Hi OMR
The carb had a stock needle and 165 main jet. I purchased a DJ kit and changed to a DJ needle on second groove, and main jet to a 175.
Pilot two full turns.
I also drilled out the two existing holes on the slider thing and didn't dare the other two yet.
I did all the airbox mods with lid on, I ran the tubes into the box.
As far as the spring I will just order a 2005.

I have a K&N air filter and an end cap with repacked baffle.
I haven't fired it up yet since I am in the middle of a major overhaul.
Does the jetting sound about right to you? I am at around 1000-1100ft

Thanks.

You must drill the extra 2 vacuum ports to really note a major change.
You just have to be careful and take your time. After you pilot a 1/16 drill, look from the back side for alignment. If not centered, just reinstall the 1/16 drill and side drill to the best location. Now with best location, drill with a 1/8.

If you totally goofed up, buy some JB Weld and plug hole. Let dry 1 day and then start again.

Jetting, for winter, 180-185 DJ main, summer a 175. This with stock CDI and endcap.
Pilot screw out 3 turns winter and 2 1/2 summer. This with 40-45 jet and stock cdi.

OMR

Thanks for the info. OMR.

I will try the other two hole this weekend, Change my jetting, and check what size the pilot jet is.
If I got a high performance CDI such as a Big gun, or Ron Woods, How would that affect the jetting?

Thanks again.

The RW cdi has no rev limiter and is a race only application. Very aggressive timing. 32 degrees.

I like the new Big Gun. Timing is 28 degrees with a rev limiter around 8500 to 8700 rpm.
This is 2 degrees over stock and good for 2hp.

Jetting with Big Gun is up one in main and raise the needle from 2nd to 3rd groove.

OMR

Hey Omr

I have a buddy that has a Predator, would his bike also benfit from the carb mods as well. I still have my stock carb so I can practice on it first.

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2000 DS650 w/Big Gun Exhaust 46HV Lectron, K&N w/Outerwear, Woods Box, 730 HPR Big Bore, Trail Ported Head,HPR4 Cams, Shim Under Bucket, Reverse Cut Tranny Gears, UPP upper Chain Roller, 22-11.00x10 9 Paddle Extreams, Alba Rad Scopes, Battery Cover, IMS Pegs and Heel Guards.

MRDS650,

I would do all the mods for the Predator. They usually run an open airbox or bolt on filter. Thus you have to change the air jet to have the best curve. I do not know what the difference is in the taper of the dj needle, for predator, to stock is. I will send an email to DJ and see if they will share that information.

I posted my summary on the Predator Owners forum and after 2 weeks got not one person asked for help. Thus I killed the posting. I guess Doug Nickolas has that forum believing that he is the only person that knows anything about carbs. I tried to get Doug to share data between eachother and he blew me off. A few years ago he raced a couple of times in wisconsin and when we talked, he would not talk much to me because I was not a polaris owner and like most times, young people do not like to talk to older people. He has been successfull and you would of thought he would want some DS business, but I guess he is so busy and now under contract to polaris.

The atv group in general is a some number and it is ashame we do not try to help each other to enhance our hobby.

OMR

OMR,

Do you think the Nicholas Cycle carb mods are similar to your mods?? I have a buddy with a Preddy that sent Doug his carb for this service, but he really doesn't know what was actually done!

Thanks

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2000 DS 650<BR>K & N and No-Toil<BR>Ohtsu's<BR>22" Haulers for sand<BR>ODP Disc End Cap<BR>Mr. HP Ported Intake<BR>Barnett 9 disk clutch<BR>IMS Pegs/Heel Guards<BR>Oldman Racing carb Mod/TM45

OMR

I ordered my buddy the K&N pro intake kit just the other day because the predy has that stupid air filter design from the factory. I will be installing it in a month or so for him. I am going to make a point to do all your mods to the carb and I will let you know how it turns out. Might even be able to share some dytno results later this summer.

