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 11 Jun 2010
Registered Users
Veteran HUBBer
 
Join Date: Feb 2010
Location: Devon UK
Posts: 123
Tune up

I am looking to increase performance mainly in lower end grunt and acceleration, so which piston and head should I be looking at?
I am not bothered about top end.

I see Kedo sell a 98mm 10:1 635cc or 101mm 10.75:1 675cc, both 141Euros.

I would take it to a specialist to do the work and maybe get them to gas flow the head and fit a new camshaft.
Reply With Quote
  #2  
Old 11 Jun 2010
bacardi23's Avatar
Registered Users
Veteran HUBBer
 
Join Date: Sep 2007
Location: XXX<-Portugal->Azores->Santa Maria (island)
Posts: 1,524
Personally, I'd go with a "Wiseco" or "JE performance" piston a +1mm with 12.1 :1 compression and a stage-1 camshaft(cost around 220euros + shipping), opened up airbox with hi flow air filter, kedo downpipes, a good muffler, hi-speed inlet ports(reduce inlet ports at least 20%) and jetting everything accordingly!

That's just about the best performance gains you can get out of the XT's engine without sacrificing much reliability and not getting you broke!


Vando
Reply With Quote
  #3  
Old 11 Jun 2010
bacardi23's Avatar
Registered Users
Veteran HUBBer
 
Join Date: Sep 2007
Location: XXX<-Portugal->Azores->Santa Maria (island)
Posts: 1,524
If you want a little more poneys out of the engine you'll have to do some extra work and spend quite bigger amount of money...

A forged clutch basket with a good clutch disc kit with HD clutch prings which is lighter and gives better performance and cooling. (these baskets normally have alot more holes for the oil to go through!)
A lighter flywheel rotor.

Have you ever serviced the engine before? replaced piston or valves or clutch or whatever?

If you have, I'd recommend a complete engine flush and cleanup!
Why? because most of the performance lost in an engine is due to friction!
friction caused by using dirty tools, dirty hands, uncleaned parts, mixture of old oils etc etc etc....

Also, one of the parts you should have EXTREME CAREFULL when replacing parts is where the camshaft slides in the top of the cylinder head!
Any touching with tools there and it'll make scratches even blemishes are a problem for friction and dirty tools is def a no no!

Have fun!
Reply With Quote
  #4  
Old 11 Jun 2010
Registered Users
Veteran HUBBer
 
Join Date: Feb 2010
Location: Devon UK
Posts: 123
Yes I have already got the devil big bore headers, silencer, piperx air filter, snorkel out, iridium plug.

So for low end grunt and acceleration you would suggest a piston +1mm with 12.1 :1 compression (rather than the 2 I mentioned?) and a stage-1 camshaft.

Would that be from Kedo? I got their new 2010/11 catalogue through this morning.

I have only ever changed the oil, oil filter, plug, air filter, never touched the piston, valves or clutch.
Reply With Quote
  #5  
Old 11 Jun 2010
bacardi23's Avatar
Registered Users
Veteran HUBBer
 
Join Date: Sep 2007
Location: XXX<-Portugal->Azores->Santa Maria (island)
Posts: 1,524
Hi! well.. stage-1 camshaft supossebly offers better low/midrange...

For low end power I suggest you also change your sprocket combo!
I may offer to suggest 14/47 for more power and so you don't loose too much top speed as well...

As for the pistons.. I suggest you don't go directly to the 101mm upgrade...
Yes, it should give you some very nice power but I don't think the crankshaft would hold up too long with that PLUS, any cylinder damage and you'd have to either get a new cylinder sleeve or even a new cylinder!

I haven't seen the KEDO piston kits but I'd personally go with a Wiseco or a JE performance piston.... JE pistons are widely used on NASCAR cars so I believe they are of really good quality and very much comparable to Wiseco!


I do suggest you one little thing... a magnetic oil screw!
A Hi flow oil filter could also be a good thing...

Vando
Reply With Quote
  #6  
Old 11 Jun 2010
bacardi23's Avatar
Registered Users
Veteran HUBBer
 
Join Date: Sep 2007
Location: XXX<-Portugal->Azores->Santa Maria (island)
Posts: 1,524
check this link for the camshafts:


[url=http://www.je-kolben.de/index2.php?view=nocken&HID=28&lan=en]Gro

just delete the "[url=" and the "]Gro" parts..... HUBB IS GETTING CRAZY lol
Reply With Quote
  #7  
Old 11 Jun 2010
Registered Users
Veteran HUBBer
 
Join Date: Feb 2010
Location: Devon UK
Posts: 123
I originally changed the sprockets to 14/47 but then bought a blue annodised 54 tooth rear sprocket so have 15/54 and love it.
I spend all my time on twisty lanes so 60mph is plenty top end for me, I just love bottom end power.

I already installed a magnectic oil plug and hi flo filter.

Thanks for the link to the camshafts, however the page "Yamaha XT 600 built 1983-2004" wont load for me in English, It will load in German so have translated it.

How does this sound for me?

