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Old 09-29-2012, 11:00 AM   #69661
motolab
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Quote:
Originally Posted by procycle View Post
Are you saying that one of these other needles can be used with a modified airbox and give better performance than the DJ needle?
I have been saying that all along.
Quote:
Nobody I know of who has tried this has been successful.
What are their qualifications, what equipment did they use, and what does "tried" encompass?

Regards,

Derek
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Old 09-29-2012, 11:35 AM   #69662
Mongle
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Quote:
Originally Posted by motolab View Post
I have been saying that all along.What are their qualifications, what equipment did they use, and what does "tried" encompass?

Regards,

Derek
Moto,

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.

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.

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

.

Mongle screwed with this post 09-29-2012 at 12:20 PM
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Old 09-29-2012, 01:38 PM   #69663
Load Clear
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Fuel question

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.
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Old 09-29-2012, 01:56 PM   #69664
motolab
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Quote:
Originally Posted by Load Clear View Post
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.
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

motolab screwed with this post 09-29-2012 at 07:06 PM
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Old 09-29-2012, 02:18 PM   #69665
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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.
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Old 09-29-2012, 03:14 PM   #69666
Adv Grifter
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Originally Posted by BergDonk View Post
Pull the horn off and test it direct to a battery with some jumper wires.

Mine died one day too, so got another from the wrecker. Dunno what it originated from, but it still works. I've heard that a few others have just dies too.
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!

Adv Grifter screwed with this post 09-29-2012 at 03:24 PM
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Old 09-29-2012, 03:19 PM   #69667
Adv Grifter
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Quote:
Originally Posted by freestate View Post
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.
That is great news!
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! )

Cheers!
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Old 09-29-2012, 04:32 PM   #69668
ADV8
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Quote:
Originally Posted by procycle View Post
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.
Quote:
Originally Posted by motolab View Post
I have been saying that all along.What are their qualifications, what equipment did they use, and what does "tried" encompass?

Regards,

Derek
Link to that needle spec please.
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Old 09-29-2012, 05:35 PM   #69669
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Quote:
Originally Posted by ADV8 View Post
Link to that needle spec please.
Derek says that the first thee needles in this diagram will work better with an open airbox than the DJ needle.
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Old 09-29-2012, 06:01 PM   #69670
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Quote:
Originally Posted by procycle View Post
Derek says that the first thee needles in this diagram will work better with an open airbox than the DJ needle.
Square inches???
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Old 09-29-2012, 06:08 PM   #69671
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Originally Posted by Andyinhilo View Post
Square inches???
Cross sectional area. One way to compare fuel flow between the needles at certain needle positions.
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DR900 Big Bore Stroker buildup
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Old 09-29-2012, 06:29 PM   #69672
sandwash
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I lost a seat bolt(one of the rear ones).I can figure it out but does anyone know the bolt size?
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Old 09-29-2012, 06:30 PM   #69673
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M8 / 1.25 mm pitch.
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Old 09-29-2012, 07:05 PM   #69674
motolab
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Quote:
Originally Posted by procycle View Post
Derek says that the first thee needles in this diagram will work better with an open airbox than the DJ needle.
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:



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
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Old 09-29-2012, 07:08 PM   #69675
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M8 / 1.25 mm pitch.
Thanks Now I can do the easy way.
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