the DR650 thread

Discussion in 'Thumpers' started by sleepywombat, May 1, 2006.

  1. motolab

    motolab Long timer

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    You are in fact missing the point. The DJ needle provides richness at the bottom/lower middle/leanness up top (in terms of rpm) - the exact opposite of the trend that is required to get uniform mixture when modifying the airbox.
    Agreed.
    Based on the shape, and the trends that shape represents, it is the worst choice of the ones discussed so far.
    Sure it does. Any needle that exhibits a trend going in the correct direction, that is one that, based on its shape, will provide a comparatively leaner mixture at the bottom/lower middle/richens up top (in terms of rpm), and is adjustable. That includes the FP needle (out in my opinion because it is likely to cause accelerated emulsion tube wear), both non-USA OEM needles, and the KTM needle.

    Regards,

    Derek
  2. procycle

    procycle Long timer

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    Are you saying that one of these other needles can be used with a modified airbox and give better performance than the DJ needle? Nobody I know of who has tried this has been successful.
  3. motolab

    motolab Long timer

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    I have been saying that all along.
    What are their qualifications, what equipment did they use, and what does "tried" encompass?

    Regards,

    Derek
  4. Mongle

    Mongle Knuckle dragger

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    Moto,<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:eek:ffice:eek:ffice" /><o:p></o:p>
    <o:p></o:p>
    You help a lot of people on here and I think you have a lot of valuable knowledge. BUT, you come off a little rough. You have the "my way is the only way" attitude which isn't always right. <o:p></o:p>
    <o:p></o:p>
    Owning my own dyno (one that handles up to 2000 hp and 1600 ft lbs of torque) and done custom tunes on fuel injection and carbs I know a lot of stuff like your CO2 analyzer are NOT the only way to tune an engine. If I can tune a fuel injection 630 inch blown boat motor without it I know a 35hp motorcycle motor can. Also, you spout off asking people stuff wanting answers they probably can't provide just to make your "ideas" look better.<o:p></o:p>
    <o:p></o:p>
    You still haven't ever answered my questions on what BSFC #/HrHP and Fuel F #/HR you are getting on the DR for max power. If you can't provide that...well, YOU don't have all the information<o:p></o:p>
    <o:p> </o:p>
    .
  5. Load Clear

    Load Clear Adventurer

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    Hi all:
    Looking for some education.

    I mentioned a while back that I get crappy gas mileage on my 2012 (41-43 mpg).

    Tinkerinwstuff mentioned ethanol as the culprit. When I asked the dealer mechanic he suggested the same.

    Anyway - I put in some startron enzyme treatment. Now the bike seems to need more throttle in first gear to keep from stalling. I had always thought the bike needed the choke left on for too long (maybe about a minute) but now it's even longer or the bike stalls.

    Hoping someone can explain what is occurring - is this "lean" vs "rich"? Should I be using this startron stuff? The first tank did not seem to help the mpg.

    Thanks.
  6. motolab

    motolab Long timer

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    The need to leave the cold start enrichment (technically BST40 carbs do not have chokes) active longer points to a lean problem. It sounds like the pilot jet may be getting some deposits in it.

    Regards,

    Derek
  7. freestate

    freestate Adventurer

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    Thanks ADV Grifter and the rest of you that came with suggestions regarding my feared gearbox failure. Internet was sparce but I'm now back at home. Turns out you guys were right. I need a new chain and front sprocket.
    Cheers.
  8. Adv Grifter

    Adv Grifter on the road o'dreams

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    My stock horn died too, as well as a single horn Fiamm. Never get water in those Fiamm horns. In addition to that, I've lost two horns when riding off road. Bracket broke off. So take care with the mounting bracket ... no matter what horn you go with. I'm now using another random disc type that is actually pretty LOUD. It fits in the standard location, I've upgraded the bar stock and mount to avoid the work hardening break that's happened twice before.

    For a Super Horn you will be best with a relay. More wiring but MUCH better sound. No idea where you put a horn with a Safari tank. Mine barely fits with my IMS tank.
    Best!
  9. Adv Grifter

    Adv Grifter on the road o'dreams

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    That is great news! :clap:clap
    I think you must own the only DR650 in Scandinavia ! I Hope your bike treats you well ... Get out and ride before Winter! Not much time left!
    (or come to California ... where our riding season ... never stops! :deal )

    Cheers! :beer
  10. ADV8

    ADV8 Taumarunui..Darwin..

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    Link to that needle spec please.
  11. procycle

    procycle Long timer

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    Derek says that the first thee needles in this diagram will work better with an open airbox than the DJ needle.
    [​IMG]
  12. Andyinhilo

    Andyinhilo Long timer

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    Square inches???
  13. procycle

    procycle Long timer

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    Cross sectional area. One way to compare fuel flow between the needles at certain needle positions.
  14. sandwash

    sandwash Long timer

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    I lost a seat bolt:baldy(one of the rear ones).I can figure it out but does anyone know the bolt size?
  15. ADV8

    ADV8 Taumarunui..Darwin..

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    M8 / 1.25 mm pitch.
  16. motolab

    motolab Long timer

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    Note that the areas given are not the needle cross-sectional areas, but the area calculated to be exposed at the outlet of the emulsion tube. Also note that this diagram is from IdahoJim over at Thumpertalk.

    Here are diameter measurements taken by mx_rob:

    [​IMG]

    Here are the corresponding measurements for other adjustable BST40 needles:

    '96-'12 Non-USA OEM DR650: 10mm: 3.00mm, 20mm: 2.97mm, 30mm: 2.70mm, 40mm: 2.43mm, 50mm: 2.19mm 59mm: 1.97mm
    '92-'95 Non-USA OEM DR650: 10mm: 3.00mm, 20mm: 2.94mm, 30mm: 2.63mm, 40mm: 2.30mm, 50mm: 1.94mm, 59mm: 1.63mm
    '95-'02 Aprilia Moto 6.5: 10mm: 3.00mm, 20mm: 2.94mm, 30mm: 2.52mm, 40mm: 1.99mm, 50mm: 1.53mm, 59mm: 1.23mm

    Based on these measurements the first needle I would try with an open airbox would be the '96-'12 Non-USA OEM, followed by the KTM.

    Regards,

    Derek
  17. sandwash

    sandwash Long timer

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    Thanks:clap Now I can do the easy way.
  18. sandwash

    sandwash Long timer

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    MX Rob did a needle comparison,need to do a search over at TT to find it though.
  19. 805gregg

    805gregg Long timer

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    Worked perfect on my '96
  20. greener556

    greener556 Been here awhile

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    I'll be putting a jet kit in, opening up the air box and hopefully getting some new exhaust this winter.

    You guys keep talking about drilling the slide? Any pictures or write ups anywhere?