The XL600 thread

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

  1. Carter Pewterschmidt

    Carter Pewterschmidt Long timer

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    I've been through six different sets of dual carbs over the winter and I can confirm everything else you've said is true. The chokes are different from XR to XL but it's just a bracket that can be switched, which if I read correctly you've already done. The 83 XL carbs have the different mixture screw that goes into the side instead of being on the bottom. I'm wondering what the ID number is on that XL carb set you found with the hex jets.

    The ID numbers I've found go as follows. The two sets of 83 carbs I went through were the PH60 and the rest I found were all PH68. All of those had the slot style jets. The XR600R carb set was numbered PH52 and that had hex style with the quick change bowls. The only other set with hex jets I found were the XR500R carbs PH50. Those had the quick change bowls that are interchangeable with the XL carb bowls. (That's not the case with the XR6 PH52 carb bowls. Those have a different pattern on the bottom of the carb body so the bowls do not interchange to any other carb set I'm aware of.) I found out about the XR5 bowls because both the XR5 and XL6 carbs actually use the same O-ring kit part number which means all seals are the same pattern. Nice thing is that you even get the big quick change bowl plug O-ring. BUT when I tried to put the XL carb bowls on the XR carbs they wouldn't tighten down all the way because they bottomed out on the longer hex jet. Maybe you could crank them in a bit further but I didn't attempt it. You can see how much longer they are in this picture. I've finished my 83 XL carbs with the XR5 float bowls and I switched them to hex jets. They actually poke out the bottom of the plug hole which with a XL bowl would be close to if not touching bottom.

    [​IMG]
  2. brucifer

    brucifer Long timer

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    I see another poster answered already but here's what I came up with.

    [​IMG]
    Looks like 22 3/16.
    [​IMG]
    Pic of the progressively wound coils. It's 1 1/4 diameter here.
    [​IMG]
    Pic of the top. 1 3/16 here.
    [​IMG]
    Another pic of the bottom. Just for information, the service limit is 21.93 according to my Honda service manual.
  3. davek181

    davek181 Long timer

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    I stand corrected. I pulled the bowls off both the remaining XL carb sets I have one is a ph 68, and the other is a ph 64. both have the screw type jets. I guess I never paid much attention since I was always dealing with my xr carbs and hex jets with screw off covers. By the way, the jet projection you show on the hex jet is very close to what I am used to seeing. You can just get a wrench on it to change it.
  4. ElMartillo

    ElMartillo I See Faces...

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    UPDATE: Apparently I was mis-diagnosing the problem. Noticing the spark plug was wet with fuel after multiple attempts to start, I noticed the choke plunger was up slightly out of it's normal closed position on the carb. Looking at the other end of the cable at the handlebars I found the cable-end was out of it's normal position and was hung up on the holder, effectively holding the choke closed very slightly. This is what was causing the lack of ignition. Started up and runs great now!

    Happy it wasn't an expensive fix, as this is a low-budget project...

    Now to see how the new fork oil and steering bearings affect the handling in the dirt!

    Cheers all! :thumb
  5. Carter Pewterschmidt

    Carter Pewterschmidt Long timer

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    That's why I changed out the bowls. I have changed jets on the standard XL carbs without removing the carbs from the bike, but it's a bit of a pain taking both the bowls off. With the XR5 bowls it looks like it's just drain the bowl, unscrew the cap, and get a little ratchet on the jet. You're post about your XR carbs inspired this mod actually.

    As for the the PH64 carbs, I haven't come across a set of those yet. Someone did a write up of XL carbs in this thread somewhere and I think those ones were from a California model.
  6. Carter Pewterschmidt

    Carter Pewterschmidt Long timer

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    That's basically what Davek posted, so that shows that the springs both of you measured are likely to be original springs. Thanks again!
  7. m2h

    m2h "Old guys rule"

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    Thanks dave Have got it sorted now. From what you said i had a bit of a brain fart!!!:evil Got the jets out and found the actual jet is screwed into the hex head part DUH!!!:huh As for the gaskets i'll have to have look at Babbits, havent used them before.
    Thanks again mate!
    M2H
  8. m2h

    m2h "Old guys rule"

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    Thanks Carter i think i have it sorted
    Cheers
    M2h
  9. RFVC600R

    RFVC600R SAND EATER

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    What weight oil did you use? I used 15w with new seals and I can blitz huge whoops as long as my legs dont get tired.
  10. ElMartillo

    ElMartillo I See Faces...

