The XL600 thread

Discussion in 'Thumpers' started by Gregster, Jul 6, 2007.

  1. davek181

    davek181 Long timer

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    Aug 2, 2007
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    How many miles on the bike? You may get comments from other well meaning people that you should do the cam chain and guides, cylinder head refurbish with all new new guides and valve and rocker, etc. All of this can be very true depending upon mileage and intended usage. If you are going to ride cross country and want no troubles then, maybe yes. if you are going to use it like I do where I use it for my summer commuting with occasional adventures where I rarely get more than a couple of hundred miles from home, then you can be a little less demanding on overall condition.

    I replaced my cam chain and transmission and crank bearings last time I had it apart involuntarily for crankshaft failure due to the fact that it had 40,000 miles on it then. I also changed a couple of gear ratios then too, just beacause I was there and could easily at that time. If the crank had not failed I would still be riding it with no worries.
  2. crobox

    crobox Been here awhile

    Joined:
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    Taos, NM
    The bike shows 28,000 miles on the odometer... but I have only put about 200 miles on it myself, and I don't know anything about the bike's history before me. And, I am reasonably sure someone has freshened up this engine somewhat recently. Everything inside looks very clean.

    Here is the piston, which I exposed today...

    [​IMG]

    Pretty much every part of this engine that I uncover looks clean and within spec.

    I am fairly certain that I my game plan is to go ahead and use the new Wiseco piston and bored cylinder, have the valves and seats ground, do new valve stem seals and gaskets, and call it a day. The camshaft and rockers look practically brand new and the cam lobes are nowhere near the service limit, so I think I will leave all that stuff alone. I haven't measured the valve stems yet but I'm keeping my fingers crossed that they're good. I'll do that tomorrow... Or Monday.

    Cheers,
    Christian
  3. davek181

    davek181 Long timer

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    Sounds like you are on the right path, freshen it up a little and big bore too. You will love it. Maybe the prior owner redid the valves too.

    Hints of the day: Use genuine Honda gaskets and seals for best results. You can reuse the rocker cover gasket. Be really careful on cylinder head bolt retorque, the threads are a little weak, go to the low side of the specs. They can be heli-coiled if they do pull, I got some extra long ones for mine when that happened and it worked great.
  4. Edouard_Bracame

    Edouard_Bracame Adventurer

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    Sep 5, 2011
    Oddometer:
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    Bangkok, Thailand
    [​IMG]

    Rebuild Engine reinstalled in the frame, the seat is missing but I have to replace the cover as it is torned, You can see as well both auxiliary tanks installed on the rear fender(for the beer...;-)))...)

    [​IMG]

    New Wiseco piston installed 97.50mm, the XL 600 LM has the same bore diameter then the XR600.

    [​IMG]

    The Engine during the rebuild the play at the connecting rod was still within limit, so no need to install a Copper bushing.
  5. KT1

    KT1 RD07A - A like Adventure

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    WoWWW !




  6. KT1

    KT1 RD07A - A like Adventure

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    Hungary, Érd
  7. KT1

    KT1 RD07A - A like Adventure

    Joined:
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    Location:
    Hungary, Érd
  8. joexr

    joexr Banned

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    Jan 4, 2011
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    5,022
    Your wife rides a nice bike.
  9. m2h

    m2h "Old guys rule"

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    Nov 24, 2012
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    Waipu New Zealand
    Thanks for the reply, i havn't been able to do anything to the blke for a while but now xmas/new year madness has settled i'm on to it. Will have to start checking valve clearances and decomp etc. first but its a bit strange because when i did get it going it ran really sweet so i'm abit baffled. Glad to see your bore was ok , one less thing to worry about:clap
    m2h
  10. bnjgriffin

    bnjgriffin stoked mostly

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    Jun 30, 2009
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    Location:
    Carmel, CA.

    Hey Pete,
    If you have a California Carb, there is a couple of great photos back on page 163 from cynicwanderer which show what ports should be open or plugged. Hope that helps. :1drink
  11. bnjgriffin

    bnjgriffin stoked mostly

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    I am not sure what condition your tank is in but I found out that mine had some small rust/flaking inside (way down where it was hard to see) so it just kept sending "small" particles through the filters and these carbs are ultra sensitive so it kept causing blockage until I ended up changing out the tank and recleaning the carbs one last time. Maybe you can run a few cups from your petcock directly into a glass container just to make sure there is nothing getting by? :eek1
  12. bnjgriffin

    bnjgriffin stoked mostly

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    Carmel, CA.
    Your valves sound like they are perfect and the kicker does get a little softer when the engine is hot which unfortunately makes it harder to figure out when your'e at the right spot to giver her a kick,

    According to my manual, the stock jets are: primary #118, secondary #115, & slow #62. I am at sea level and I have an 87' California model which has all of the emission equipment removed and I changed my jets to 120, 118, & 65. Now she starts with 1-2 kicks every time and runs great even after fully warmed up. In my experience, these bikes seem to like lots more fuel than the stock jets allow. :freaky
  13. Ghost_Mutant

    Ghost_Mutant looking for bionics

    Joined:
    Aug 12, 2009
    Oddometer:
    727
    Location:
    border of granite & flats
    Ah, here is a good spot to ask a related question. I've been setting my valves to the newer spec used on the XRL: .004 & .005

    I had been using the original spec of .002 & .004

    Anybody else here with the older RFVC doing the valve spec upgrade?:ear
  14. RFVC600R

    RFVC600R SAND EATER

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    Whats the effect? more engnine noise??
  15. Edouard_Bracame

    Edouard_Bracame Adventurer

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    Bangkok, Thailand
    Here's the boring of my cylinder with a Van Norman Boring Bar.

    [​IMG]

    And another XL600LM that I will start to rebuild the engine next summer.

    [​IMG]
  16. brucifer

    brucifer Long timer

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    Hey GM. For what it's worth, my machinest guy who knows these (RFVC) engines very well has always said the stock Honda clearance was too tight. I think mainly because of oiling issues but also .002 doesn't allow much for thermal expansion. And we all know these bikes have their fair share of both. :lol3
  17. Edouard_Bracame

    Edouard_Bracame Adventurer

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    A clearance of 0.1mm at the intake and 0.12 at the exhaust is OK
  18. RFVC600R

    RFVC600R SAND EATER

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    Is there any hard tuned XL600Rs? I'm sure there is.... I want to know what I can do to increase the power without hindering long term usefulness too much. I'm thinking about getting a second job just to tune this beast. :wink: Drooling over XRs only parts but do i have other options??

    Don't get me wrong, it still wants to wheelie out of turns and has plenty of power, but I want to make this MY bike.

    I got to pull the engine to stop the notorious oil leak from the valve cover, might as well make it worthwhile. I can live with a leak for a few more months while i gather parts.

    All I know is the receipt from the PO's last rebuild said "WISECO HI-COMP" as one of the new parts listed but it doesn't say the ratio and the PO didn't know either :cry
  19. Ghost_Mutant

    Ghost_Mutant looking for bionics

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    It might be noisier but I couldn't tell. My thinking is the same as Bruce. Honda must have changed the clearance specs after real world testing on the early RFVC:lol3

    Right, but I was wondering if its better for longevity with the larger clearances.:D

    0.1/0.12mm are the metric versions of .004/.005in for those of us in the US.

    I can't think of a single reason not to use the newer XRL specs, but I was looking for feedback from someone who thought differently.
  20. Ghost_Mutant

    Ghost_Mutant looking for bionics

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    border of granite & flats
    :rofl:rofl

    No, I had to wait until after work before I could even check out the new posts on ADV. No posting on the job, big brother and all of that jazz:lol3