Thanks for your help



-------------------------
2000 DS650 w/Big Gun Exhaust 46HV Lectron, K&N w/Outerwear, Woods Box, 730 HPR Big Bore, Trail Ported Head,HPR4 Cams, Shim Under Bucket, Reverse Cut Tranny Gears, UPP upper Chain Roller, 22-11.00x10 9 Paddle Extreams, Alba Rad Scopes, Battery Cover, IMS Pegs and Heel Guards.

Dingo2,

Other than he taper ports the inlet side of the carb, I do not know what he does internally. He gets $200 for reworking the carb and I do not know of anyone who actually knows what he changes.

The Predator and the DS650 use the same needle from DJ. The assortment of main jets is all that is different.

OMR

OMG!!! This mod works better than I could have imagined. I went to the local hardware store with a stock snorkle tube in hand and a head full of doubts about asking for some "sump pump hose" so I wandered around the store meandering into the plumbing section. Looked high and low then a plastic bag caught my eye up on the top shelf...YUP...$12.99 and enough to do 4 quads. The kicker is that it's all one piece but separated every so often by a smooth section with a division ring where you cut--NO Guesswork! Followed OMR's instructions, put in a DJ needle in that came out of my '01 a couple years ago, put a DJ 180, and actually didn't like the idea of loosing the clear tube and putting a filter on the port at the carb so I just reinstalled as stock. I reused a portion of the stock tubes to get the air to the back of the airbox as well...adjusted the floats...checked my air/fuel mixture screw and fired her up! This was done on my wife's '05 and what a blast! Wheelies are a piece of cake 1st thru 3rd...4th and 5th are a can do as well with a little clutch and throttle action. The little motocross track at the lake here is a blast now as well. It's amazing how much more control is gained with crisp throttle response and the ability to loft the front end at will--it feels like shedding 50-75lbs........................................if you're still at the bolt on stage of the game running the stock carb and don't do this mod by the weekend you're missing the boat!!! Drilling the slide was a breeze...look at the bottom and think of rolling a 5 on a dice...clean up the plastic shavings...grind the lowest washer on the needle into a "D"...least-expensive greatest-gain mod I've ever done! THANKS a 1000000, OMR!!!

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Mine '01 DS650; Daughter's '03 DS650; Wife's '05 DS650
'01 F-250 PSD 4X4
Glock 22, three ankle biters and lots of land mines!

you think you guys could post some pics of these mods??? would really love to see them in some detail so i can put it together in my mind...... thanks and would be greatly apprciated

Steven Smith

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01 DS650


Release the Twins Foundation Member # 1

I did this last night and it actually only took me about a half hour to get it out, work on it, and back runnin...I thought I would be confused but it went very easy...I rode all day today and it was running well...I have an 04 and the spring was already the correct length....I still need to do the intake snorkel mods yet...This diagram may help a little...http://www.nightrider.com/biketech/hd_cv_mods.htm...It is for a harley but it is basically the same carb.

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2004 DS 650<BR>RW pipe, CDI, Intake, Clutch Springs, and a TM 48 w/ a KnN off of it.

OMR,

I have a question, What is the jet in front of the main jet's purpose? Also, could you give some more detail about your modified emulsion tube? OK two questions.

Thanks,

Ben

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06 DS 650 X<BR>K&N<BR>OMR Carb Mods<BR>Ported intake<BR>MR HP endcap

OMR, I live about 60 miles from you. I am by no means a carb guy. What would you charge me to do mine if I drop it off at your door?

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Ride it like it's insured!

Quote

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Originally posted by: stsmith27
you think you guys could post some pics of these mods??? would really love to see them in some detail so i can put it together in my mind...... thanks and would be greatly apprciated

Steven Smith

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I have done the Mod and love the low and mid range .Top has suffered though . I ride at glamis and I will run out of power when I am climbing a big dune.
Next trip I am going to drop a tooth in the front ,replace the air bleed jet with a .40 that I received from Rob performance re-jet and run it with lid off.