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    I had a quart of ATF sitting around, so that's what I used. Thrashed the bike good today as a shake-down, the front is like new, with the biggest improvement being the steering bearings. The old, loose, notchy ones made it feel like I was steering with both wheels! Should get my new front tire in mid-week, I hope to have the oil leaks buttoned up by then.

    This XL is a hot rod, and feels like a minibike compared to my 1150GS. What a blast!

    Cheers! :thumb
  11. RFVC600R

    RFVC600R SAND EATER

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    Hell yeah the XL is an amazing motorcycle. I've been climbing hills I never thought possible since I got the 13t sprocket. This damn bike will climb anything now.
  12. R. Smith

    R. Smith n00b

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    Here is my 1984 xl600r, bought it about 5 months ago w/18k miles. Has fresh oil and i loosened up the banjo bolt to be sure about oil getting to the head. Got it running and heard this coming from the engine. I may be wrong but the rattling does not sound normal. I took the engine apart to fix some stripped bolt holes and did not find any major wear or damage. It made this noise before and after I had the engine apart.

    Read that it could be a worn out cam chain or cam chain tensioner.

    Ideas?

    http://youtu.be/aUZS_dNEaPs
  13. davek181

    davek181 Long timer

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    I don't know for sure what they fit, they were eBay finds that went cheap enough for me to buy for parts. They are the style that has the fuel screw on the downwind side if the slide. My bike is a cali model that came to me with XR carbs and canister removed already.

    I hate to remove the carbs. I have evolved techniques to replace jets, slides, change needle position and jets and emulsion tubes etc. with the carbs in place. The only part yet that I could not do in frame was the decel diaphragm.

    I hope most of that is behind me now as I have finally gotten it dialed in as close as I think I can get it. I can adjust for seasonal changes with main jet swaps which are easy with the screw off bowls. :clap
  14. crobox

    crobox Been here awhile

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    I've been riding my newly rebuilt XL a bit over the last week or so, as the weather has been a bit nicer around here.

    One thing I've noticed is a fair bit of "coughing", or extremely short intervals of power loss, frequently during cruising at a constant speed/engine RPM. Usually stops happening if I open the throttle, although it sometimes continues to happen during the very first bit of throttle opening.

    I am thinking this may be a result of too-lean jetting. Does that make sense? The carbs were thoroughly cleaned as part of the rebuild, so I don't think it's a result of general carb dirtiness or clogged orifices.

    Thanks,
    Christian
  15. crobox

    crobox Been here awhile

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    As a reminder:

    I have the stock jets, but I'm up at 7000 ft. altitude.

    Thanks!
  16. doc.heckle

    doc.heckle Adventurer

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    Mr smith, sounds like tappets are a little loose to me

    Tim
  17. R. Smith

    R. Smith n00b

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    Checked the tappets, they are torqued down. Sounds like valves need adjustment but I just set them at specs.
  18. Carter Pewterschmidt

    Carter Pewterschmidt Long timer

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    Your pilot jet is probably lean. What size one were you running?
  19. davek181

    davek181 Long timer

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    Generally if it is surging a little, that is a sign of leanness. What jets are you running exactly? 7K elevation is roughly equivalent to one notch richer on the jetting from my experiences.

    These were lean to start with at best. Easy enough to pop the bowls and look. Can be done on the bike with a short screwdriver or bit in an offset driver.
  20. crobox

    crobox Been here awhile

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    Not sure of the sizes off the top of my head, but I remember noticing that they were the sizes that everyone said were "stock".

    Back when I was rebuilding this bike 6 weeks ago, I was reading this thread every day and those numbers were fresh in my head, which they are not now.

    CR