The XL600 thread

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

  1. davek181

    davek181 Long timer

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    The oil has to be coming from the rocker box area somehow. There is no oil near the spark plug. Oil can creep in from remote places. Try the baby powder trick and determine where it comes from. I would then pull the engine and very carefully inspect the cover and head and carefully reseal it.
  2. AlpinaE24

    AlpinaE24 Been here awhile

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    Ok so 84-89 CR500s use the same upper/lower bearing as the XL/XR and bolt right on. 87-88 bikes had 43mm conventional cartridge forks(same as later 600/650l) and the 89-92 got 45mm USD showas. 90+ had the thicker stem base.

    The forks are not very good, but I bet with a rebuild and new oil they will do better than the 39mm moped specials. They will look cooler at the very least
  3. KT1

    KT1 RD07A Adventure

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  4. INTMD8

    INTMD8 Been here awhile

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    So today I unloaded the xl from my buddies truck (from the Moab trip) onto the lift for our dyno. Then I got the idea to dyno it. Wasn't sure how it was going to work out since it's an automotive dyno. Didn't work great as it spun the tire when I initially hit it, and I didn't have the rpm lead hooked up but at least I got to check the jetting with the wideband. This was with 13/44 gearing, 17psi tkc80 in 2nd gear.

    [​IMG]
  5. Carter Pewterschmidt

    Carter Pewterschmidt Long timer

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    34 hp doesn't sound bad. All you have in the bike is a piston and exhaust correct?
  6. Reposado1800

    Reposado1800 Juicy J fan!

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    The air fuel ratio looks good too.
  7. Edouard_Bracame

    Edouard_Bracame Adventurer

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  8. INTMD8

    INTMD8 Been here awhile

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    It has a piston, and fmf muffler. Also, I ported the head. Otherwise stock.

    Nowhere near ideal to dyno. Never cleaned the air filter since the trip and was on 91 octane from there as well. Just glad to see the jetting was good.
  9. Carter Pewterschmidt

    Carter Pewterschmidt Long timer

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    I'm not sure if a car dyno doesn't make a difference too. You have to roll over that big drum with a little bike motor, but whatever, cool that you did a pull with it. I plan on running mine sometime next summer just for grins.



    Maybe we can have all have a dyno competition...in a dual sport thread.:rofl
  10. Aaron from Texas

    Aaron from Texas Been here awhile

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    Haha, first to 40hp get's a prize...
  11. joexr

    joexr Banned

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    The dyno will read low on low RPM engines without the tach hookup.
  12. Carter Pewterschmidt

    Carter Pewterschmidt Long timer

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    Well then, better get back on those rollers before I do.:D
  13. davek181

    davek181 Long timer

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    The problem with dyno runs is that the values given are subject to a certain degree of error for various reasons, such as aforementioned tach values missing, and roller inertia needed and tire slippage.

    The real problem as I see it is that even with a fudge factor you have actual quantitative values that can't be argued much. Without actual facts claimed horsepower can be any numbers you care to state that are semi believable.

    Sometimes ignorance is bliss. Although on the other hand you are not required to share your results with anyone if you don't like them. If they are good though, you have bragging rights. Age old dillemma that probably goes back to caveman days where one's wheel was better or faster than another for various reasons, and also subject to interpretation.

    Dave
  14. Carter Pewterschmidt

    Carter Pewterschmidt Long timer

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    I want to do a few runs just for the sake of fuel tuning and with my mods if I make less than 34 hp I'll keep that graph to myself.:lol3
  15. AlpinaE24

    AlpinaE24 Been here awhile

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    Somebody needs to go EFI with microsquirt
  16. RFVC600R

    RFVC600R SAND EATER

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    So where does the supposed 43hp come from? measured at the crank?
  17. joexr

    joexr Banned

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    Maufacturer numbers are usually at the crank because the higher numbers sound better. It's also hard to compare wheel numbers from different dyno's.
  18. davek181

    davek181 Long timer

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    That is what we call BHP. Brochure horse power. Not to be confused with Brake horse power.
  19. Aaron from Texas

    Aaron from Texas Been here awhile

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    Well, it finally happened to me... I had the ol' girl on her side to pull the stator covery in order to re-goop up the stator wires (they started leaking again) and went to start 'er up...

    Since she was on her side, ignition off, decomp in, WOT, and kicked through about 15 times to clear everything out.

    Then, ignition on, decomp out, close throttle, find TDC, kick pass a click, then giver her a good kick and... WHAMMO! She kicked right back. HARD.

    My ankle is pretty sore this morning... :lol3
  20. davek181

    davek181 Long timer

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    I have been bitten hard before too, limped for quite a while. I do a cleanout kick procedure too whenever needed, but I have the ignition on when I do it to ignite any errant fumes. Throttle wide open, compression release open, ignition on, kick about 4 times and then follow normal starting procedure.

    I have never had it even remotely feel like starting or kicking back while doing the clearout with the ignition on, in fact I usually kill the engine by pulling the compression release rather than the switch or kill switch. I have replaced the battery with a capacitor so I rarely even turn the key off except when parking in public.