There are some pix of the mods in my gallery

I read somewhere in here that the boot between the carb and the air box colapses so i checked it out and mine colapses some so im sure that its restricting air. I am about to do the snorkle mods and will order a dj jet kit soon as i can will this stop the colapse or is there a way to beef up the boot so it dont colapse?

I am runnig a stock CDI with the needle set in 2nd from top groove, it has a 175 main jet and a 40 air jet.I have a white bros. e siries pipe and K&N filter when i got this bike it had a ron woods CDI but it was burnt and I didnt realize what it was at the time so i got a stock CDI and when i installed it i had to let the needle down from the third grove. I am good on take off and spitting and sputting in mid and pretty good at hi except for the rev limit.
can anyone help me here?

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01 DS650


Release the Twins Foundation Member # 1

Edited: 03/06/2007 at 07:10 PM by stsmith27

Just buy a new one...or look for a newer one in the garage thread...I think in 04 they became reinforced so they wouldn't colapse

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2004 DS 650<BR>RW pipe, CDI, Intake, Clutch Springs, and a TM 48 w/ a KnN off of it.

I have a 2005-6 DS 650 baja x with about ten hours on it and am getting ready to install a few upgrades.
1: Big Gun full evo x full exhaust or Yosh rs 3 slip on.
2: Big gun cdi
3: K&N
4: dyno jet kit.

I am also ordering a 15 tooth front sproket just incase.
I run at sea leval most of the time on the dunes. I have been running with 22 inch sandstars on the rear.
I am thinking about the carb mods with the air box on, or should I go air box off? Would there be any other suggestions?

Thank you

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2005 DS 650X Baja
Big Gun Exhaust
Big Gun Rev Box
Dyno Jet Kit
Leager Steering stem +2
Flex Bars
AC Nerfs with heel guards
22" Sand Star paddles

Edited: 03/10/2007 at 01:14 AM by RMAT56

Hey omr or anyone else in here I posted this and need some help to clarify when you use these screw or jets or not at all and when you say turn the pilot you don't mean the pilot jet in the carb correct and here is what I posted as a thread.
I just need some help clarifying some of the purposes of the jets and screws on the carb thanks...I know what the main jet, pilot jet, and needle do, but need some help on the others...In the mouth of the carb there is a pilot jet that my book says is a 110 and is on the left side when you are looking into the carb, but what is its purpose and do you use it to tune...also on the right side my book says there is a jet 120 and what does that do etc...and then there is the adjuster screw...I was also told to turn the pilot jet out,but learned I was wrong about that so when a manufacturer of say an exhuast company says turn say 2 turns out which screw do you turn...If anyone can clarify these jets I would appreciate it thanks and I am talking about the carb on the ds650...I just want to clarify so I don't have any more confusion on adjusting carbs and so I know what everything does...Can someone teach me how to tune a carb the right way...Thanks

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2002 Suzuki Ozark(sold) 2001 Bombardier ds 650(sold) 2007 Honda 450r

bombrider04,

I'm no carb expert by any stretch but I do know that the only "adustable" jet is at the very bottom of the carb nearest the engine. There is an open hole on the bottom of your carb and it takes a medium-small flat screwdriver. This is the one you adjust (discounting the idle adjustment knob) while the engine is running...screw it in/righty/clockwise closes the orifice and lefty/counterclockwise opens it up. You are supposed to close it while the engine is running until the engine stumbles and then open it until the engine stumbles and then put it between those two points and rejet the main or adjust your needle if you get no stumble which will require more research as to what that means. This is your air adjustment screw, I believe, and it is the one that the pipe companies suggest you turn out two turns. Basically that means take it all the way to seat and then screw out two full turns...hope that helps a little.

Jim

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Mine '01 DS650; Daughter's '03 DS650; Wife's '05 DS650
'01 F-250 PSD 4X4
Glock 22, three ankle biters and lots of land mines!