, and that means up the crankcase breather pipe into the air box carring oil mist with it. Take the air filter out and start the bike up. If there's a load of mist (looks like blue fog/smoke) coming out of the air box, you've definately got a problem of this sort

Both problems would reduce the power.

Not sure of the cause of your rattling as you don't say wher it's coming from

Check your valve clearances first though just in case you have a tight valve.

Is the bike smoking from the exhaust at all? Try and get mate to follow you and see. Are you having to now top-up the oil frequently ?

Good luck!
Reply With Quote
Old 21 Jun 2007
Registered Users
New on the HUBB
Join Date: Jun 2007
Posts: 2

Thanks for the help guys. Rickg, great info. I thought the same thing and checked the air cleaner first thing and it's dry.Haven't got around to running it without the air box cover yet as you suggested. The rattle I referred to sounded like bearing knock to me but it only happened once while it was hot. Haven't got a feel for the oil consumption yet as I don't have many miles on it since it started misbehaving. I've got to find a manual to get my valve clearance specs. Funny, when started cold it sounds and runs just like it used to. Exhaust note has good "pop" to it. My gut feel is that compression is good but i need to confirm it. I hear guys talk about the cam chain. Does there seem to be an average mileage on these engines when they need replacement?
1990 XT600
Bone stock- removed spark arrestor
Dunlop 606 tires
Reply With Quote

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


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!

Next HU Eventscalendar

See all events


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.

Scottoiler automatic chain oilers. The most important accessory for your next motorcycle adventure!

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


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 03:48.