I recently sold my 04 DS650 to get a Predator so that it is a little more track friendly and nimble. I loved my DS and its raw power, but needed somthing smaller and more manuverable. While I owned my DS I frequently came here to get info on how to set it up, dial it in, mantain it, or for general talk with other DS riders. Since then I have purchased an 04 Z400 for my wife, a few dirtbikes for my kids, and now the Pred for me. Not being snobbish, but I figured I'd end up hanging out in the Suzuki, or Polaris forums instead of here. Yet any time I need good, sound advice I end up here again. It doesn't seem to matter which quad or bike I'm talking about the guys here seem to have better knowledge about it. I don't know if that says that may of you had other quads and then moved to the DS, or if DS riders have more quad/bike knowledge as a group, but regardless I appreciate all the help I have (and hopefully will rececive) here. So to all of you that have helped me out I just want to say thank you, and compliment you on your helping nature as well as your overall knowledge.
With this said, I intend to stay here no matter which quad/bike I own or ride at a given time.

At this point I again need to put your minds to work. On my wife's 04 Z400 I just installed a full HMF sport exhaust, Uni filter, no airbox lid. the guys from HMF said I need to change the main from a 130 to anywhere from 132.50-145 and leave everything else alone. I tried the 140 and it didn't even want to idle, but would if I kept the choke on. I am at 58 feet above sea level and would really appreciate any help you guys can offer. I was wondering if anyone has a similar setup and could point me in the right direction or if anyone has a full jet kit that has instructions that would tell me what main, needle clip (aftermarket needle of course) and which pilot, and fuel screw setting for my situation. I assume it would be the stage 3 setup since I have no airbox lid and the full pipe with the Uni filter, but would be glad to heat what some of you think. I appreciate the help.

Cain

 

On my dad's Z400 I added the yoshi slip on and the billet air filter mount so I could run a K&N without the air box lid. I used a dyno jet kit and followed the stage 2 instructions exactly. The jetting is right on and I ride from sea level to 5k feet.

Instead of the dyno jet kit you can use the OEM needles and jets along with the fuel screw adjustment to get it spot on.

Here is a link to the Dyno jet instructions that worked great for me. Dyno Jet pdf

 

I too use to have a ds650 and wound up trading it for a banshee in a deal I couldn't refuse. I miss the old ds. Maybe someday I'll be in a position to get another. I've goten alot of great info and tips from this bomb board. Real knowlagable people here, and not just ds knowlage. The yamaha board is useless on this site.

 

I put the WB e-series pipe and same K&N you have on my wifes 400 and I ended up with a Mikuni 148 main, dynajet needle with the clip in center position and it runs perfect. I had to buy the Mikuni jet from the dealer because the largest jet in the dynajet kit was a 155 which equils ~142 Mikuni (they are not the same!!!!). I noticed that the Dynajet kit now comes with jets up to 165 so this could be an asset when dialing it in plus it has an adjustable needle.
The 400 is very sensitive to jet changes and needs to be spot on to run even decent. On my wifes, a 150 Mik ran rich and lost some power and the 155 d/j stumbled during wide open throttle runs.
After jetting a few of these things I found that the W/B e-series and the Sparks pipes require a larger jet then many of the other pipes (including the Yosh), and the K&N flows better then the Uni or the stock element. Not sure about the HMF, never jetted for one but I would start with the Dynajet 150 and do some wide open - top gear runs. It should have no problem powering up to the rev limiter in 4th and will even hit it in 5th but it takes time. If it loses power wide open but comes back when cracked back to 3/4 throttle you are lean. If it never reaches the rev limiter in 4th, its rich.
While you are in there, check your pilot jet for a clog, this could be why it wont idle. Or turn the pilot screw out 3-1/2 turns if you havn't already done so. Main jet has almost nothing to do with idle.

I wrote this in a hury cuz I have to go home so I hope it makes sense and helps you out some.

 

Here is a link to Alba's site showing the Z400 carb setups for pipes.

Notice the pilot jet changes in size. 22.5 looks stock and the 25 is what some require. Sounds to me like your lean at idle. With no lid especialy. Just for kicks, try it out with the lid on, see if it fixes it more makes it better. ultimately do it right and get the bigger pilot jet.

 

Thanks for all the help guys. Good thing I owned a Bomb first or I'd be in trouble without all the info I get here.
Cain

 

That is a good point depending on the pipe you have. If you keep scrolling down the page it says that if you have their "new style pipe" you stay with the stock pilot. Point here is that all pipes are different and will require different jetting.
The rule of thumb on the pilot jet is: If you can turn the pilot screw out far enough to create a rich idle, the pilot jet is not necessary. You don't want it running rich at idle but you do want it to start easy with the choke when cold and start without the choke when the engine is warm.
If you have cold start problems that can not be cured by opening your pilot screw and you are sure that your pilot jet is not clogged, a larger pilot jet will be necessary.
I've been able to get proper adjustment without going bigger on the pilot jet....so far

 

If it runs better with the chocke, I would def say you need more fuel at idle (try air or fuel screw, but most likely you need to bump the pilot) You can try the airbox lid on/off deal as well, but it will probably have the same results as the choke on/off.

 

Cain, sorry to hers you sold the ds, but good choice on the pred. It deff sounds like the carb is a little to lean. I would put the biggest mainjet in that you have and go down from there, and I agree with the pilot jetting as well, if the pilot isn't big enough put a larger one in. But I can't hardly imagine that the pilot would need changed. I have not changed the pilot on any of my quads and have no troubles. Well good luck, RUSS

 

He is 58ft above sea level without the lid on. 2 BIG changes from the factory settings, then a pipe! So he has increased air in a MAJOR way. The 58ft is different from most people on the forums. I can say from real experience playing in different altitudes, when I go up in altitude my DS will cough a little bit. When I pull the lid off, its perfect. I gave it more air, because there is less as you go up, you have to give it more air.

His comment: I tried the 140 and it didn't even want to idle, but would if I kept the choke on.

The choke cuts off the air, so there you go, back into a temporary ballance.


Now that I have a TM45 on my DS, I never use a lid. I also have a custom air/battery box now. You can dial in your carb, just know that the pilot is for idle, the needle is for mid range throttle, and the Main Jet is for wide open throttle. Thats the basics, yes some will play on eatchother.