XR650R Thread!

Discussion in 'Thumpers' started by JustinT, Nov 24, 2008.

  1. jesusgatos

    jesusgatos fishing with dynamite

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    Thanks for the reply. We're running almost exactly the same gearing, and I'd guess that's about how much oil it's consuming. No big deal, but doesn't that seem excessive? I mean, what is it about these engines that they gobble-up oil?
  2. Blakebird

    Blakebird r-u-n-n-o-f-t

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    By using that criteria, the XR600R was a race engine too? It was also a successful Baja racebike, and the 650R is essentially a liquid cooled version of a similar format (without RFVC).

    Yet the GB500, NX650/Dominator, XR650L, etc all used the same basic engine. There were differences in tuning, but the basics were the same - and the GB500 WAS design as a streetgoing machine - and I'll be 80% of the XR650L's out there are used on pavement more than offroad.
  3. Purcell69

    Purcell69 Mors ex Tenebris

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    Since I have never seen smoke to indicate actual oil burning, I would guess it is more closely related to oil vapor being drawn from the crank case. Sure, compared to the XRL I had, it seems excessive, but then a whack of the throttle reminds me why I am not that overly concerned about the extra usage. That's saying a lot for me. I tend to be meticulous about such things, so it was a bit hard for me to "let go" over the whole issue. No smoke at the pipe and no gunk on the plug, guess I'll add a little more and call it good.

    -Joe
  4. Shibby!

    Shibby! Long timer

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    It can be called whatever we want it to be called. I guess I'm the only one who doesn't expect this engine to last forever without issues. I'm fine with that. I'm on the mindset that it wasn't designed to drone for 1000's of miles on end without problems, and so I don't expect it to.

    I don't even know what's being talked about anymore.

    I'd sooner read about interesting things or important stuff rather then ramblings about how durable a thumper can be and what kind of mileage to expect from it. It's been covered before. (search for XRR and mileage)

    So with that said, I'll drop the subject so we can return back to our normal programing of quality XRR talk/reading.
  5. Ironwood

    Ironwood Friday Harbor, WA

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    If it is burning oil why don't you try out some different brands of quality oil and see if that makes a difference?

    Should see some stay in there better than others.

    Joe
  6. Purcell69

    Purcell69 Mors ex Tenebris

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    That may well be the case, but I just don't see it as being that critical from my perspective. The sceduled maintenance calls for 600 mile oil changes. Since I am mostly riding on the street, I change my oil at 1,000 miles. I don't really start seeing a loss until I am into the last half of the 1,000, so topping it off once or twice before the next change isn't all that bad in my book.

    -Joe
  7. BHW

    BHW Long timer

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    I wouldn't call the XR650R engine a "race engine". It's nowhere near as maintenance intensive as a current 450cc race engine. It's a low compression, low RPM engine comparatively.
  8. Blakebird

    Blakebird r-u-n-n-o-f-t

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    I change the oil frequently enough, that if it did go through a bit of oil - it gets topped off with a fresh new supply before it could become an issue.

    Lots of pavement miles puts you in the realm of checking it like you would a street bike - less often. In the dirt my oil gets looked at virtually every time I take it out.... if I were commuting on it, that inspection would probably get lax and normal consumption would seem to be exaggerated.

    For peace of mind, if I were riding that many pavement miles....I would just change the oil often, and the filter every other oil change. Then you could rest a bit easier.
  9. Max Power

    Max Power Secret Agent

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    Agreed.
    [​IMG]
  10. Capt. Egregious

    Capt. Egregious Been here awhile

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    My experience with big singles is they all use oil when spun up. Big lung creates more crank case pressure at higher RPMs which makes the rings and valve seals job harder. The whole reason I got a XRR was because it was built to last with a relaxed maintenance schedule. No "racemotor" maintenance/rebuild schedule for me.
  11. RallyMoto

    RallyMoto Been here awhile

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    Before I ran a bunch of mud through the motor (not-so-fun story), I was commuting 100+ miles per day on pavement at 80mph. I was changing the oil roughly every 1,000 miles and checking it every fill-up. I had almost no oil consumption over the 1k miles between oil changes, as in I didn't ever need to add any. Here's the rebuild ready to go in: HRC Copy cam (XR's Only), Kibblewhite valves with 3-angle grind, new stock piston and rings, newly re-nikasil'd cylinder and a brand new TM-40 :D. Can't wait to see how she runs. Also doing all the bearings. Hopefully get it all back together this weekend.

