KTM LC4 (640) Thread Index

Discussion in 'Thumpers' started by meat popsicle, Jul 9, 2005.

  1. juames

    juames Have Fun, Don't Die!

    Joined:
    Aug 16, 2008
    Oddometer:
    2,554
    Location:
    Ottawa
    Worth doing both intake and exhaust?
  2. Dolly Sod

    Dolly Sod Red Clay Halo

    Joined:
    Aug 18, 2003
    Oddometer:
    14,072
    Location:
    Richmond, Va
    I'd never heard of a speedy sleeve before. That's exactly what I'm looking for. :thumb

    Good idea.
  3. enduro0125

    enduro0125 Sticks and Stones™..

    Joined:
    Nov 16, 2006
    Oddometer:
    15,115
    Location:
    Orchard Park,NY
    Yes.
  4. skibum69

    skibum69 slave to gravity

    Joined:
    May 14, 2006
    Oddometer:
    5,625
    Location:
    New Melbourne, Newfoundland
    Do it, don't end up like I did:lol3
  5. enduro0125

    enduro0125 Sticks and Stones™..

    Joined:
    Nov 16, 2006
    Oddometer:
    15,115
    Location:
    Orchard Park,NY
    Or me.
  6. dnrobertson

    dnrobertson Big Bike, Slow Rider

    Joined:
    Jun 30, 2008
    Oddometer:
    857
    Location:
    Frankston, Australia
    :nod

    Yep. Do it BEFORE the 3 day ride or end up like me :cry (new cam, new valves, new ...)
  7. NSFW

    NSFW ktm's "the tourist"

    Joined:
    Feb 20, 2007
    Oddometer:
    16,945
    Location:
    Burbank CA
    congrats and good luck!

    i too went bigger. bought a 950 and after a year 1/2, sold the big bike. it's heavy and big for my kind of riding.
    today, i still love my 640, it has taken me to a lot of different places, see my sig line. it's my trusty steed.

    true, the bike is transitional, one day most of us will all be switching to another one. mine may last longer since i have a spare 640a that i use as my parts bike.....:D

    the most valuable element on this thread is the people - always ready to help and provide reliable info....:evil

    that's one reason i hang out here more than in any other bike specific thread. thanks to meat and contributors.

    keep up the good work guys!...:thumb
  8. NSFW

    NSFW ktm's "the tourist"

    Joined:
    Feb 20, 2007
    Oddometer:
    16,945
    Location:
    Burbank CA

    same here.

    the front wheel, i mean the hub, bearing and seal must be from a 525exc and using a bushing with a 20 mm bore to fit the 640 front fork.

    boon boon, measure the bushing od, and if it is 26 mm, then our hunch is right.

    if that's the case, you need the bearing and seals for the 525 exc, i have a 2003 (first year model) 525 exc and has 26mm axle.
  9. liferider

    liferider Never It's enough

    Joined:
    Nov 27, 2007
    Oddometer:
    648
    Location:
    Patagonia
    NSFW, similar stories yours and mine with the 640A, will see how ends mine.
    I would love to keep both, but my budget says NO.

    I had an awesome experience in both 640 threads during 6 years, most of the guys here are incredible.

    .
  10. tileman

    tileman Been here awhile

    Joined:
    Mar 15, 2007
    Oddometer:
    898
    Location:
    Melbourne, OZ
    Since I've just joined the 640 adv fold any chance of some info regards to the screen in the above shot?

    Cheers in advance
  11. dnrobertson

    dnrobertson Big Bike, Slow Rider

    Joined:
    Jun 30, 2008
    Oddometer:
    857
    Location:
    Frankston, Australia
    To save liferider from answering this, here is the PM he sent me less than 24 hours ago when I asked him the same question.

    Hope you don't mind Alec.

    That screen is an aftermarket tall BMW GS650.

    Here it is as it comes:
    http://www.advrider.com/forums/showt...erome&page=374

    And here as it looks with black vinyl :
    http://www.advrider.com/forums/showt...erome&page=375

    And here are the mounting points and the performance numbers:
    http://www.advrider.com/forums/showt...erome&page=377


  12. liferider

    liferider Never It's enough

    Joined:
    Nov 27, 2007
    Oddometer:
    648
    Location:
    Patagonia
    Thanks!
    :thumb

    .
  13. Syncrosimon

    Syncrosimon Numpty

    Joined:
    Sep 9, 2011
    Oddometer:
    32
    Location:
    Devon, England.
    Hi there,

    Hello fellow bloggers, hope this post is in the right place.

    I need advice from the enlightened LC4 fetishist's.


    I have a 1999 LC4 400D (UK) and use it for commuting and off roading. I have had the bike for 2 years now and have increased the mileage from 6500 miles in april 2010 to just under 15000 miles this week.

    <a href="http://www.flickr.com/photos/91013874@N02/8266935345/" title="Untitled by Snuffkins hat, on Flickr"><img src="http://farm9.staticflickr.com/8218/8266935345_e68c424145.jpg" width="500" height="375" alt="Untitled"></a>
    <a href="http://www.flickr.com/photos/91013874@N02/8266937329/" title="Untitled by Snuffkins hat, on Flickr"><img src="http://farm9.staticflickr.com/8200/8266937329_6a08e996c9.jpg" width="375" height="500" alt="Untitled"></a>
    <a href="http://www.flickr.com/photos/91013874@N02/8266937991/" title="Untitled by Snuffkins hat, on Flickr"><img src="http://farm9.staticflickr.com/8499/8266937991_be2fedf3e1.jpg" width="375" height="500" alt="Untitled"></a>

    I am very particular about oil changes and have been using 10-40w semi synthetic with an interval of 1000 miles. Over the last 2 years and 8500 miles the oil changes have generated less and less swarf and shiny broken fragments to now where there is only a dusting of metal filings and a few chrome looking tiny slivers like glitter.

