Go Back   Horizons Unlimited - The HUBB > Technical, Bike forums > Yamaha Tech
Cylinder bore - recommended engineers? Cylinder bore - recommended engineers?
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 Hendi Kaf, in Cambodia

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


Photo by Hendi Kaf,
in Cambodia



Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 24 Apr 2009
Registered Users
Veteran HUBBer
  
Join Date: Oct 2007
Location: London
Posts: 301
Cylinder bore - recommended engineers?
Was ONLY going to replace a blown head gasket on my LOVELY 1VJ today- planned on having the whole job done during my lunch hour - but on inspection found that cylinder probably needs reboring. (On account of the shiny bits inside being a bit wavey, instead of straight, which probably caused the leak in the first place.)

Q1: Can anyone recommend engineers (is that what they are called?) in or around London or the Southeast?

(No thank you Bolla - not the guys who did your engine please. I really am hoping to have it all back before the end of the year, without having to remortgage )


Q2: ALSO -- if the hole is bigger, does that mean I need bigger rings?

Where do I buy these? What are they called? Will the engineer shop tell me what I need?
__________________

Some great quote about hard core travel that nobody has said yet.[/URL]
Reply With Quote
  #2  
Old 24 Apr 2009
Registered Users
HUBB regular
  
Join Date: Nov 2008
Location: Colorado, US
Posts: 57
You need to find a good machine shop. You may need to bore the cylinder to the next size piston if the scoring is deep or you may only need to hone it if it's not too bad. You still probably should get a new piston and rings and while you're in there replace them.

Don't go to any machine shop you find, look around and ask first. Call local dealers and motorcycle shops and ask them if they can recommend you anybody in the area that knows how to get it done right.
Reply With Quote
  #3  
Old 24 Apr 2009
Big Yellow Tractor's Avatar
Contributing Member
Veteran HUBBer
  
Join Date: Jan 2008
Location: England
Posts: 649
If he's still around, I can recommend Brian Parsons Engineering

Church Crookham, Hampshire

01252 615451

He's done three or four rebores for me over the years and he used to supply piston, ring, gasket kits.
Reply With Quote
  #4  
Old 24 Apr 2009
*Touring Ted*'s Avatar
Contributing Member
Veteran HUBBer
  
Join Date: Jul 2005
Location: Wirral, England.
Posts: 5,673
There are a few way to go about this and it all depends on how bad your cylinder is...

You might just get away with honing the bore if its just shiny in places. You need to measure the bore in a few different places to see how bad it is so don't go crazy just yet.

Yamaha sell piston rings for difference stages of overbore. Your dealer should be able to give you the specs for the rings.

What was the mileage ? Were you blowing oil before ???
__________________
Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
Reply With Quote
  #5  
Old 24 Apr 2009
palace15's Avatar
Registered Users
Veteran HUBBer
  
Join Date: Feb 2005
Location: LONDONISTAN, England
Posts: 1,034
Hi Mardi
These people in Sutton have a pretty good reputation, although you may well find somone closer to you in London. Sutton Rebore Service Ltd Sutton, 36 Lind Road Sutton - Engine Rebuilding & Reconditioning
__________________
'He who laughs last, was too slow to get the joke'
Never confuse the map with the journey.
Reply With Quote
  #6  
Old 24 Apr 2009
pottsy's Avatar
Gold Member
Veteran HUBBer
  
Join Date: May 2007
Location: london, uk.
Posts: 360
Quote:
These people in Sutton have a pretty good reputation, although you may well find somone closer to you in London. Sutton Rebore Service Ltd Sutton, 36 Lind Road Sutton - Engine Rebuilding & Reconditioning
Just got my xt6's rehoned barrel done by these guys from personal recommendation - 12.5GBP+vat. Just used a new set of std rings as it wasn't a rebore. Planning on a rebuild of it all this weekend.
Reply With Quote
  #7  
Old 24 Apr 2009
Registered Users
Veteran HUBBer
  
Join Date: Oct 2007
Location: London
Posts: 301
Valve seatings
Quote:
Originally Posted by tedmagnum View Post
There are a few way to go about this and it all depends on how bad your cylinder is...

You might just get away with honing the bore if its just shiny in places. You need to measure the bore in a few different places to see how bad it is so don't go crazy just yet.

Yamaha sell piston rings for difference stages of overbore. Your dealer should be able to give you the specs for the rings.

What was the mileage ? Were you blowing oil before ???



Only done about 500 miles since buying it - so problems were possibly inherited. Ran okay until head gasket went.

Used a digital caliper to measure round the cylinder and the difference is max 0.08mm. Not sure if thats critical?

