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 Erling Foshaugen, Curious kid in the Omo Valley, Ethiopia

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


Photo by Erling Foshaugen,
Curious kid in the Omo Valley, Ethiopia



Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 4 Jul 2013
Registered Users
Veteran HUBBer
 
Join Date: Mar 2013
Location: cajah's Mountain N.C.
Posts: 124
Has anyone put in a 11.5:1 piston?

If any one has done the high compression up grade , how does it work. Stock cam or after market. How about heat issues? I would like to put one in but would like to know about pros and cons from someone who has done it. thumpthump
Reply With Quote
  #2  
Old 4 Jul 2013
xtrock's Avatar
Registered Users
Veteran HUBBer
 
Join Date: May 2013
Location: Norway
Posts: 1,370
I have a kit piston( wiseco), cam upgrade, springs upgrade. I havent used it because its better to have engine for more years than have a little more power for a few years. It works fine but offcourse it do more wear on the rest of the engine parts. If you have done upgrade with new exhaust all the way, KN filter and bigger jets you dont need more power and if you do buy a KTM with 75bhp.
Reply With Quote
  #3  
Old 4 Jul 2013
Registered Users
Veteran HUBBer
 
Join Date: Mar 2013
Location: cajah's Mountain N.C.
Posts: 124
I have a 86 and a 90 with a spare engine. I have gone to air pods , rejetted and raised the needles on both with after market exhausts. The 86 is set up for serious offroad and has more than enough power. However I have the 90 set up more for street and fire roads. I want more power on the 90. I was hoping to put a 11.5:1 piston and use the stock cam or maybe a stage one. I am a little concerned about heat. I was wondering about what kind of power improvement I could expect for my efforts. As for as a KTM too much money and besides Its more fun to beat the new bikes with my old 27 year old xt. thumpthump.
Reply With Quote
  #4  
Old 4 Jul 2013
xtrock's Avatar
Registered Users
Veteran HUBBer
 
Join Date: May 2013
Location: Norway
Posts: 1,370
Hehe your not going to beat any KTM 75bhp with changing piston, what you get is alot more torque and more wheelies.
Reply With Quote
  #5  
Old 4 Jul 2013
Registered Users
Veteran HUBBer
 
Join Date: Mar 2013
Location: cajah's Mountain N.C.
Posts: 124
Hard to use 75 hp in the North Carolina mountain trails. Mostly tight twists and few streights , a cliff on one side with bears at the bottom. But torque and wheelies sounds good. thumpthump
Reply With Quote
  #6  
Old 6 Jul 2013
Registered Users
Veteran HUBBer
 
Join Date: Mar 2013
Location: cajah's Mountain N.C.
Posts: 124
Really? No one has put the 11.5:1 piston in their xt? OK , does anyone know someone who has that can comment? thumpthump
Reply With Quote
  #7  
Old 6 Jul 2013
Registered Users
Veteran HUBBer
 
Join Date: Feb 2005
Location: uk
Posts: 217
hi try these

hi you could ask on xt600.de or you could contact kedo.de who sell
Item 31220: WISECO 11.5:1 Piston Kit, Complete, 95.00mm
hope this helps steve
Reply With Quote
  #8  
Old 6 Jul 2013
Registered Users
Veteran HUBBer
 
Join Date: Mar 2013
Location: cajah's Mountain N.C.
Posts: 124
Thanks , But I can not read German and the computer says it translates but will not on the forum. I was looking for final user opinions not biased seller comments. Thumpthump.
Reply With Quote
  #9  
Old 6 Jul 2013
Registered Users
Veteran HUBBer
 
Join Date: Dec 2008
Location: Denmark
Posts: 1,417
Cant see why you should have a problem.

Theres an xt600 facebook group (its called "Yamaha XT-600"), a lot of guys inthere have have high comp pistons.
Reply With Quote
  #10  
Old 7 Jul 2013
Registered Users
Veteran HUBBer
 
Join Date: Mar 2013
Location: cajah's Mountain N.C.
Posts: 124
Thanks, Ill check it out. thumpthump
Reply With Quote
  #11  
Old 7 Jul 2013
Registered Users
Veteran HUBBer
 
Join Date: May 2013
Location: Wisconsin, USA
Posts: 827
All the motors I've seen that someone put a high comp kit in(not XT's) have been pretty happy with them, some have had heat issues( an added oil cooler will be helpful), several didn't last as long as the stock setup, BUT, with that extra power they also beat the motor pretty hard so that's a consideration. Mostly as long as you take care of it, don't run it at 7000rpm "because it sounds cool", and be vigilant with maintenance, it should work out good. I personally would go with something like 10:1 or maybe 10.5:1 and not have to worry about fuel quality/octane as much and make up for it by a good port job and valves. To get the most out of the piston a better set of carbs (CR33's work good I here) will be in order.
Reply With Quote
  #12  
Old 7 Jul 2013
xtrock's Avatar
Registered Users
Veteran HUBBer
 
