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 17 Jun 2013
G600's Avatar
Registered Users
Veteran HUBBer
 
Join Date: May 2009
Posts: 227
Engine difference – 3TB vs 4PT (missing 5 HP)

The 3TB model is supposed to be 33KW, but the newer 4PT is 29,4KW. Has it really 3,6KW less or is Yamaha just using different numbers for some reason? Anyone know??

FYI:
I have the 4PT model. For testing purposes I did take out the airbox snorkel and the muffler tip (I would not run the bike like that though, too noisy) .

Now the bike was more noisy but to my surprise I could not feel any power difference. The bike did not feel lean. Most bikes with heavily restricted intake/exhaust respond quite a lot to even modest “decorking”.
__________________
----------
Yamaha XT600E '01, Honda XR400 '03, Yamaha XT550 '83

Last edited by G600; 9 Sep 2013 at 00:30.
Reply With Quote
  #2  
Old 17 Jun 2013
Registered Users
Veteran HUBBer
 
Join Date: May 2013
Location: Norway
Posts: 455
Yes its correct the new model has less bhp.
Reply With Quote
  #3  
Old 17 Jun 2013
G600's Avatar
Registered Users
Veteran HUBBer
 
Join Date: May 2009
Posts: 227
Quote:
Originally Posted by xtrock View Post
Yes its correct the new model has less bhp.
Ok, thanks. Do you know why?

I'm wondering if the 4PT can be upgraded to 3TB specs by swapping out parts.. The basic engine is more or less the same except for the clutch I am told.
__________________
----------
Yamaha XT600E '01, Honda XR400 '03, Yamaha XT550 '83
Reply With Quote
  #4  
Old 17 Jun 2013
Registered Users
Veteran HUBBer
 
Join Date: May 2013
Location: Norway
Posts: 455
Carb, exhaust making the difference? just my guess.
Reply With Quote
  #5  
Old 18 Jun 2013
Registered Users
Veteran HUBBer
 
Join Date: May 2013
Location: Wisconsin, USA
Posts: 331
Check the intake boot inside diameter, the one that bolts to the motor. It is supposed to be smaller dia, so an old version will help.
Reply With Quote
  #6  
Old 21 Jun 2013
G600's Avatar
Registered Users
Veteran HUBBer
 
Join Date: May 2009
Posts: 227
Thanks guys.

I did compare part numbers (intake boots) and they seem to be the same. Maybe I will take it apart anyway, and take a look.
__________________
----------
Yamaha XT600E '01, Honda XR400 '03, Yamaha XT550 '83
Reply With Quote
  #7  
Old 21 Jun 2013
Registered Users
Veteran HUBBer
 
Join Date: Mar 2010
Location: Granada-Spain
Posts: 239
My last XT has a 4PT engine and a ´95 TT600S carb and everybody said that XT runs so well
Reply With Quote
  #8  
Old 9 Sep 2013
G600's Avatar
Registered Users
Veteran HUBBer
 
Join Date: May 2009
Posts: 227
I may be on to something. Apparently the XT lost the 5 hp in 1996, went from 45 hp down to 40 hp. That year they changed the camshaft.
1996 on camshaft: 1jk-12170-00
1986-2005 camshaft: 1JK-12171-00-00


I already have tried opening up the intake/exhaust with no noticeable change in power. Jens Eskilden has done lots of modifications to his bike without any big change in power.

A bike that is heavily restricted on the intake and exhaust should respond more to uncorking, so the bottleneck must be somewhere else.


1. First the basic question, has anyone compared the pre- and post 1995 XT600E? Is the power difference real?
2. Does anyone have access to pre and post XT600E/XT600 camshafts? Is there a difference in lift or grind?
__________________
----------
Yamaha XT600E '01, Honda XR400 '03, Yamaha XT550 '83
Reply With Quote
  #9  
Old 9 Sep 2013
Registered Users
Veteran HUBBer
 
Join Date: Feb 2010
Location: Border Ranges Northern NSW, Australia
Posts: 756
The extra "00" is not a different number, they added two extra digits like they add a few more numbers in a telephone number to allow for more part numbers.