Anyway - cylinder seems least of my problems.

Ground the valves just now (wow! didn't know one can have so much fun twirling sticks!), and discovered that both exhaust valve seatings are pretty crappy (very unevenly worn) which I'm told will need reseating?

I guess best thing is just to take the head and cylinder to a machine shop to have both checked out and fixed.


PLUS one of the inlet valves wouldn't come out smoothly... it gets stuck- seems like the valve stem is bent. (Cos I tried the other valve in the same hole, and it slid in and out easily)

Soooooo.. I'm going to cry for a little bit. Have some wine. And then tomorrow think about what to do next. (Have my hair done, I'm thinking).


If anyone has a spare valve floating about...
__________________

Some great quote about hard core travel that nobody has said yet.[/URL]
Reply With Quote
  #8  
Old 25 Apr 2009
*Touring Ted*'s Avatar
Contributing Member
Veteran HUBBer
  
Join Date: Jul 2005
Location: Wirral, England.
Posts: 5,673
Quote:
Originally Posted by XT GIRL View Post


Only done about 500 miles since buying it - so problems were possibly inherited. Ran okay until head gasket went.

Used a digital caliper to measure round the cylinder and the difference is max 0.08mm. Not sure if thats critical?

Anyway - cylinder seems least of my problems.

Ground the valves just now (wow! didn't know one can have so much fun twirling sticks!), and discovered that both exhaust valve seatings are pretty crappy (very unevenly worn) which I'm told will need reseating?

I guess best thing is just to take the head and cylinder to a machine shop to have both checked out and fixed.


PLUS one of the inlet valves wouldn't come out smoothly... it gets stuck- seems like the valve stem is bent. (Cos I tried the other valve in the same hole, and it slid in and out easily)

Soooooo.. I'm going to cry for a little bit. Have some wine. And then tomorrow think about what to do next. (Have my hair done, I'm thinking).


If anyone has a spare valve floating about...
With that discrepency, I would just hone the cylinder and if the cylinder is within standard spec, a new set of standard rings (about £25). Its probably just glaze on the bore.

You can hone your own cylinder if you have a powerdrill and a DIY hone but paying someone £12.50 is even better value, especially if you haven't done it before.

Cylinder Hone Set 4-in1 Sealey VS029

A test to see if your valve is seating is to reinstall them then pour WD40 into the exhaust and inlet ports and see if it dribbles out at all (best leave it 20 mins or so)..

I take it when you ground your valves you used 2-3 different grades of grinding paste ??? You should get them to seat properly with twiddling sticks.

As for the valves, some are easier to get in and out that others. Doesnt necessarily mean they're bent although its not hard to check with a straight edge. Maybe they just need decarbonised with some VERY FINE wet n' dry paper. As long as they slide easily when installed, it "should" be ok.


But... if you can't be arsed with it all (and who could blame you), getting a machine shop to clean your bore and seat your valves (with NEW SEALS) shouldnt be too expensive. £100 maybe.
__________________
Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
Reply With Quote
  #9  
Old 25 Apr 2009
Caminando's Avatar
Moderated Users
Veteran HUBBer
  
Join Date: Jan 2006
Location: DogZone Country
Posts: 1,218
See my post and link about bike engineering in London. -ABE .
Reply With Quote
  #10  
Old 28 Apr 2009
Registered Users
Veteran HUBBer
  
Join Date: Oct 2007
Location: London
Posts: 301
Where?
Quote:
Originally Posted by Caminando View Post
See my post and link about bike engineering in London. -ABE .
Can't find it... link?
__________________

Some great quote about hard core travel that nobody has said yet.[/URL]
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
Oil recommended by Yamaha is ukiceman Yamaha Tech 1 8 Apr 2008 22:15
recommended motorcycle insurers? UTS Rich Trip Paperwork 2 1 Apr 2008 12:30
Recommended PDA for GPS CornishDaddy Communications 5 27 Jul 2007 01:44
nx650 dommie rebore? gozell Honda Tech 5 28 Aug 2003 02:05
Recommended Maps? Ian South America 1 27 Oct 2001 11:23

 
 

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

25 years of HU Events
Be sure to join us for this huge milestone!

ALL Dates subject to change.

2025 Confirmed Events:

Virginia: April 24-27
Queensland is back! May 2-5
Ecuador June 13-15
Germany Summer: May 29-June 1
CanWest: July 10-13
Switzerland: Date TBC
Ecuador: Date TBC
Romania: Date TBC
Austria: Sept. 11-14
California: September 18-21
France: September 19-21
Germany Autumn: Oct 30-Nov 2

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!

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 01:14.

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