    [​IMG]

    [​IMG]
  12. KASUYAHO

    KASUYAHO Road Hog

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    Why do you think the BRP engine is not a race engine?

    Why do you think the CRF are a race engine?
  13. KASUYAHO

    KASUYAHO Road Hog

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    There is a mob in Australia Joe,
    He does all the Rallye bikes, GHR 650R's etc.

    He did my bike,
    200 watt stator, you can get 140 watt stator, 100 watt headlight,
    run GPS, install battery's HID's etc

    Google Bettabikes, there in South Aussie
  14. xr400r

    xr400r Long timer

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    I believe that any engine could be considered a race engine if it is in something that you race
  15. header

    header Chris

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    Thats the way I see it also. What bike made ever had an engine for commuting? A BMW 650 Dakar? Hell that still has been raced a bit.

    In offroad situations the engine doesn't make a race bike, suspension and handling do. Plus the XRR was designed for a race that demanded a rediculous amount of give in terms of durability.

    Just because you don't need to work on it all the time doesn't mean its not high performance. It just seems that way when compared to the 450 motocross bikes that are beating themselves to death trying to match performance with a two storke.

    :dunno

    <sub>I told myself not to get involved in this and here I go..</sub>
  16. Shibby!

    Shibby! Long timer

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    And to that I agree. Looks like I started something rediculous that won't stop..


    So.. Does everybody here think the DRZ/DR/XR/F650, etc engines are equally as reliable, or more-so then then the XRR? Aside from any known issues that were design faults.

    IMO, when performance is pushed from an engine (more HP, more torque, and engine characteristic), then it becomes a performance/race engine. With performance comes reliability issues. It may not be linear, but there are things given up when starting to push the envelope.

    Sure the 450's are putting out more performance/displacement at a reduced service and reliablity limit, but at the same time they are newer technology, and designed for MX, or at least based off MX engines. These engines were originally designed to compete with 2-strokes. High RPM, high powered bikes at minimal weight. They want big power up top, and in between it's not so important.

    IMO, real life requires a broad powerband. Power throughout the RPM range is ideal. I believe thats what they had in mind with the XRR. Why have WOT power when you could sacrifice the top end power slightly but have a more thorough power delivery throughout the rev range.

    I'm sure we'll see lots of different opinions, but I'm sure there are good arguements on both sides. I just don't think Honda has a lazy mill on it's mind when designing and building the XRR. They wanted a competitive baseline to produce their race bikes. We have to keep in mind this was done in the later 90's as opposed to the 450's which are being deleloped every year to push the envelope.

    At the end of the day, Honda still recommends a 600km?/mile? service. That's not great by any means. It may not need it, but 450's don't need the 10hr oil change either in some people's minds. Sure their top ends wear out, but also, not requiring the rebuilds as often as they state either.

    Lets hear the arguements :ear
  17. jules083

    jules083 Long timer

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    I have a real stupid tire question. I've been reading this thread and my eyes are about crossed.

    What tires and sizes are you guys running? I was going to run the Dunlop 606's, but now I'm not finding the proper size. The closest size I found is a 120/90-18. Is that the one that works, and still lets you gear the bike how you want? Thanks for any and all help.
  18. Blakebird

    Blakebird r-u-n-n-o-f-t

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    The D606 doesn't come in many sizes....but yes, the 18" rear you mention works well. I've run a number of those on my XR600's and 628.
    IMO the D908RR is too big for this bike, but many probably use it and like it.

    I needed my bike inspected for compliance before getting it plated, so I needed DOT tires....and found a great price on the Bridgestone Gritty ED03/ED04. The rear, for it's nominal size - looks small, but it works quite well so far. It hasn't been anywhere near the variety of terrain the D606's have seen yet - it is winter in Colorado after all :D

    I liked the Maxxis Desert on the XR628, which spent 95% of it's time offroad. I will probably go back to the Maxxis before my next Baja trip.

    As far as DOT tires go though, the D606 is probably my favorite....and that could be because I find them cheap often enough that I haven't tried the MT21 yet :lol2
  19. zaptoad

    zaptoad just a guy

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    I stick with these on my plated bikes, in case I get checked.
    130/90 rear D606 on my XRR
    140/80 rear D908 on my 950adv
    90/90frts on both, mounted backwards hoping to limit cupping

    FWIW.
  20. BikePilot

    BikePilot Long timer

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    I ran V2R and did ~1200 miles in baja on a 120 606 - worked just fine. It does allow you to run the axle all the way forward in the swinger without issue. A 130 may as well, I'm not sure.