Join Date: May 2013
Location: Norway
Posts: 1,370
XT600 DUAL CR33 Carburetor Kit - Yamaha Dual-Sport - ThumperTalk

http://www.brspecialtuning.co.uk/keihin.htm

http://www.motorcycle-exhausts.co.uk...uct--4280.html

http://www.motorcycle-exhausts.co.uk...ct--15507.html

You really need to dig down in your wallet to buy these..

I have this one on my bike and it works great: http://www.motorcycle-exhausts.co.uk...uct--3595.html
Reply With Quote
  #13  
Old 7 Jul 2013
Registered Users
Veteran HUBBer
 
Join Date: Mar 2013
Location: cajah's Mountain N.C.
Posts: 124
Thanks xtrock. I would rather go with less compression also. However the only way I have found to go 10:1 is to over bore to 98 from 95. This leaves me with no where to go without boring the cases in the future. Also, when I went to 96 overbore I had more vibration and a 98 would be worse. I have not seen any other compression options except 11.5:1 available in the US. If I can find a 88 and up jug for cheep I may go the 10:1. Yea, those carbs are nice but cost more than I paid for either xt I have. What do you think of the 250 ninja carb swap? Right now I have A pipe and am running Air pods. It has taken a while but I finally have figured how to jet for those and have got it running strong with no flat spots. What jet sizes do they give you in the jet kit? I am running first gen TT carbs with 130 and 135 mains with the needles all the way up. A super rich midrange is the secret to jetting for air pods. Without that air box I have a top end power surge that never existed stock. thumpthump
Reply With Quote
  #14  
Old 7 Jul 2013
Registered Users
Veteran HUBBer
 
Join Date: May 2013
Location: Wisconsin, USA
Posts: 827
It would be a shame to do but you could machine of some of the dome off the 11.5 piston to drop compression, that's if it has solid material underneath and not forged hollow to reduce weight. I do have a set of BSR33 Mikuni's from an '05 Raptor 660 that bolt right on the motor, needs some airbox to carb fab work. Just waiting for time to do the swap. They are easlily gotten off ebay for $150 to $200. You won't get the big performance gain like with the CR's but should work better than the stock things.
Reply With Quote
  #15  
Old 7 Jul 2013
Contributing Member
Veteran HUBBer
 
Join Date: Jan 2006
Location: Sheffield
Posts: 994
whatever you do with your piston are you going to get the crank rebalanced? I don't have an xt but on other engines I'm familiar with a properly done crank balance allowing higher revs with less vibration is a better performance improvement than more displacement or higher comp. Of course best is all together. Is there an oil pump upgrade for the XT - good for extra heat dispersion and higher pressure in the shell bearings, compensating for some of the extra force put in by any power increase upgrades. Just a thought.
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
What do you put in your cv? Franconian After the big trip 21 23 Feb 2014 22:38
Cry For Help! NX4 Falcon Piston Problems in Colombia 2fortheroad.co.uk South America 3 16 Oct 2013 21:00
which oversize piston, KLR 650... help needed! thecoon Kawasaki Tech 1 20 Mar 2013 10:34
KLE 500 B6 2006 Rear brake piston size incey2000 Kawasaki Tech 0 31 Dec 2011 16:47
oversize piston rings kenymact Yamaha Tech 9 2 Dec 2011 22:50

 
 

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

ALL Dates subject to change.

2025 Confirmed Events:

  • Virginia: April 24-27 2025
  • Queensland is back! May 2-4 2025
  • Germany Summer: May 29-June 1 2025
  • CanWest: July 10-13 2025
  • Switzerland: Date TBC
  • Ecuador: Date TBC
  • Romania: Date TBC
  • Austria: Sept. 11-14
  • California: September 18-21
  • France: September 19-21 2025
  • Germany Autumn: Oct 30-Nov 2 2025

Add yourself to the Updates List for each event!

Questions about an event? Ask here

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...

Adventurous Bikers – We've got all your Hygiene & Protection needs SORTED! Powdered Hair & Body Wash, Moisturising Cream Insect Repellent, and Moisturising Cream Sunscreen SPF50. ESSENTIAL | CONVENIENT | FUNCTIONAL.

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 18:37.