    The reason for this thread, well something has changed in the engine. The sound is different, there is more top end clatter. The motor pulls strong and revs freely. I am concerned that something has begun to happen, and want to catch it before it gets expensive.

    This engine has never been apart, it has the old style bearing still in there.

    Here are some photos of the internals.

    <a href="http://www.flickr.com/photos/91013874@N02/8267927918/" title="Untitled by Snuffkins hat, on Flickr"><img src="http://farm9.staticflickr.com/8480/8267927918_dacf5900ed.jpg" width="500" height="375" alt="Untitled"></a>
    <a href="http://www.flickr.com/photos/91013874@N02/8266860053/" title="Untitled by Snuffkins hat, on Flickr"><img src="http://farm9.staticflickr.com/8501/8266860053_df8e96c7d5.jpg" width="500" height="375" alt="Untitled"></a>

    The inside of the top oil pump.<a href="http://www.flickr.com/photos/91013874@N02/8267928790/" title="Untitled by Snuffkins hat, on Flickr"><img src="http://farm9.staticflickr.com/8359/8267928790_c9128a0613.jpg" width="500" height="375" alt="Untitled"></a>

    The rotor.<a href="http://www.flickr.com/photos/91013874@N02/8266860609/" title="Untitled by Snuffkins hat, on Flickr"><img src="http://farm9.staticflickr.com/8069/8266860609_f959bff101.jpg" width="500" height="375" alt="Untitled"></a>

    The other rotor thing.<a href="http://www.flickr.com/photos/91013874@N02/8266860979/" title="Untitled by Snuffkins hat, on Flickr"><img src="http://farm9.staticflickr.com/8066/8266860979_779c258b11.jpg" width="500" height="375" alt="Untitled"></a>

    The bearing retainer inner edge. <a href="http://www.flickr.com/photos/91013874@N02/8266861723/" title="Untitled by Snuffkins hat, on Flickr"><img src="http://farm9.staticflickr.com/8338/8266861723_93d109debf.jpg" width="500" height="375" alt="Untitled"></a>

    And the old style bearing.
    <a href="http://www.flickr.com/photos/91013874@N02/8266858551/" title="Untitled by Snuffkins hat, on Flickr"><img src="http://farm9.staticflickr.com/8358/8266858551_c123633668.jpg" width="500" height="375" alt="Untitled"></a>

    Everything looks nice and new. The bearing feels tight, and spins freely.

    Should I replace that bearing with the new style one. I have the parts sat waiting, but cant see any point if the old one is good.

    Secondly, should I take the top end apart, the clatter must come from there. How far should I tear it down. Just the lid off. I need to take the water pump out and sort this little problem.

    Change your coolant. I reckon this is the original coolant. loops!
    <a href="http://www.flickr.com/photos/91013874@N02/8266858885/" title="Untitled by Snuffkins hat, on Flickr"><img src="http://farm9.staticflickr.com/8341/8266858885_1cbb83f235.jpg" width="500" height="375" alt="Untitled"></a>

    Hopefully there will not be any major issues, and the noise is just the engine maturing.

    Any advice is very welcome. I would describe myself as a competent home mechanic. I have none of the specialist tools.

    Simon.
  14. clintnz

    clintnz Trans-Global Chook Chaser

    Joined:
    May 17, 2004
    Oddometer:
    3,662
    Location:
    Rotoiti, New Zealand
    Have you checked the valve clearances lately? Often the first thing to wear out in these motors, at anything from your mileage up, will the inlet cam follower roller bearing - you'll be able to check that out when you pop the top to take out the water pump.

    Cheers
    Clint
  15. Syncrosimon

    Syncrosimon Numpty

    Joined:
    Sep 9, 2011
    Oddometer:
    32
    Location:
    Devon, England.
    Thanks for the reply,

    Valves checked 3000 miles ago. Needed little or no adjustment.

    I think you are right, I will have to take the lid off and see what is under there.

    Is taking the rocker cover off easier with the engine out? Or can it be done safely left in site?

    Simon.
  16. dnrobertson

    dnrobertson Big Bike, Slow Rider

    Joined:
    Jun 30, 2008
    Oddometer:
    857
    Location:
    Frankston, Australia
    You can remove the rocker cover with the engine in the frame. Just takes a bit more work, but not much.

    There is plenty of details on this site about doing the job. At 15,000 miles, I wouldn't even bother about checking, just replace the inlet cam bearing. They can go to shit VERY quickly (mine went in a just over 700 kms and caused a large amount of damage).

    Have a look in the index at some of creepers threads about sealing the rocker cover and also about a bolt that can make it look like your cover is leaking).
  17. Syncrosimon

    Syncrosimon Numpty

    Joined:
    Sep 9, 2011
    Oddometer:
    32
    Location:
    Devon, England.
    Good advice, I have now read those threads (in part) and can see that most of the questions have been answered already. A bad time to get parts for the LC4 what with Christmas coming!

    Simon.
  18. tdreyer

    tdreyer KTiM

    Joined:
    Mar 24, 2008
    Oddometer:
    508
    Location:
    Used to live in Crestview FL, now ????
    Sincrosimon, if it turns out to be the intake roller going bad have a look at this.
  19. Superpacman13

    Superpacman13 Been here awhile

    Joined:
    Aug 6, 2011
    Oddometer:
    250
    Location:
    Springfield ORYGUN
    Thank you guys for making me check my rocker bearings! Just saved myself some serious dough, the inlet one was close to going kaboom.
  20. tdreyer

    tdreyer KTiM

    Joined:
    Mar 24, 2008
    Oddometer:
    508
    Location:
    Used to live in Crestview FL, now ????