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Discussion in 'Thumpers' started by onaXR, Jan 18, 2006.

  1. tractor4play

    tractor4play Been here awhile

    Joined:
    Jan 16, 2009
    Oddometer:
    115
    i have just done a dry build with a rfvc 650 bottom mated to xl600r barrel,stock piston and twin carb head.
    without gaskets the piston is 1.3mm above deck height.so with double base gaskets and stock head gasket i should just about clear zero deck.
    has anybody done this without issues..valve to piston clearance etc.
    any advice would be great.
  2. joexr

    joexr Banned

    Joined:
    Jan 4, 2011
    Oddometer:
    5,022
    Acerbis made the white ones. Don't know if they're still available though.
  3. fritzcoinc

    fritzcoinc Enjoying my last V8

    Joined:
    Apr 30, 2008
    Oddometer:
    7,951
    Location:
    Hockley, Tx

    That much piston above the top of the cylinder is not going to work.
    The head gaskets are designed to be between a flat surfaces and not another gasket.
    If you want to pursue make a 1.3MM solid copper cylinder base gasket.

    Back in the late 70's when alcohol fuels first hit the scene, I was riding a Moto Guzzi Sport and tried two head gaskets to reduce the compression to something that the alcohol/gasoline fuel could tolerate without knocking like a forge hammer. The stack of gaskets just would not hold a seal long.
  4. smokeeater495

    smokeeater495 Been here awhile

    Joined:
    Oct 14, 2008
    Oddometer:
    615
    Location:
    N.E. Indiana
    Doesn't alcohol fuel like higher compression?
  5. Break_Syncro

    Break_Syncro Been here awhile

    Joined:
    May 17, 2008
    Oddometer:
    189
    Location:
    Sherbrooke, QC
    If you make a 1.3 mm copper , there might be a chance that your timing chain will end up tighht. Ask me how I know...
  6. fritzcoinc

    fritzcoinc Enjoying my last V8

    Joined:
    Apr 30, 2008
    Oddometer:
    7,951
    Location:
    Hockley, Tx
    When alcohol/ethanol fuels hit the market even my 6 cyl. Ford knocked when using these fuels.
    I was relating this experience to lend creditability to my recommendation of not using two head gaskets based upon actual experience doing so.
    I ran two gaskets for quite some time as I was riding my Sport daily to work.
    After a rather short time the gaskets would leak and burn through.
    Because of the poor reliability of two head gaskets I made a base gasket of pipe flange gasket material. It was a little thicker than two Guzzi head gaskets.
    There was a reduction in performance but the bike got me where I was going till I could put lower compression pistons suitable for the newer fuels.

    Here's the old Sport outside my "pad" with it's custom cover:
    [​IMG]

    It was a cool bike. I had to be the first Sport Biker in Houston. Note clip on handlebars
    and 10 HP worth of stickers:

    [​IMG]
  7. beechum1

    beechum1 Dandole Gas al Burro

    Joined:
    Oct 14, 2007
    Oddometer:
    9,577
    Location:
    Not home in Tijuana
    Jeff suggested these in the XR600 thread when you axed the same question a week ago.
  8. techforlife

    techforlife CDI REPAIR

    Joined:
    Sep 21, 2008
    Oddometer:
    4,435
    Location:
    Moncton,New Brunswick
    Who makes them boss

    B
  9. KyoXR

    KyoXR Clouds, Snow, Rain

    Joined:
    Mar 1, 2010
    Oddometer:
    869
    Location:
    CA
    Thanks for posting the link, my enthusiasm was cut a little bit short when I found out they only make Aluminum rear sprockets but I'm still happy there is a option for custom sprockets.
    plus they have that hard coat option and a option to go Xtra Lite.
  10. mrfixit54016

    mrfixit54016 Wisconsin Dual Sporter

    Joined:
    Jan 19, 2008
    Oddometer:
    757
    Location:
    Hudson, WI
    Go to Fleabay and type in


    99 XR600R Acerbis Frame Guards


    And I bet you may find some there.

    Or try Power Sport Junkie or many others for the UFO brand.

    http://www.powersportjunkie.com/UFO-HO02685041-p/pu-12-488-29.htm
  11. ThumpnRed

    ThumpnRed Pig Wrangler

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    Aug 30, 2009
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    2,621
    Location:
    Eye Duh Hoe
    Yes
  12. tractor4play

    tractor4play Been here awhile

    Joined:
    Jan 16, 2009
    Oddometer:
    115
    I would like some opinions from the redular gang on here.
    HT,Steve and CW etc.
    Regarding the camchain being 1.3mm out of place i dont think it would
    have a noticeable effect.Please correct me if i am wrong.
    Thanks T.
  13. techforlife

    techforlife CDI REPAIR

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    Sep 21, 2008
    Oddometer:
    4,435
    Location:
    Moncton,New Brunswick
    You`d have to slot the cam gear.....as the timing will be advanced......might not hurt a thing,,but it will increase low end at the expense of top end power..

