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Call all XR600R!!!

Discussion in 'Thumpers' started by CSMonte, Dec 8, 2008.

  1. lookfar

    lookfar from the land of OZ Supporter

    Joined:
    Feb 13, 2011
    Oddometer:
    1,445
    Location:
    D'aguilar
    If you can measure the piston, you will get an idea on the bore size. If it has been run hard as you say, I would get the next size up piston, and take it to a reputable engine shop to get the cylinder bored. Might as well take the head there too, and get them to give it a clean up and valve job. They should also be able to reface the head if it has warped.
    MCMA111 likes Engine Dynamics, I think they are in the SF area. I am on the other side of the world, so not really familiar with localities.

    I like to use Pro-X cast pistons, but each to their own. I build my engines for longevity, haven't had one burn oil yet, so not doing too bad.
    I use OEM valves if needed, most of my engines are around 30 years old, so new valves should last another 30 or so years.

    Give the tensioner shaft a light rubbing with 1200 emery paper to remove any marks from the tensioner, small marks can cause the dreaded timing chain tic.

    The top tensioner shaft has small marks on it from the tensioner, these were enough to cause the timing chain tic. Bottom shaft is new.
    IMG_1319.jpg
    Thebusdweller and MattLikeyBikey like this.
  2. JAB

    JAB Unsprung Weight Supporter

    Joined:
    Dec 2, 2004
    Oddometer:
    1,710
    Location:
    Beautiful Monrovia
    All good advise. Replace the timing chain and the tensioner spring and have good look at the guides too. I am very happy with Honda parts when available. check the cam, rockers and cam center bearing on the cam and head.
    MattLikeyBikey likes this.
  3. mcma111

    mcma111 Long timer

    Joined:
    Jul 17, 2007
    Oddometer:
    17,857
    Location:
    San Francisco,Ca.
    Matt,

    Wiseco piston. Chose from a 97.5mm, 98mm or 100mm.

    Here is my recent build with a 98mm.

    [​IMG]

    Valve job. Cut seats and grind valves, new seals,

    [​IMG]

    [​IMG]

    .
  4. MattLikeyBikey

    MattLikeyBikey Been here awhile

    Joined:
    Nov 8, 2018
    Oddometer:
    561
    Location:
    So Cal
    Steve, those are some great images! Speaking of which - it seems like I need to get the piston first and provide that to the shop correct?
  5. mcma111

    mcma111 Long timer

    Joined:
    Jul 17, 2007
    Oddometer:
    17,857
    Location:
    San Francisco,Ca.
    Yes. The cylinder is bored to the piston. You can see how accurate Mike gets his finished bore to the piston
    MattLikeyBikey likes this.
  6. XRHondafan

    XRHondafan Long timer

    Joined:
    Oct 29, 2016
    Oddometer:
    2,156
    Steve

    How do you get the engine as clean as that?
  7. mcma111

    mcma111 Long timer

    Joined:
    Jul 17, 2007
    Oddometer:
    17,857
    Location:
    San Francisco,Ca.

    Bead blast then prime coat, color coat, clear coat. Cylinder and head left bare.

    .
    XRHondafan likes this.
  8. XRHondafan

    XRHondafan Long timer

    Joined:
    Oct 29, 2016
    Oddometer:
    2,156
    Does that kinda treatment last ?
  9. mcma111

    mcma111 Long timer

    Joined:
    Jul 17, 2007
    Oddometer:
    17,857
    Location:
    San Francisco,Ca.
    Sure. Once it heat cycles a couple times it's stuck pretty good.
  10. JAB

    JAB Unsprung Weight Supporter

    Joined:
    Dec 2, 2004
    Oddometer:
    1,710
    Location:
    Beautiful Monrovia
    I can vouch for the paint. Did the same thing and it has held up well and looks nice.
  11. Hurricane Bob

    Hurricane Bob Long timer

    Joined:
    Jun 6, 2007
    Oddometer:
    3,013
    Location:
    Rhode Island


    YouTube find of the day
    blahzik and thebigman like this.
  12. VittoXVIII

    VittoXVIII Adventurer

    Joined:
    Mar 1, 2013
    Oddometer:
    60
    Location:
    Switzerland / Italy.
    So, I've just bought this gem

    XR 600 R Frame with a few mod (1987)
    NX 650 engine
    XR 600 dual carbs (not sure about this one...)
    CR 250 forks
    CR 250 front brake
    Unknown rear brake
    Whatelse....mmh, wheels are supposed to be from a Nx 650

    Rides ok but it's going to be a long process to fix it up as I want it to be.