If it ends with "00" its zero,,,its the same number, but if you see say "01" it could be a superseded number or more commonly a color difference.

Mezo.
__________________
http://www.tenere.co.uk/
Reply With Quote
  #10  
Old 9 Sep 2013
G600's Avatar
Registered Users
Veteran HUBBer
 
Join Date: May 2009
Posts: 227
Quote:
Originally Posted by Mezo View Post
The extra "00" is not a different number, they added two extra digits like they add a few more numbers in a telephone number to allow for more part numbers.

If it ends with "00" its zero,,,its the same number, but if you see say "01" it could be a superseded number or more commonly a color difference.

Mezo.
Thanks Mezo great info. The numbers are not the same though, if you take a closer look. Unless I am misunderstanding something

1996 on camshaft: 1jk-12170-00
1986-2005 camshaft: 1JK-12171-00-00
__________________
----------
Yamaha XT600E '01, Honda XR400 '03, Yamaha XT550 '83
Reply With Quote
  #11  
Old 9 Sep 2013
Registered Users
HUBB regular
 
Join Date: Jun 2012
Location: UK
Posts: 59
(You're not misunderstanding anything).

Sounds like you -are- onto something, G600 - it could well be a differently-profiled cam.

It may be that Yamaha tried to flatten the torque curve a bit, to make the torque even more usable, in which case the slightly-softened BHP would actually be a good thing (unless you have a racing XT!)... But then again, the cynic in me wonders whether it was more to do with reducing noise and keeping emissions in check . Maybe it was to address both angles.


Quote:
Originally Posted by G600 View Post
Thanks Mezo great info. The numbers are not the same though, if you take a closer look. Unless I am misunderstanding something

1996 on camshaft: 1jk-12170-00
1986-2005 camshaft: 1JK-12171-00-00
Reply With Quote
  #12  
Old 9 Sep 2013
Registered Users
Veteran HUBBer
 
Join Date: Feb 2010
Location: Border Ranges Northern NSW, Australia
Posts: 756


Sorry i didn't spot that, my eyes are getting so bad now i really do need glasses, serious.

But for reference what i was saying about the "00" stands, if your looking through old part fiches they don't have the addition.

If you enter the original OEM part number in Google (like i do) then look for CMS website entry it will show you if that part is a superseded part number (and it is) meaning it is 100% the same part.

Click on this part number & read,,, 1JK-12170-00

Mezo.
__________________
http://www.tenere.co.uk/
Reply With Quote
  #13  
Old 10 Sep 2013
G600's Avatar
Registered Users
Veteran HUBBer
 
Join Date: May 2009
Posts: 227
Quote:
Originally Posted by Mezo View Post


Sorry i didn't spot that, my eyes are getting so bad now i really do need glasses, serious.

But for reference what i was saying about the "00" stands, if your looking through old part fiches they don't have the addition.

If you enter the original OEM part number in Google (like i do) then look for CMS website entry it will show you if that part is a superseded part number (and it is) meaning it is 100% the same part.

Click on this part number & read,,, 1JK-12170-00

Mezo.

Thanks Mezo. So this is not it.

Back to basics. Has anyone ridden the older and newer (pre-and post 1996) XT600E back to back? Are the older bikes more powerful?
__________________
----------
Yamaha XT600E '01, Honda XR400 '03, Yamaha XT550 '83
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
1VJ and 3TB front fork mix? svakak Yamaha Tech 0 4 Feb 2013 18:07
Engine numbers on bike titles? srileo Trip Paperwork 4 21 Aug 2012 21:18
3TB - 4PT Cases w00d Yamaha Tech 15 13 Feb 2012 20:59
XT600E 2002 Engine Oil Trichelia Yamaha Tech 17 17 Nov 2011 14:25

 
 
 

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 13:59.