    Increase the thickness of the base gasket........do not double up on the head gaskets..or a solid copper head gasket works too.

    B
  14. Hazman27

    Hazman27 The Haz

    Joined:
    Nov 26, 2012
    Oddometer:
    685
    Location:
    St. Louis, MO
    I just never saw the answer, sorry, but thanks for the info.
  15. Hazman27

    Hazman27 The Haz

    Joined:
    Nov 26, 2012
    Oddometer:
    685
    Location:
    St. Louis, MO
  16. mcma111

    mcma111 Long timer

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    Jul 17, 2007
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    Location:
    San Francisco,Ca.

    If the piston is 1.3mm above the top of the cylinder and you used a 1.3 mm spacer of some type at the bottom of the cylinder you would end up raising the center of the cam 1.3 mm. You would not see 1.3 mm on one side of the cam chain but .65 mm on either side. 1.3 mm split by 2 = .65 mm. The cam timing change would be negligible.
  17. joexr

    joexr Banned

    Joined:
    Jan 4, 2011
    Oddometer:
    5,022
    You've got it backwards. I f the cam goes up 1.3mm , that's 1.3mm per side and2.6mm total slack out of the chain. Can the tensioner give that much?
  18. nic579

    nic579 x

    Joined:
    Dec 17, 2012
    Oddometer:
    388
    Location:
    Western NY
    I got my slow air screw kit this week and looking at it next to a slow air screw I am puzzled as the adjustable screw needs a much larger hole. Is the slow air jet passage a stepped hole?
  19. techforlife

    techforlife CDI REPAIR

    Joined:
    Sep 21, 2008
    Oddometer:
    4,435
    Location:
    Moncton,New Brunswick

    That`s not the only issue.like i said........

    Look at it like this.......the timing chain is under under tension on the rear side...the front is basically straight up/down from gear to gear....now..if you raise the head the cam gear cannot go straight up in the front without the cam gear turning from it`s TDC marks to allow the slack.........the tensioner side will allow that because all the slack is on that side..........so if you raise the head.......all chain slack is provided by the tensioner side so cam timing will be an issue...

    If the head moves up 1.5mm ...........all that chain slack comes from the tensioner side and the cam turns to provide all that 1.3mm clearance needed..

    So the cam will turn that 1.3mm and you are right that 2.6mm chain slack is needed to even lift the head that much..

    And you have a valid point,will it allow 2.6mm of extra chain length without issues..

    B
  20. gentlwolf

    gentlwolf Adventurer

    Joined:
    Oct 9, 2012
    Oddometer:
    79
    Location:
    VANCOUVER BC
    With no mechanic buddies to ask and being a baby to all this stuff you guys are my hope for some sanity..

    in short heres the story.

    Bought first bike(95 xr650l, stock jets, k&n filter, stock muff) after cruising this forum for months and really getting to love these xrls.

    got ripped off unfortunately (desperate for summer ride)

    bike was not treated nicely by last owner (sold it with no oil showing on the dipstick) which i didnt even think to check until after i rode it home.. :/

    every time i looked closer at the bike, more problems.

    cleaned carb, cleaned filter, new muffler gaskets, oil change, new spark (came out jet black carbon fouled after every ride) ..seemed to ride o.k. but..

    high end of any gear = smoke smoke smoke

    1st compression test : DRY 100psi WET 115psi (decomp engaged)

    (thought that cant be right.. adjusted valve clearence)

    2nd compression test: DRY 85psi WET 88psi (decomp engaged)

    manual says 92psi with decomp engaged..

    wasnt really sure how bad those readings were but went into the top end this is what it looks like..

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]
    there was definatly some slight play in the piston pin and when i rock the connecting rod side to side it moves about 1mm but has no up and down freeplay


    not sure how helpful those photos are for enlightening me on what kind of top end job i should do here but

    i guess im just looking for any advice regarding what parts i should be looking into and where to get? /next course of action

    or any advice at all about anything at all hah.

    also wondering about some tools.. whats a good sized torque wrench to get for these bikes? brand? preferences/ opinions

    (sorry for flood of pics)

    cheers, you guys rule. :D