    Attached Files:

    MattLikeyBikey likes this.
  13. Al-X

    Al-X Been here awhile

    Joined:
    Dec 26, 2007
    Oddometer:
    379
    Location:
    Johannesburg, South Africa
    Thats a proper hybrid!! Greta will be glad....
  14. lookfar

    lookfar from the land of OZ Supporter

    Joined:
    Feb 13, 2011
    Oddometer:
    1,445
    Location:
    D'aguilar
    must have the ‘87 twin carb head on it, all the NX engines were single carb
    XRHondafan likes this.
  15. dedgerly207

    dedgerly207 Adventurer

    Joined:
    Apr 15, 2014
    Oddometer:
    89
    Hello All,

    Very new to the forum and a proud new owner of a non running 1987 XR600. Purchased it last weekend for 600. I previously owned a 1998 XR400 in college and stupidly sold it. Regretting it ever since, I recently got the XR bug and found this 1987 that appeared to be complete but had not been started in who knows how long.

    Upon first inspection it appears that the kick starter lever does not return to the up position. I have searched the forum and realize that I need to remove the right side engine cover and inspect the kick start mechanism. I just ordered the Clymer manual yesterday so hoping I can tackle this on my own.

    It also appears that the PO has put gasket maker on just about every case mating surface I can see....both engine side covers, cylinder and head. Looks like someone smeared it on with their finger so I assume the motor has been apart before. It has a homemade oil cooler piped into the oil circuit which plan to remove as it does not look like it would fair well offroad. I will try to post some photos.

    My plan of attack is to pull the carbs off the bike and go through them. I would like to repair the kick started spring and reassemble the bike to start it. At that point I would like to assess if the motor needs a teardown and rebuild. Does that sound like a decent plan of action? I shoudl not start the bike with the broken kick start spring; correct?

    Or should I just assume the worst, pull the motor out and begin the teardown and rebuild process?

    My plan for the bike to build a reliable dual sport. It is basically winter here in New Hampshire (USA) so getting the bike going and riding it very far is probably not going to happen.

    Really appreciate anyones insight.

    xr600_1.png
  16. Thebusdweller

    Thebusdweller Been here awhile

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    Nov 23, 2012
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    177
    Location:
    Nevada
    PM sent
  17. dbur971

    dbur971 Been here awhile

    Joined:
    Jun 19, 2014
    Oddometer:
    196
    Location:
    PNW
    Used a normal seal puller. Took about 10 seconds to pull out. Way easier than drilling holes and driving in screws and less likely to mar something up.
    upload_2019-12-7_17-30-35.png
    T4EaterJonny likes this.
  18. T4EaterJonny

    T4EaterJonny Not too hip...

    Joined:
    Oct 11, 2012
    Oddometer:
    324
    Location:
    Corona, ca
    Nice! This thread is dead. Has everyone put away their pigs for the winter already?!
  19. OBD

    OBD Other Brother

    Joined:
    Nov 30, 2011
    Oddometer:
    250
    Location:
    New England
    sort of.
    mine’s patiently waiting on the back porch

    486A311B-7B5D-4636-A786-E9BC76793911.jpeg
    bork likes this.
  20. Ron50

    Ron50 Long timer

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    Oct 12, 2008
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    3,377
    Location:
    Canberra
    Nah, Saturday.

    grimme south.JPG
    grimme puddle.JPG
    xr at murphy.JPG
    blockage.JPG
    rustyx, bork and mrsdnf like this.