"Big bore - Stage 1 tuning kit The camshafts reprofiled and surface treatment. The camshaft sent must not be broken! Choice of Camshaft - Profile level 1 or 2! The cylinder is drilled at 97 mm, chamfered and honed. CP - Forged piston kit in a class of 97.00 mm, + 2 mm oversize, compression 10.5: 1 The pistons are supplied with matching piston rings, pins and clips The cylinder head is performance-revised. The valve seats are milled streamlined and performance-optimized channels. Including combustion chamber and glass bead channels. Also contains the Topend Seal for the model years 1988 to 1996. Please give us the Year."

Could you please tell me the difference between a stage 1 and 2 and race cam?
Reply With Quote
  #8  
Old 11 Jun 2010
bacardi23's Avatar
Registered Users
Veteran HUBBer
 
Join Date: Sep 2007
Location: XXX<-Portugal->Azores->Santa Maria (island)
Posts: 1,524
Hi...go to: [url=http://www.je-kolben.de]Gro
Reply With Quote
  #9  
Old 11 Jun 2010
Registered Users
Veteran HUBBer
 
Join Date: Dec 2008
Location: Denmark
Posts: 1,070
Kedo offers different cams, depending on if you want low, mid og high range performance.

When you do all this, remember this:

Its til a xt. Its still real heavy, designed in the 1980's with bad suspention and stuff like that. The reasonable thing would be to sell the bike, and buy another more suited for you're needs. Project bikes are fun, put awfully expensive.

You could gain a lot of "seat of the pants horsepower/torque" just by riding a bike with same performance, and 30kg lighter.

If yoiu do al this nice stuff to you're bike, remember the suspension.... The brakes arent all that bad imo. They're not exactly race ready, but adequate imo.
Reply With Quote
  #10  
Old 11 Jun 2010
Registered Users
Veteran HUBBer
 
Join Date: Feb 2010
Location: Devon UK
Posts: 123
You are right Jens, it will always be an XT.

I was looking at XR650's which are abour 50lbs lighter I beleive but decided to stay with the XT and spend a few hundred euros to get that extra horsepower.

Yes the brakes are pretty good, actually the front brake is very good, I am upgrading the brake lines too with braided stainless steel ones.

I love the XT and the blue colour,(get quite a few comments on the colour), also have blue riding gear.
I do not want top end just more low/mid end power, obviously I don't want to overdo it and have to strip down the engine every weekend but just improve things a few HP.
It was 33 BHP at the rear wheel before I fitted the current silencer, Ideally I would like 40-45 which I think the XR has at the rear wheel (61 camshaft)from looking at some old dynos.
Reply With Quote
  #11  
Old 11 Jun 2010
Tenere Tom's Avatar
Registered Users
Veteran HUBBer
 
Join Date: Aug 2007
Location: Leeds UK
Posts: 420
From experience more cc=more power but when you run out of cc and still want more power then you have to start making things run better and more efficient , this is usually carburation and/or tuning the engine.

It's just a matter of getting more fuel/air into your cylinder and getting it to burn at it's best.

A ported head and a good carb setup will work wonders, it takes time to get it right but the results can be very rewarding.
__________________
Tom
XJ600 Diversion
Reply With Quote
  #12  
Old 12 Jun 2010
Registered Users
Veteran HUBBer
 
Join Date: Feb 2010
Location: Devon UK
Posts: 123
I think a bigger piston, getting the cylinder head rebored and a 660 from Kolben might be what I need then. Also a camshaft.

Tom would the ported head you have be suitable for after I have had the head rebored or only for what I have on the bike now?
Reply With Quote
  #13  
Old 12 Jun 2010
Tenere Tom's Avatar
Registered Users
Veteran HUBBer
 
Join Date: Aug 2007
Location: Leeds UK
Posts: 420
It would suit either. The size of the piston won't affect it.
Obviously a bigger piston is going to offer more power.
__________________
Tom
XJ600 Diversion
Reply With Quote
  #14  
Old 14 Jun 2010
Registered Users
Veteran HUBBer
 
Join Date: Feb 2010
Location: Devon UK
Posts: 123
Is there room to get the cylinder bored out to 101mm for + 6mm piston? Or would I need to get a sleeve?

Forget that wiseco tell me there is no 101 mm big bore kit for the XT600 after 1996, a few retailers told me the same.

Last edited by 03XT600E; 15 Jun 2010 at 14:20.
Reply With Quote
  #15  
Old 15 Jun 2010
Registered Users
Veteran HUBBer
 
Join Date: Dec 2008
Location: Denmark
Posts: 1,070
You need a new sleeve for anything much over 1-2mm.

Kedo has a 671ccm (ish) bigborekit, its 101mm and with compression around 10-11 as I recall. It should fit al xt600e and probably more.
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
XT 600e tune up? banditderek Yamaha Tech 42 29 Mar 2010 18:25
>URGENT< petrol LR tune Renato Braz 4WD Overland Tech 4 12 Nov 2006 05:27

 
 
 

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.



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

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 07:09.